granicus.if.org Git - imagemagick/blob - MagickWand/compare.c

   1 /*
   2 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
   3 %                                                                             %
   4 %                                                                             %
   5 %                                                                             %
   6 %               CCCC   OOO   M   M  PPPP    AAA   RRRR    EEEEE               %
   7 %              C      O   O  MM MM  P   P  A   A  R   R   E                   %
   8 %              C      O   O  M M M  PPPP   AAAAA  RRRR    EEE                 %
   9 %              C      O   O  M   M  P      A   A  R R     E                   %
  10 %               CCCC   OOO   M   M  P      A   A  R  R    EEEEE               %
  11 %                                                                             %
  12 %                                                                             %
  13 %                         Image Comparison Methods                            %
  14 %                                                                             %
  15 %                              Software Design                                %
  16 %                                John Cristy                                  %
  17 %                               December 2003                                 %
  18 %                                                                             %
  19 %                                                                             %
  20 %  Copyright 1999-2013 ImageMagick Studio LLC, a non-profit organization      %
  21 %  dedicated to making software imaging solutions freely available.           %
  22 %                                                                             %
  23 %  You may not use this file except in compliance with the License.  You may  %
  24 %  obtain a copy of the License at                                            %
  25 %                                                                             %
  26 %    http://www.imagemagick.org/script/license.php                            %
  27 %                                                                             %
  28 %  Unless required by applicable law or agreed to in writing, software        %
  29 %  distributed under the License is distributed on an "AS IS" BASIS,          %
  30 %  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.   %
  31 %  See the License for the specific language governing permissions and        %
  32 %  limitations under the License.                                             %
  33 %                                                                             %
  34 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
  35 %
  36 %  Use the compare program to mathematically and visually annotate the
  37 %  difference between an image and its reconstruction.
  38 %
  39 */
  40 \f
  41 /*
  42   Include declarations.
  43 */
  44 #include "MagickWand/studio.h"
  45 #include "MagickWand/MagickWand.h"
  46 #include "MagickWand/mogrify-private.h"
  47 #include "MagickCore/string-private.h"
  48 \f
  49 /*
  50 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
  51 %                                                                             %
  52 %                                                                             %
  53 %                                                                             %
  54 %   C o m p a r e I m a g e C o m m a n d                                     %
  55 %                                                                             %
  56 %                                                                             %
  57 %                                                                             %
  58 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
  59 %
  60 %  CompareImagesCommand() compares two images and returns the difference between
  61 %  them as a distortion metric and as a new image visually annotating their
  62 %  differences.
  63 %
  64 %  The format of the CompareImagesCommand method is:
  65 %
  66 %      MagickBooleanType CompareImagesCommand(ImageInfo *image_info,int argc,
  67 %        char **argv,char **metadata,ExceptionInfo *exception)
  68 %
  69 %  A description of each parameter follows:
  70 %
  71 %    o image_info: the image info.
  72 %
  73 %    o argc: the number of elements in the argument vector.
  74 %
  75 %    o argv: A text array containing the command line arguments.
  76 %
  77 %    o metadata: any metadata is returned here.
  78 %
  79 %    o exception: return any errors or warnings in this structure.
  80 %
  81 */
  82
  83 static MagickBooleanType CompareUsage(void)
  84 {
  85   const char
  86     **p;
  87
  88   static const char
  89     *miscellaneous[]=
  90     {
  91       "-debug events        display copious debugging information",
  92       "-help                print program options",
  93       "-list type           print a list of supported option arguments",
  94       "-log format          format of debugging information",
  95       (char *) NULL
  96     },
  97     *settings[]=
  98     {
  99       "-alpha option        on, activate, off, deactivate, set, opaque, copy",
 100       "                     transparent, extract, background, or shape",
 101       "-authenticate password",
 102       "                     decipher image with this password",
 103       "-channel type        apply option to select image channels",
 104       "-colorspace type     alternate image colorspace",
 105       "-compose operator    set image composite operator",
 106       "-compress type       type of pixel compression when writing the image",
 107       "-decipher filename   convert cipher pixels to plain pixels",
 108       "-define format:option",
 109       "                     define one or more image format options",
 110       "-density geometry    horizontal and vertical density of the image",
 111       "-depth value         image depth",
 112       "-dissimilarity-threshold value",
 113       "                     maximum distortion for (sub)image match",
 114       "-encipher filename   convert plain pixels to cipher pixels",
 115       "-extract geometry    extract area from image",
 116       "-format \"string\"     output formatted image characteristics",
 117       "-fuzz distance       colors within this distance are considered equal",
 118       "-highlight-color color",
 119       "                     empasize pixel differences with this color",
 120       "-identify            identify the format and characteristics of the image",
 121       "-interlace type      type of image interlacing scheme",
 122       "-limit type value    pixel cache resource limit",
 123       "-lowlight-color color",
 124       "                     de-emphasize pixel differences with this color",
 125       "-metric type         measure differences between images with this metric",
 126       "-monitor             monitor progress",
 127       "-passphrase filename get the passphrase from this file",
 128       "-profile filename    add, delete, or apply an image profile",
 129       "-quality value       JPEG/MIFF/PNG compression level",
 130       "-quiet               suppress all warning messages",
 131       "-quantize colorspace reduce colors in this colorspace",
 132       "-regard-warnings     pay attention to warning messages",
 133       "-respect-parentheses settings remain in effect until parenthesis boundary",
 134       "-sampling-factor geometry",
 135       "                     horizontal and vertical sampling factor",
 136       "-seed value          seed a new sequence of pseudo-random numbers",
 137       "-set attribute value set an image attribute",
 138       "-quality value       JPEG/MIFF/PNG compression level",
 139       "-similarity-threshold value",
 140       "                     minimum distortion for (sub)image match",
 141       "-size geometry       width and height of image",
 142       "-subimage-search     search for subimage",
 143       "-transparent-color color",
 144       "                     transparent color",
 145       "-type type           image type",
 146       "-verbose             print detailed information about the image",
 147       "-version             print version information",
 148       "-virtual-pixel method",
 149       "                     virtual pixel access method",
 150       (char *) NULL
 151     };
 152
 153   ListMagickVersion(stdout);
 154   (void) printf("Usage: %s [options ...] image reconstruct difference\n",
 155     GetClientName());
 156   (void) printf("\nImage Settings:\n");
 157   for (p=settings; *p != (char *) NULL; p++)
 158     (void) printf("  %s\n",*p);
 159   (void) printf("\nMiscellaneous Options:\n");
 160   for (p=miscellaneous; *p != (char *) NULL; p++)
 161     (void) printf("  %s\n",*p);
 162   (void) printf(
 163     "\nBy default, the image format of 'file' is determined by its magic\n");
 164   (void) printf(
 165     "number.  To specify a particular image format, precede the filename\n");
 166   (void) printf(
 167     "with an image format name and a colon (i.e. ps:image) or specify the\n");
 168   (void) printf(
 169     "image type as the filename suffix (i.e. image.ps).  Specify 'file' as\n");
 170   (void) printf("'-' for standard input or output.\n");
 171   return(MagickFalse);
 172 }
 173
 174 WandExport MagickBooleanType CompareImagesCommand(ImageInfo *image_info,
 175   int argc,char **argv,char **metadata,ExceptionInfo *exception)
 176 {
 177 #define DefaultDissimilarityThreshold  0.31830988618379067154
 178 #define DefaultSimilarityThreshold  0.0
 179 #define DestroyCompare() \
 180 { \
 181   if (similarity_image != (Image *) NULL) \
 182     similarity_image=DestroyImageList(similarity_image); \
 183   if (difference_image != (Image *) NULL) \
 184     difference_image=DestroyImageList(difference_image); \
 185   DestroyImageStack(); \
 186   for (i=0; i < (ssize_t) argc; i++) \
 187     argv[i]=DestroyString(argv[i]); \
 188   argv=(char **) RelinquishMagickMemory(argv); \
 189 }
 190 #define ThrowCompareException(asperity,tag,option) \
 191 { \
 192   if (exception->severity < (asperity)) \
 193     (void) ThrowMagickException(exception,GetMagickModule(),asperity,tag, \
 194       "`%s'",option); \
 195   DestroyCompare(); \
 196   return(MagickFalse); \
 197 }
 198 #define ThrowCompareInvalidArgumentException(option,argument) \
 199 { \
 200   (void) ThrowMagickException(exception,GetMagickModule(),OptionError, \
 201     "InvalidArgument","'%s': %s",option,argument); \
 202   DestroyCompare(); \
 203   return(MagickFalse); \
 204 }
 205
 206   char
 207     *filename,
 208     *option;
 209
 210   const char
 211     *format;
 212
 213   double
 214     dissimilarity_threshold,
 215     distortion,
 216     similarity_metric,
 217     similarity_threshold;
 218
 219   Image
 220     *difference_image,
 221     *image,
 222     *reconstruct_image,
 223     *similarity_image;
 224
 225   ImageStack
 226     image_stack[MaxImageStackDepth+1];
 227
 228   MagickBooleanType
 229     fire,
 230     pend,
 231     respect_parenthesis,
 232     subimage_search;
 233
 234   MagickStatusType
 235     status;
 236
 237   MetricType
 238     metric;
 239
 240   RectangleInfo
 241     offset;
 242
 243   register ssize_t
 244     i;
 245
 246   ssize_t
 247     j,
 248     k;
 249
 250   /*
 251     Set defaults.
 252   */
 253   assert(image_info != (ImageInfo *) NULL);
 254   assert(image_info->signature == MagickSignature);
 255   if (image_info->debug != MagickFalse)
 256     (void) LogMagickEvent(TraceEvent,GetMagickModule(),"...");
 257   assert(exception != (ExceptionInfo *) NULL);
 258   if (argc == 2)
 259     {
 260       option=argv[1];
 261       if ((LocaleCompare("version",option+1) == 0) ||
 262           (LocaleCompare("-version",option+1) == 0))
 263         {
 264           ListMagickVersion(stdout);
 265           return(MagickFalse);
 266         }
 267     }
 268   if (argc < 3)
 269     return(CompareUsage());
 270   difference_image=NewImageList();
 271   similarity_image=NewImageList();
 272   dissimilarity_threshold=DefaultDissimilarityThreshold;
 273   similarity_threshold=DefaultSimilarityThreshold;
 274   distortion=0.0;
 275   format=(char *) NULL;
 276   j=1;
 277   k=0;
 278   metric=UndefinedMetric;
 279   NewImageStack();
 280   option=(char *) NULL;
 281   pend=MagickFalse;
 282   reconstruct_image=NewImageList();
 283   respect_parenthesis=MagickFalse;
 284   status=MagickTrue;
 285   subimage_search=MagickFalse;
 286   /*
 287     Compare an image.
 288   */
 289   ReadCommandlLine(argc,&argv);
 290   status=ExpandFilenames(&argc,&argv);
 291   if (status == MagickFalse)
 292     ThrowCompareException(ResourceLimitError,"MemoryAllocationFailed",
 293       GetExceptionMessage(errno));
 294   for (i=1; i < (ssize_t) (argc-1); i++)
 295   {
 296     option=argv[i];
 297     if (LocaleCompare(option,"(") == 0)
 298       {
 299         FireImageStack(MagickTrue,MagickTrue,pend);
 300         if (k == MaxImageStackDepth)
 301           ThrowCompareException(OptionError,"ParenthesisNestedTooDeeply",
 302             option);
 303         PushImageStack();
 304         continue;
 305       }
 306     if (LocaleCompare(option,")") == 0)
 307       {
 308         FireImageStack(MagickTrue,MagickTrue,MagickTrue);
 309         if (k == 0)
 310           ThrowCompareException(OptionError,"UnableToParseExpression",option);
 311         PopImageStack();
 312         continue;
 313       }
 314     if (IsCommandOption(option) == MagickFalse)
 315       {
 316         Image
 317           *images;
 318
 319         /*
 320           Read input image.
 321         */
 322         FireImageStack(MagickFalse,MagickFalse,pend);
 323         filename=argv[i];
 324         if ((LocaleCompare(filename,"--") == 0) && (i < (ssize_t) (argc-1)))
 325           filename=argv[++i];
 326         images=ReadImages(image_info,filename,exception);
 327         status&=(images != (Image *) NULL) &&
 328           (exception->severity < ErrorException);
 329         if (images == (Image *) NULL)
 330           continue;
 331         AppendImageStack(images);
 332         continue;
 333       }
 334     pend=image != (Image *) NULL ? MagickTrue : MagickFalse;
 335     switch (*(option+1))
 336     {
 337       case 'a':
 338       {
 339         if (LocaleCompare("alpha",option+1) == 0)
 340           {
 341             ssize_t
 342               type;
 343
 344             if (*option == '+')
 345               break;
 346             i++;
 347             if (i == (ssize_t) argc)
 348               ThrowCompareException(OptionError,"MissingArgument",option);
 349             type=ParseCommandOption(MagickAlphaChannelOptions,MagickFalse,argv[i]);
 350             if (type < 0)
 351               ThrowCompareException(OptionError,"UnrecognizedAlphaChannelOption",
 352                 argv[i]);
 353             break;
 354           }
 355         if (LocaleCompare("authenticate",option+1) == 0)
 356           {
 357             if (*option == '+')
 358               break;
 359             i++;
 360             if (i == (ssize_t) argc)
 361               ThrowCompareException(OptionError,"MissingArgument",option);
 362             break;
 363           }
 364         ThrowCompareException(OptionError,"UnrecognizedOption",option);
 365       }
 366       case 'c':
 367       {
 368         if (LocaleCompare("cache",option+1) == 0)
 369           {
 370             if (*option == '+')
 371               break;
 372             i++;
 373             if (i == (ssize_t) argc)
 374               ThrowCompareException(OptionError,"MissingArgument",option);
 375             if (IsGeometry(argv[i]) == MagickFalse)
 376               ThrowCompareInvalidArgumentException(option,argv[i]);
 377             break;
 378           }
 379         if (LocaleCompare("channel",option+1) == 0)
 380           {
 381             ssize_t
 382               channel;
 383
 384             if (*option == '+')
 385               break;
 386             i++;
 387             if (i == (ssize_t) (argc-1))
 388               ThrowCompareException(OptionError,"MissingArgument",option);
 389             channel=ParseChannelOption(argv[i]);
 390             if (channel < 0)
 391               ThrowCompareException(OptionError,"UnrecognizedChannelType",
 392                 argv[i]);
 393             SetPixelChannelMask(image,(ChannelType) channel);
 394             break;
 395           }
 396         if (LocaleCompare("colorspace",option+1) == 0)
 397           {
 398             ssize_t
 399               colorspace;
 400
 401             if (*option == '+')
 402               break;
 403             i++;
 404             if (i == (ssize_t) (argc-1))
 405               ThrowCompareException(OptionError,"MissingArgument",option);
 406             colorspace=ParseCommandOption(MagickColorspaceOptions,MagickFalse,
 407               argv[i]);
 408             if (colorspace < 0)
 409               ThrowCompareException(OptionError,"UnrecognizedColorspace",
 410                 argv[i]);
 411             break;
 412           }
 413         if (LocaleCompare("compose",option+1) == 0)
 414           {
 415             ssize_t
 416               compose;
 417
 418             if (*option == '+')
 419               break;
 420             i++;
 421             if (i == (ssize_t) argc)
 422               ThrowCompareException(OptionError,"MissingArgument",option);
 423             compose=ParseCommandOption(MagickComposeOptions,MagickFalse,
 424               argv[i]);
 425             if (compose < 0)
 426               ThrowCompareException(OptionError,"UnrecognizedComposeOperator",
 427                 argv[i]);
 428             break;
 429           }
 430         if (LocaleCompare("compress",option+1) == 0)
 431           {
 432             ssize_t
 433               compress;
 434
 435             if (*option == '+')
 436               break;
 437             i++;
 438             if (i == (ssize_t) (argc-1))
 439               ThrowCompareException(OptionError,"MissingArgument",option);
 440             compress=ParseCommandOption(MagickCompressOptions,MagickFalse,
 441               argv[i]);
 442             if (compress < 0)
 443               ThrowCompareException(OptionError,"UnrecognizedImageCompression",
 444                 argv[i]);
 445             break;
 446           }
 447         if (LocaleCompare("concurrent",option+1) == 0)
 448           break;
 449         ThrowCompareException(OptionError,"UnrecognizedOption",option)
 450       }
 451       case 'd':
 452       {
 453         if (LocaleCompare("debug",option+1) == 0)
 454           {
 455             LogEventType
 456               event_mask;
 457
 458             if (*option == '+')
 459               break;
 460             i++;
 461             if (i == (ssize_t) argc)
 462               ThrowCompareException(OptionError,"MissingArgument",option);
 463             event_mask=SetLogEventMask(argv[i]);
 464             if (event_mask == UndefinedEvents)
 465               ThrowCompareException(OptionError,"UnrecognizedEventType",
 466                 argv[i]);
 467             break;
 468           }
 469         if (LocaleCompare("decipher",option+1) == 0)
 470           {
 471             if (*option == '+')
 472               break;
 473             i++;
 474             if (i == (ssize_t) (argc-1))
 475               ThrowCompareException(OptionError,"MissingArgument",option);
 476             break;
 477           }
 478         if (LocaleCompare("define",option+1) == 0)
 479           {
 480             i++;
 481             if (i == (ssize_t) argc)
 482               ThrowCompareException(OptionError,"MissingArgument",option);
 483             if (*option == '+')
 484               {
 485                 const char
 486                   *define;
 487
 488                 define=GetImageOption(image_info,argv[i]);
 489                 if (define == (const char *) NULL)
 490                   ThrowCompareException(OptionError,"NoSuchOption",argv[i]);
 491                 break;
 492               }
 493             break;
 494           }
 495         if (LocaleCompare("density",option+1) == 0)
 496           {
 497             if (*option == '+')
 498               break;
 499             i++;
 500             if (i == (ssize_t) argc)
 501               ThrowCompareException(OptionError,"MissingArgument",option);
 502             if (IsGeometry(argv[i]) == MagickFalse)
 503               ThrowCompareInvalidArgumentException(option,argv[i]);
 504             break;
 505           }
 506         if (LocaleCompare("depth",option+1) == 0)
 507           {
 508             if (*option == '+')
 509               break;
 510             i++;
 511             if (i == (ssize_t) argc)
 512               ThrowCompareException(OptionError,"MissingArgument",option);
 513             if (IsGeometry(argv[i]) == MagickFalse)
 514               ThrowCompareInvalidArgumentException(option,argv[i]);
 515             break;
 516           }
 517         if (LocaleCompare("dissimilarity-threshold",option+1) == 0)
 518           {
 519             if (*option == '+')
 520               break;
 521             i++;
 522             if (i == (ssize_t) argc)
 523               ThrowCompareException(OptionError,"MissingArgument",option);
 524             if (IsGeometry(argv[i]) == MagickFalse)
 525               ThrowCompareInvalidArgumentException(option,argv[i]);
 526             if (*option == '+')
 527               dissimilarity_threshold=DefaultDissimilarityThreshold;
 528             else
 529               dissimilarity_threshold=StringToDouble(argv[i],(char **) NULL);
 530             break;
 531           }
 532         if (LocaleCompare("duration",option+1) == 0)
 533           {
 534             if (*option == '+')
 535               break;
 536             i++;
 537             if (i == (ssize_t) (argc-1))
 538               ThrowCompareException(OptionError,"MissingArgument",option);
 539             if (IsGeometry(argv[i]) == MagickFalse)
 540               ThrowCompareInvalidArgumentException(option,argv[i]);
 541             break;
 542           }
 543         ThrowCompareException(OptionError,"UnrecognizedOption",option)
 544       }
 545       case 'e':
 546       {
 547         if (LocaleCompare("encipher",option+1) == 0)
 548           {
 549             if (*option == '+')
 550               break;
 551             i++;
 552             if (i == (ssize_t) (argc-1))
 553               ThrowCompareException(OptionError,"MissingArgument",option);
 554             break;
 555           }
 556         if (LocaleCompare("extract",option+1) == 0)
 557           {
 558             if (*option == '+')
 559               break;
 560             i++;
 561             if (i == (ssize_t) (argc-1))
 562               ThrowCompareException(OptionError,"MissingArgument",option);
 563             if (IsGeometry(argv[i]) == MagickFalse)
 564               ThrowCompareInvalidArgumentException(option,argv[i]);
 565             break;
 566           }
 567         ThrowCompareException(OptionError,"UnrecognizedOption",option)
 568       }
 569       case 'f':
 570       {
 571         if (LocaleCompare("format",option+1) == 0)
 572           {
 573             if (*option == '+')
 574               break;
 575             i++;
 576             if (i == (ssize_t) argc)
 577               ThrowCompareException(OptionError,"MissingArgument",option);
 578             format=argv[i];
 579             break;
 580           }
 581         if (LocaleCompare("fuzz",option+1) == 0)
 582           {
 583             if (*option == '+')
 584               break;
 585             i++;
 586             if (i == (ssize_t) (argc-1))
 587               ThrowCompareException(OptionError,"MissingArgument",option);
 588             if (IsGeometry(argv[i]) == MagickFalse)
 589               ThrowCompareInvalidArgumentException(option,argv[i]);
 590             break;
 591           }
 592         ThrowCompareException(OptionError,"UnrecognizedOption",option)
 593       }
 594       case 'h':
 595       {
 596         if ((LocaleCompare("help",option+1) == 0) ||
 597             (LocaleCompare("-help",option+1) == 0))
 598           return(CompareUsage());
 599         if (LocaleCompare("highlight-color",option+1) == 0)
 600           {
 601             if (*option == '+')
 602               break;
 603             i++;
 604             if (i == (ssize_t) (argc-1))
 605               ThrowCompareException(OptionError,"MissingArgument",option);
 606             break;
 607           }
 608         ThrowCompareException(OptionError,"UnrecognizedOption",option)
 609       }
 610       case 'i':
 611       {
 612         if (LocaleCompare("identify",option+1) == 0)
 613           break;
 614         if (LocaleCompare("interlace",option+1) == 0)
 615           {
 616             ssize_t
 617               interlace;
 618
 619             if (*option == '+')
 620               break;
 621             i++;
 622             if (i == (ssize_t) argc)
 623               ThrowCompareException(OptionError,"MissingArgument",option);
 624             interlace=ParseCommandOption(MagickInterlaceOptions,MagickFalse,
 625               argv[i]);
 626             if (interlace < 0)
 627               ThrowCompareException(OptionError,"UnrecognizedInterlaceType",
 628                 argv[i]);
 629             break;
 630           }
 631         ThrowCompareException(OptionError,"UnrecognizedOption",option)
 632       }
 633       case 'l':
 634       {
 635         if (LocaleCompare("limit",option+1) == 0)
 636           {
 637             char
 638               *p;
 639
 640             double
 641               value;
 642
 643             ssize_t
 644               resource;
 645
 646             if (*option == '+')
 647               break;
 648             i++;
 649             if (i == (ssize_t) argc)
 650               ThrowCompareException(OptionError,"MissingArgument",option);
 651             resource=ParseCommandOption(MagickResourceOptions,MagickFalse,
 652               argv[i]);
 653             if (resource < 0)
 654               ThrowCompareException(OptionError,"UnrecognizedResourceType",
 655                 argv[i]);
 656             i++;
 657             if (i == (ssize_t) argc)
 658               ThrowCompareException(OptionError,"MissingArgument",option);
 659             value=StringToDouble(argv[i],&p);
 660             (void) value;
 661             if ((p == argv[i]) && (LocaleCompare("unlimited",argv[i]) != 0))
 662               ThrowCompareInvalidArgumentException(option,argv[i]);
 663             break;
 664           }
 665         if (LocaleCompare("list",option+1) == 0)
 666           {
 667             ssize_t
 668               list;
 669
 670             if (*option == '+')
 671               break;
 672             i++;
 673             if (i == (ssize_t) argc)
 674               ThrowCompareException(OptionError,"MissingArgument",option);
 675             list=ParseCommandOption(MagickListOptions,MagickFalse,argv[i]);
 676             if (list < 0)
 677               ThrowCompareException(OptionError,"UnrecognizedListType",argv[i]);
 678             status=MogrifyImageInfo(image_info,(int) (i-j+1),(const char **)
 679               argv+j,exception);
 680             DestroyCompare();
 681             return(status != 0 ? MagickFalse : MagickTrue);
 682           }
 683         if (LocaleCompare("log",option+1) == 0)
 684           {
 685             if (*option == '+')
 686               break;
 687             i++;
 688             if ((i == (ssize_t) argc) || (strchr(argv[i],'%') == (char *) NULL))
 689               ThrowCompareException(OptionError,"MissingArgument",option);
 690             break;
 691           }
 692         if (LocaleCompare("lowlight-color",option+1) == 0)
 693           {
 694             if (*option == '+')
 695               break;
 696             i++;
 697             if (i == (ssize_t) (argc-1))
 698               ThrowCompareException(OptionError,"MissingArgument",option);
 699             break;
 700           }
 701         ThrowCompareException(OptionError,"UnrecognizedOption",option)
 702       }
 703       case 'm':
 704       {
 705         if (LocaleCompare("matte",option+1) == 0)
 706           break;
 707         if (LocaleCompare("metric",option+1) == 0)
 708           {
 709             ssize_t
 710               type;
 711
 712             if (*option == '+')
 713               break;
 714             i++;
 715             if (i == (ssize_t) argc)
 716               ThrowCompareException(OptionError,"MissingArgument",option);
 717             type=ParseCommandOption(MagickMetricOptions,MagickTrue,argv[i]);
 718             if (type < 0)
 719               ThrowCompareException(OptionError,"UnrecognizedMetricType",
 720                 argv[i]);
 721             metric=(MetricType) type;
 722             break;
 723           }
 724         if (LocaleCompare("monitor",option+1) == 0)
 725           break;
 726         ThrowCompareException(OptionError,"UnrecognizedOption",option)
 727       }
 728       case 'p':
 729       {
 730         if (LocaleCompare("profile",option+1) == 0)
 731           {
 732             i++;
 733             if (i == (ssize_t) (argc-1))
 734               ThrowCompareException(OptionError,"MissingArgument",option);
 735             break;
 736           }
 737         ThrowCompareException(OptionError,"UnrecognizedOption",option)
 738       }
 739       case 'q':
 740       {
 741         if (LocaleCompare("quality",option+1) == 0)
 742           {
 743             if (*option == '+')
 744               break;
 745             i++;
 746             if (i == (ssize_t) (argc-1))
 747               ThrowCompareException(OptionError,"MissingArgument",option);
 748             if (IsGeometry(argv[i]) == MagickFalse)
 749               ThrowCompareInvalidArgumentException(option,argv[i]);
 750             break;
 751           }
 752         if (LocaleCompare("quantize",option+1) == 0)
 753           {
 754             ssize_t
 755               colorspace;
 756
 757             if (*option == '+')
 758               break;
 759             i++;
 760             if (i == (ssize_t) (argc-1))
 761               ThrowCompareException(OptionError,"MissingArgument",option);
 762             colorspace=ParseCommandOption(MagickColorspaceOptions,
 763               MagickFalse,argv[i]);
 764             if (colorspace < 0)
 765               ThrowCompareException(OptionError,"UnrecognizedColorspace",
 766                 argv[i]);
 767             break;
 768           }
 769         if (LocaleCompare("quiet",option+1) == 0)
 770           break;
 771         ThrowCompareException(OptionError,"UnrecognizedOption",option)
 772       }
 773       case 'r':
 774       {
 775         if (LocaleCompare("regard-warnings",option+1) == 0)
 776           break;
 777         if (LocaleNCompare("respect-parentheses",option+1,17) == 0)
 778           {
 779             respect_parenthesis=(*option == '-') ? MagickTrue : MagickFalse;
 780             break;
 781           }
 782         ThrowCompareException(OptionError,"UnrecognizedOption",option)
 783       }
 784       case 's':
 785       {
 786         if (LocaleCompare("sampling-factor",option+1) == 0)
 787           {
 788             if (*option == '+')
 789               break;
 790             i++;
 791             if (i == (ssize_t) argc)
 792               ThrowCompareException(OptionError,"MissingArgument",option);
 793             if (IsGeometry(argv[i]) == MagickFalse)
 794               ThrowCompareInvalidArgumentException(option,argv[i]);
 795             break;
 796           }
 797         if (LocaleCompare("seed",option+1) == 0)
 798           {
 799             if (*option == '+')
 800               break;
 801             i++;
 802             if (i == (ssize_t) (argc-1))
 803               ThrowCompareException(OptionError,"MissingArgument",option);
 804             if (IsGeometry(argv[i]) == MagickFalse)
 805               ThrowCompareInvalidArgumentException(option,argv[i]);
 806             break;
 807           }
 808         if (LocaleCompare("set",option+1) == 0)
 809           {
 810             i++;
 811             if (i == (ssize_t) argc)
 812               ThrowCompareException(OptionError,"MissingArgument",option);
 813             if (*option == '+')
 814               break;
 815             i++;
 816             if (i == (ssize_t) argc)
 817               ThrowCompareException(OptionError,"MissingArgument",option);
 818             break;
 819           }
 820         if (LocaleCompare("similarity-threshold",option+1) == 0)
 821           {
 822             if (*option == '+')
 823               break;
 824             i++;
 825             if (i == (ssize_t) argc)
 826               ThrowCompareException(OptionError,"MissingArgument",option);
 827             if (IsGeometry(argv[i]) == MagickFalse)
 828               ThrowCompareInvalidArgumentException(option,argv[i]);
 829             if (*option == '+')
 830               similarity_threshold=DefaultSimilarityThreshold;
 831             else
 832               similarity_threshold=StringToDouble(argv[i],(char **) NULL);
 833             break;
 834           }
 835         if (LocaleCompare("size",option+1) == 0)
 836           {
 837             if (*option == '+')
 838               break;
 839             i++;
 840             if (i == (ssize_t) argc)
 841               ThrowCompareException(OptionError,"MissingArgument",option);
 842             if (IsGeometry(argv[i]) == MagickFalse)
 843               ThrowCompareInvalidArgumentException(option,argv[i]);
 844             break;
 845           }
 846         if (LocaleCompare("subimage-search",option+1) == 0)
 847           {
 848             if (*option == '+')
 849               {
 850                 subimage_search=MagickFalse;
 851                 break;
 852               }
 853             subimage_search=MagickTrue;
 854             break;
 855           }
 856         if (LocaleCompare("synchronize",option+1) == 0)
 857           break;
 858         ThrowCompareException(OptionError,"UnrecognizedOption",option)
 859       }
 860       case 't':
 861       {
 862         if (LocaleCompare("taint",option+1) == 0)
 863           break;
 864         if (LocaleCompare("transparent-color",option+1) == 0)
 865           {
 866             if (*option == '+')
 867               break;
 868             i++;
 869             if (i == (ssize_t) (argc-1))
 870               ThrowCompareException(OptionError,"MissingArgument",option);
 871             break;
 872           }
 873         if (LocaleCompare("type",option+1) == 0)
 874           {
 875             ssize_t
 876               type;
 877
 878             if (*option == '+')
 879               break;
 880             i++;
 881             if (i == (ssize_t) argc)
 882               ThrowCompareException(OptionError,"MissingArgument",option);
 883             type=ParseCommandOption(MagickTypeOptions,MagickFalse,argv[i]);
 884             if (type < 0)
 885               ThrowCompareException(OptionError,"UnrecognizedImageType",
 886                 argv[i]);
 887             break;
 888           }
 889         ThrowCompareException(OptionError,"UnrecognizedOption",option)
 890       }
 891       case 'v':
 892       {
 893         if (LocaleCompare("verbose",option+1) == 0)
 894           break;
 895         if ((LocaleCompare("version",option+1) == 0) ||
 896             (LocaleCompare("-version",option+1) == 0))
 897           {
 898             ListMagickVersion(stdout);
 899             break;
 900           }
 901         if (LocaleCompare("virtual-pixel",option+1) == 0)
 902           {
 903             ssize_t
 904               method;
 905
 906             if (*option == '+')
 907               break;
 908             i++;
 909             if (i == (ssize_t) (argc-1))
 910               ThrowCompareException(OptionError,"MissingArgument",option);
 911             method=ParseCommandOption(MagickVirtualPixelOptions,MagickFalse,
 912               argv[i]);
 913             if (method < 0)
 914               ThrowCompareException(OptionError,
 915                 "UnrecognizedVirtualPixelMethod",argv[i]);
 916             break;
 917           }
 918         ThrowCompareException(OptionError,"UnrecognizedOption",option)
 919       }
 920       case '?':
 921         break;
 922       default:
 923         ThrowCompareException(OptionError,"UnrecognizedOption",option)
 924     }
 925     fire=(GetCommandOptionFlags(MagickCommandOptions,MagickFalse,option) &
 926       FireOptionFlag) == 0 ?  MagickFalse : MagickTrue;
 927     if (fire != MagickFalse)
 928       FireImageStack(MagickTrue,MagickTrue,MagickTrue);
 929   }
 930   if (k != 0)
 931     ThrowCompareException(OptionError,"UnbalancedParenthesis",argv[i]);
 932   if (i-- != (ssize_t) (argc-1))
 933     ThrowCompareException(OptionError,"MissingAnImageFilename",argv[i]);
 934   if ((image == (Image *) NULL) || (GetImageListLength(image) < 2))
 935     ThrowCompareException(OptionError,"MissingAnImageFilename",argv[i]);
 936   FinalizeImageSettings(image_info,image,MagickTrue);
 937   if ((image == (Image *) NULL) || (GetImageListLength(image) < 2))
 938     ThrowCompareException(OptionError,"MissingAnImageFilename",argv[i]);
 939   image=GetImageFromList(image,0);
 940   reconstruct_image=GetImageFromList(image,1);
 941   if (subimage_search != MagickFalse)
 942     {
 943       similarity_image=SimilarityImage(image,reconstruct_image,metric,
 944         similarity_threshold,&offset,&similarity_metric,exception);
 945       if (similarity_metric > dissimilarity_threshold)
 946         ThrowCompareException(ImageError,"ImagesTooDissimilar",image->filename);
 947     }
 948   if ((reconstruct_image->columns == image->columns) &&
 949       (reconstruct_image->rows == image->rows))
 950     difference_image=CompareImages(image,reconstruct_image,metric,&distortion,
 951       exception);
 952   else
 953     if (similarity_image == (Image *) NULL)
 954       ThrowCompareException(OptionError,"ImageWidthsOrHeightsDiffer",
 955         image->filename)
 956     else
 957       {
 958         Image
 959           *composite_image;
 960
 961         /*
 962           Determine if reconstructed image is a subimage of the image.
 963         */
 964         composite_image=CloneImage(image,0,0,MagickTrue,exception);
 965         if (composite_image == (Image *) NULL)
 966           difference_image=CompareImages(image,reconstruct_image,metric,
 967             &distortion,exception);
 968         else
 969           {
 970             (void) CompositeImage(composite_image,reconstruct_image,
 971               CopyCompositeOp,MagickTrue,offset.x,offset.y,exception);
 972             difference_image=CompareImages(image,composite_image,metric,
 973               &distortion,exception);
 974             if (difference_image != (Image *) NULL)
 975               {
 976                 difference_image->page.x=offset.x;
 977                 difference_image->page.y=offset.y;
 978               }
 979             composite_image=DestroyImage(composite_image);
 980           }
 981         if (difference_image != (Image *) NULL)
 982           {
 983             AppendImageToList(&difference_image,similarity_image);
 984             similarity_image=(Image *) NULL;
 985           }
 986       }
 987   if (difference_image == (Image *) NULL)
 988     status=0;
 989   else
 990     {
 991       if (image_info->verbose != MagickFalse)
 992         (void) IsImagesEqual(image,reconstruct_image,exception);
 993       if (*difference_image->magick == '\0')
 994         (void) CopyMagickString(difference_image->magick,image->magick,
 995           MaxTextExtent);
 996       if (image_info->verbose == MagickFalse)
 997         {
 998           switch (metric)
 999           {
1000             case FuzzErrorMetric:
1001             case MeanAbsoluteErrorMetric:
1002             case MeanSquaredErrorMetric:
1003             case RootMeanSquaredErrorMetric:
1004             case PeakAbsoluteErrorMetric:
1005             {
1006               (void) FormatLocaleFile(stderr,"%g (%g)",QuantumRange*distortion,
1007                 (double) distortion);
1008               if ((reconstruct_image->columns != image->columns) ||
1009                   (reconstruct_image->rows != image->rows))
1010                 (void) FormatLocaleFile(stderr," @ %.20g,%.20g",(double)
1011                   difference_image->page.x,(double) difference_image->page.y);
1012               (void) FormatLocaleFile(stderr,"\n");
1013               break;
1014             }
1015             case AbsoluteErrorMetric:
1016             case NormalizedCrossCorrelationErrorMetric:
1017             case PeakSignalToNoiseRatioMetric:
1018             {
1019               (void) FormatLocaleFile(stderr,"%g",distortion);
1020               if ((reconstruct_image->columns != image->columns) ||
1021                   (reconstruct_image->rows != image->rows))
1022                 (void) FormatLocaleFile(stderr," @ %.20g,%.20g",(double)
1023                   difference_image->page.x,(double) difference_image->page.y);
1024               (void) FormatLocaleFile(stderr,"\n");
1025               break;
1026             }
1027             case MeanErrorPerPixelMetric:
1028             {
1029               (void) FormatLocaleFile(stderr,"%g (%g, %g)",distortion,
1030                 image->error.normalized_mean_error,
1031                 image->error.normalized_maximum_error);
1032               if ((reconstruct_image->columns != image->columns) ||
1033                   (reconstruct_image->rows != image->rows))
1034                 (void) FormatLocaleFile(stderr," @ %.20g,%.20g",(double)
1035                   difference_image->page.x,(double) difference_image->page.y);
1036               (void) FormatLocaleFile(stderr,"\n");
1037               break;
1038             }
1039             case UndefinedMetric:
1040               break;
1041           }
1042         }
1043       else
1044         {
1045           double
1046             *channel_distortion;
1047
1048           channel_distortion=GetImageDistortions(image,reconstruct_image,
1049             metric,exception);
1050           (void) FormatLocaleFile(stderr,"Image: %s\n",image->filename);
1051           if ((reconstruct_image->columns != image->columns) ||
1052               (reconstruct_image->rows != image->rows))
1053             (void) FormatLocaleFile(stderr,"Offset: %.20g,%.20g\n",(double)
1054               difference_image->page.x,(double) difference_image->page.y);
1055           (void) FormatLocaleFile(stderr,"  Channel distortion: %s\n",
1056             CommandOptionToMnemonic(MagickMetricOptions,(ssize_t) metric));
1057           switch (metric)
1058           {
1059             case FuzzErrorMetric:
1060             case MeanAbsoluteErrorMetric:
1061             case MeanSquaredErrorMetric:
1062             case RootMeanSquaredErrorMetric:
1063             case PeakAbsoluteErrorMetric:
1064             {
1065               switch (image->colorspace)
1066               {
1067                 case RGBColorspace:
1068                 default:
1069                 {
1070                   (void) FormatLocaleFile(stderr,"    red: %g (%g)\n",
1071                     QuantumRange*channel_distortion[RedPixelChannel],
1072                     channel_distortion[RedPixelChannel]);
1073                   (void) FormatLocaleFile(stderr,"    green: %g (%g)\n",
1074                     QuantumRange*channel_distortion[GreenPixelChannel],
1075                     channel_distortion[GreenPixelChannel]);
1076                   (void) FormatLocaleFile(stderr,"    blue: %g (%g)\n",
1077                     QuantumRange*channel_distortion[BluePixelChannel],
1078                     channel_distortion[BluePixelChannel]);
1079                   if (image->alpha_trait == BlendPixelTrait)
1080                     (void) FormatLocaleFile(stderr,"    alpha: %g (%g)\n",
1081                       QuantumRange*channel_distortion[AlphaPixelChannel],
1082                       channel_distortion[AlphaPixelChannel]);
1083                   break;
1084                 }
1085                 case CMYKColorspace:
1086                 {
1087                   (void) FormatLocaleFile(stderr,"    cyan: %g (%g)\n",
1088                     QuantumRange*channel_distortion[CyanPixelChannel],
1089                     channel_distortion[CyanPixelChannel]);
1090                   (void) FormatLocaleFile(stderr,"    magenta: %g (%g)\n",
1091                     QuantumRange*channel_distortion[MagentaPixelChannel],
1092                     channel_distortion[MagentaPixelChannel]);
1093                   (void) FormatLocaleFile(stderr,"    yellow: %g (%g)\n",
1094                     QuantumRange*channel_distortion[YellowPixelChannel],
1095                     channel_distortion[YellowPixelChannel]);
1096                   (void) FormatLocaleFile(stderr,"    black: %g (%g)\n",
1097                     QuantumRange*channel_distortion[BlackPixelChannel],
1098                     channel_distortion[BlackPixelChannel]);
1099                   if (image->alpha_trait == BlendPixelTrait)
1100                     (void) FormatLocaleFile(stderr,"    alpha: %g (%g)\n",
1101                       QuantumRange*channel_distortion[AlphaPixelChannel],
1102                       channel_distortion[AlphaPixelChannel]);
1103                   break;
1104                 }
1105                 case GRAYColorspace:
1106                 {
1107                   (void) FormatLocaleFile(stderr,"    gray: %g (%g)\n",
1108                     QuantumRange*channel_distortion[GrayPixelChannel],
1109                     channel_distortion[GrayPixelChannel]);
1110                   if (image->alpha_trait == BlendPixelTrait)
1111                     (void) FormatLocaleFile(stderr,"    alpha: %g (%g)\n",
1112                       QuantumRange*channel_distortion[AlphaPixelChannel],
1113                       channel_distortion[AlphaPixelChannel]);
1114                   break;
1115                 }
1116               }
1117               (void) FormatLocaleFile(stderr,"    all: %g (%g)\n",
1118                 QuantumRange*channel_distortion[MaxPixelChannels],
1119                 channel_distortion[MaxPixelChannels]);
1120               break;
1121             }
1122             case AbsoluteErrorMetric:
1123             case NormalizedCrossCorrelationErrorMetric:
1124             case PeakSignalToNoiseRatioMetric:
1125             {
1126               switch (image->colorspace)
1127               {
1128                 case RGBColorspace:
1129                 default:
1130                 {
1131                   (void) FormatLocaleFile(stderr,"    red: %g\n",
1132                     channel_distortion[RedPixelChannel]);
1133                   (void) FormatLocaleFile(stderr,"    green: %g\n",
1134                     channel_distortion[GreenPixelChannel]);
1135                   (void) FormatLocaleFile(stderr,"    blue: %g\n",
1136                     channel_distortion[BluePixelChannel]);
1137                   if (image->alpha_trait == BlendPixelTrait)
1138                     (void) FormatLocaleFile(stderr,"    alpha: %g\n",
1139                       channel_distortion[AlphaPixelChannel]);
1140                   break;
1141                 }
1142                 case CMYKColorspace:
1143                 {
1144                   (void) FormatLocaleFile(stderr,"    cyan: %g\n",
1145                     channel_distortion[CyanPixelChannel]);
1146                   (void) FormatLocaleFile(stderr,"    magenta: %g\n",
1147                     channel_distortion[MagentaPixelChannel]);
1148                   (void) FormatLocaleFile(stderr,"    yellow: %g\n",
1149                     channel_distortion[YellowPixelChannel]);
1150                   (void) FormatLocaleFile(stderr,"    black: %g\n",
1151                     channel_distortion[BlackPixelChannel]);
1152                   if (image->alpha_trait == BlendPixelTrait)
1153                     (void) FormatLocaleFile(stderr,"    alpha: %g\n",
1154                       channel_distortion[AlphaPixelChannel]);
1155                   break;
1156                 }
1157                 case GRAYColorspace:
1158                 {
1159                   (void) FormatLocaleFile(stderr,"    gray: %g\n",
1160                     channel_distortion[GrayPixelChannel]);
1161                   if (image->alpha_trait == BlendPixelTrait)
1162                     (void) FormatLocaleFile(stderr,"    alpha: %g\n",
1163                       channel_distortion[AlphaPixelChannel]);
1164                   break;
1165                 }
1166               }
1167               (void) FormatLocaleFile(stderr,"    all: %g\n",
1168                 channel_distortion[MaxPixelChannels]);
1169               break;
1170             }
1171             case MeanErrorPerPixelMetric:
1172             {
1173               (void) FormatLocaleFile(stderr,"    %g (%g, %g)\n",
1174                 channel_distortion[MaxPixelChannels],
1175                 image->error.normalized_mean_error,
1176                 image->error.normalized_maximum_error);
1177               break;
1178             }
1179             case UndefinedMetric:
1180               break;
1181           }
1182           channel_distortion=(double *) RelinquishMagickMemory(
1183             channel_distortion);
1184         }
1185       status&=WriteImages(image_info,difference_image,argv[argc-1],exception);
1186       if ((metadata != (char **) NULL) && (format != (char *) NULL))
1187         {
1188           char
1189             *text;
1190
1191           text=InterpretImageProperties(image_info,difference_image,format,
1192             exception);
1193           if (text == (char *) NULL)
1194             ThrowCompareException(ResourceLimitError,"MemoryAllocationFailed",
1195               GetExceptionMessage(errno));
1196           (void) ConcatenateString(&(*metadata),text);
1197           (void) ConcatenateString(&(*metadata),"\n");
1198           text=DestroyString(text);
1199         }
1200       difference_image=DestroyImageList(difference_image);
1201     }
1202   DestroyCompare();
1203   return((status != 0) || (distortion != 0.0) ? MagickTrue : MagickFalse);
1204 }