granicus.if.org Git - imagemagick/blob - wand/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 1999-2011 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 "wand/studio.h"
  45 #include "wand/MagickWand.h"
  46 #include "wand/mogrify-private.h"
  47 #include "magick/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 %  CompareImageCommand() 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 CompareImageCommand method is:
  65 %
  66 %      MagickBooleanType CompareImageCommand(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       "-size geometry       width and height of image",
 140       "-subimage-search     search for subimage",
 141       "-transparent-color color",
 142       "                     transparent color",
 143       "-type type           image type",
 144       "-verbose             print detailed information about the image",
 145       "-version             print version information",
 146       "-virtual-pixel method",
 147       "                     virtual pixel access method",
 148       (char *) NULL
 149     };
 150
 151   (void) printf("Version: %s\n",GetMagickVersion((size_t *) NULL));
 152   (void) printf("Copyright: %s\n",GetMagickCopyright());
 153   (void) printf("Features: %s\n\n",GetMagickFeatures());
 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 CompareImageCommand(ImageInfo *image_info,
 175   int argc,char **argv,char **metadata,ExceptionInfo *exception)
 176 {
 177 #define DefaultDissimilarityThreshold  0.31830988618379067154
 178 #define DestroyCompare() \
 179 { \
 180   if (similarity_image != (Image *) NULL) \
 181     similarity_image=DestroyImageList(similarity_image); \
 182   if (difference_image != (Image *) NULL) \
 183     difference_image=DestroyImageList(difference_image); \
 184   DestroyImageStack(); \
 185   for (i=0; i < (ssize_t) argc; i++) \
 186     argv[i]=DestroyString(argv[i]); \
 187   argv=(char **) RelinquishMagickMemory(argv); \
 188 }
 189 #define ThrowCompareException(asperity,tag,option) \
 190 { \
 191   if (exception->severity < (asperity)) \
 192     (void) ThrowMagickException(exception,GetMagickModule(),asperity,tag, \
 193       "`%s'",option); \
 194   DestroyCompare(); \
 195   return(MagickFalse); \
 196 }
 197 #define ThrowCompareInvalidArgumentException(option,argument) \
 198 { \
 199   (void) ThrowMagickException(exception,GetMagickModule(),OptionError, \
 200     "InvalidArgument","`%s': %s",option,argument); \
 201   DestroyCompare(); \
 202   return(MagickFalse); \
 203 }
 204
 205   char
 206     *filename,
 207     *option;
 208
 209   const char
 210     *format;
 211
 212   ChannelType
 213     channels;
 214
 215   double
 216     dissimilarity_threshold,
 217     distortion,
 218     similarity_metric;
 219
 220   Image
 221     *difference_image,
 222     *image,
 223     *reconstruct_image,
 224     *similarity_image;
 225
 226   ImageStack
 227     image_stack[MaxImageStackDepth+1];
 228
 229   MagickBooleanType
 230     fire,
 231     pend,
 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           (void) fprintf(stdout,"Version: %s\n",
 265             GetMagickVersion((size_t *) NULL));
 266           (void) fprintf(stdout,"Copyright: %s\n",GetMagickCopyright());
 267           (void) fprintf(stdout,"Features: %s\n\n",GetMagickFeatures());
 268           return(MagickFalse);
 269         }
 270     }
 271   if (argc < 3)
 272     return(CompareUsage());
 273   channels=AllChannels;
 274   difference_image=NewImageList();
 275   similarity_image=NewImageList();
 276   dissimilarity_threshold=DefaultDissimilarityThreshold;
 277   distortion=0.0;
 278   format=(char *) NULL;
 279   j=1;
 280   k=0;
 281   metric=UndefinedMetric;
 282   NewImageStack();
 283   option=(char *) NULL;
 284   pend=MagickFalse;
 285   reconstruct_image=NewImageList();
 286   status=MagickTrue;
 287   subimage_search=MagickFalse;
 288   /*
 289     Compare an image.
 290   */
 291   ReadCommandlLine(argc,&argv);
 292   status=ExpandFilenames(&argc,&argv);
 293   if (status == MagickFalse)
 294     ThrowCompareException(ResourceLimitError,"MemoryAllocationFailed",
 295       GetExceptionMessage(errno));
 296   for (i=1; i < (ssize_t) (argc-1); i++)
 297   {
 298     option=argv[i];
 299     if (LocaleCompare(option,"(") == 0)
 300       {
 301         FireImageStack(MagickTrue,MagickTrue,pend);
 302         if (k == MaxImageStackDepth)
 303           ThrowCompareException(OptionError,"ParenthesisNestedTooDeeply",
 304             option);
 305         PushImageStack();
 306         continue;
 307       }
 308     if (LocaleCompare(option,")") == 0)
 309       {
 310         FireImageStack(MagickTrue,MagickTrue,MagickTrue);
 311         if (k == 0)
 312           ThrowCompareException(OptionError,"UnableToParseExpression",option);
 313         PopImageStack();
 314         continue;
 315       }
 316     if (IsMagickOption(option) == MagickFalse)
 317       {
 318         Image
 319           *images;
 320
 321         /*
 322           Read input image.
 323         */
 324         FireImageStack(MagickFalse,MagickFalse,pend);
 325         filename=argv[i];
 326         if ((LocaleCompare(filename,"--") == 0) && (i < (ssize_t) (argc-1)))
 327           filename=argv[++i];
 328         (void) CopyMagickString(image_info->filename,filename,MaxTextExtent);
 329         images=ReadImages(image_info,exception);
 330         status&=(images != (Image *) NULL) &&
 331           (exception->severity < ErrorException);
 332         if (images == (Image *) NULL)
 333           continue;
 334         AppendImageStack(images);
 335         continue;
 336       }
 337     pend=image != (Image *) NULL ? MagickTrue : MagickFalse;
 338     switch (*(option+1))
 339     {
 340       case 'a':
 341       {
 342         if (LocaleCompare("alpha",option+1) == 0)
 343           {
 344             ssize_t
 345               type;
 346
 347             if (*option == '+')
 348               break;
 349             i++;
 350             if (i == (ssize_t) argc)
 351               ThrowCompareException(OptionError,"MissingArgument",option);
 352             type=ParseMagickOption(MagickAlphaOptions,MagickFalse,argv[i]);
 353             if (type < 0)
 354               ThrowCompareException(OptionError,"UnrecognizedAlphaChannelType",
 355                 argv[i]);
 356             break;
 357           }
 358         if (LocaleCompare("authenticate",option+1) == 0)
 359           {
 360             if (*option == '+')
 361               break;
 362             i++;
 363             if (i == (ssize_t) argc)
 364               ThrowCompareException(OptionError,"MissingArgument",option);
 365             break;
 366           }
 367         ThrowCompareException(OptionError,"UnrecognizedOption",option);
 368       }
 369       case 'c':
 370       {
 371         if (LocaleCompare("cache",option+1) == 0)
 372           {
 373             if (*option == '+')
 374               break;
 375             i++;
 376             if (i == (ssize_t) argc)
 377               ThrowCompareException(OptionError,"MissingArgument",option);
 378             if (IsGeometry(argv[i]) == MagickFalse)
 379               ThrowCompareInvalidArgumentException(option,argv[i]);
 380             break;
 381           }
 382         if (LocaleCompare("channel",option+1) == 0)
 383           {
 384             ssize_t
 385               channel;
 386
 387             if (*option == '+')
 388               break;
 389             i++;
 390             if (i == (ssize_t) (argc-1))
 391               ThrowCompareException(OptionError,"MissingArgument",option);
 392             channel=ParseChannelOption(argv[i]);
 393             if (channel < 0)
 394               ThrowCompareException(OptionError,"UnrecognizedChannelType",
 395                 argv[i]);
 396             channels=(ChannelType) channel;
 397             break;
 398           }
 399         if (LocaleCompare("colorspace",option+1) == 0)
 400           {
 401             ssize_t
 402               colorspace;
 403
 404             if (*option == '+')
 405               break;
 406             i++;
 407             if (i == (ssize_t) (argc-1))
 408               ThrowCompareException(OptionError,"MissingArgument",option);
 409             colorspace=ParseMagickOption(MagickColorspaceOptions,MagickFalse,
 410               argv[i]);
 411             if (colorspace < 0)
 412               ThrowCompareException(OptionError,"UnrecognizedColorspace",
 413                 argv[i]);
 414             break;
 415           }
 416         if (LocaleCompare("compose",option+1) == 0)
 417           {
 418             ssize_t
 419               compose;
 420
 421             if (*option == '+')
 422               break;
 423             i++;
 424             if (i == (ssize_t) argc)
 425               ThrowCompareException(OptionError,"MissingArgument",option);
 426             compose=ParseMagickOption(MagickComposeOptions,MagickFalse,
 427               argv[i]);
 428             if (compose < 0)
 429               ThrowCompareException(OptionError,"UnrecognizedComposeOperator",
 430                 argv[i]);
 431             break;
 432           }
 433         if (LocaleCompare("compress",option+1) == 0)
 434           {
 435             ssize_t
 436               compress;
 437
 438             if (*option == '+')
 439               break;
 440             i++;
 441             if (i == (ssize_t) (argc-1))
 442               ThrowCompareException(OptionError,"MissingArgument",option);
 443             compress=ParseMagickOption(MagickCompressOptions,MagickFalse,
 444               argv[i]);
 445             if (compress < 0)
 446               ThrowCompareException(OptionError,"UnrecognizedImageCompression",
 447                 argv[i]);
 448             break;
 449           }
 450         if (LocaleCompare("concurrent",option+1) == 0)
 451           break;
 452         ThrowCompareException(OptionError,"UnrecognizedOption",option)
 453       }
 454       case 'd':
 455       {
 456         if (LocaleCompare("debug",option+1) == 0)
 457           {
 458             LogEventType
 459               event_mask;
 460
 461             if (*option == '+')
 462               break;
 463             i++;
 464             if (i == (ssize_t) argc)
 465               ThrowCompareException(OptionError,"MissingArgument",option);
 466             event_mask=SetLogEventMask(argv[i]);
 467             if (event_mask == UndefinedEvents)
 468               ThrowCompareException(OptionError,"UnrecognizedEventType",
 469                 argv[i]);
 470             break;
 471           }
 472         if (LocaleCompare("decipher",option+1) == 0)
 473           {
 474             if (*option == '+')
 475               break;
 476             i++;
 477             if (i == (ssize_t) (argc-1))
 478               ThrowCompareException(OptionError,"MissingArgument",option);
 479             break;
 480           }
 481         if (LocaleCompare("define",option+1) == 0)
 482           {
 483             i++;
 484             if (i == (ssize_t) argc)
 485               ThrowCompareException(OptionError,"MissingArgument",option);
 486             if (*option == '+')
 487               {
 488                 const char
 489                   *define;
 490
 491                 define=GetImageOption(image_info,argv[i]);
 492                 if (define == (const char *) NULL)
 493                   ThrowCompareException(OptionError,"NoSuchOption",argv[i]);
 494                 break;
 495               }
 496             break;
 497           }
 498         if (LocaleCompare("density",option+1) == 0)
 499           {
 500             if (*option == '+')
 501               break;
 502             i++;
 503             if (i == (ssize_t) argc)
 504               ThrowCompareException(OptionError,"MissingArgument",option);
 505             if (IsGeometry(argv[i]) == MagickFalse)
 506               ThrowCompareInvalidArgumentException(option,argv[i]);
 507             break;
 508           }
 509         if (LocaleCompare("depth",option+1) == 0)
 510           {
 511             if (*option == '+')
 512               break;
 513             i++;
 514             if (i == (ssize_t) argc)
 515               ThrowCompareException(OptionError,"MissingArgument",option);
 516             if (IsGeometry(argv[i]) == MagickFalse)
 517               ThrowCompareInvalidArgumentException(option,argv[i]);
 518             break;
 519           }
 520         if (LocaleCompare("dissimilarity-threshold",option+1) == 0)
 521           {
 522             if (*option == '+')
 523               break;
 524             i++;
 525             if (i == (ssize_t) argc)
 526               ThrowCompareException(OptionError,"MissingArgument",option);
 527             if (IsGeometry(argv[i]) == MagickFalse)
 528               ThrowCompareInvalidArgumentException(option,argv[i]);
 529             if (*option == '+')
 530               dissimilarity_threshold=DefaultDissimilarityThreshold;
 531             else
 532               dissimilarity_threshold=StringToDouble(argv[i]);
 533             break;
 534           }
 535         if (LocaleCompare("duration",option+1) == 0)
 536           {
 537             if (*option == '+')
 538               break;
 539             i++;
 540             if (i == (ssize_t) (argc-1))
 541               ThrowCompareException(OptionError,"MissingArgument",option);
 542             if (IsGeometry(argv[i]) == MagickFalse)
 543               ThrowCompareInvalidArgumentException(option,argv[i]);
 544             break;
 545           }
 546         ThrowCompareException(OptionError,"UnrecognizedOption",option)
 547       }
 548       case 'e':
 549       {
 550         if (LocaleCompare("encipher",option+1) == 0)
 551           {
 552             if (*option == '+')
 553               break;
 554             i++;
 555             if (i == (ssize_t) (argc-1))
 556               ThrowCompareException(OptionError,"MissingArgument",option);
 557             break;
 558           }
 559         if (LocaleCompare("extract",option+1) == 0)
 560           {
 561             if (*option == '+')
 562               break;
 563             i++;
 564             if (i == (ssize_t) (argc-1))
 565               ThrowCompareException(OptionError,"MissingArgument",option);
 566             if (IsGeometry(argv[i]) == MagickFalse)
 567               ThrowCompareInvalidArgumentException(option,argv[i]);
 568             break;
 569           }
 570         ThrowCompareException(OptionError,"UnrecognizedOption",option)
 571       }
 572       case 'f':
 573       {
 574         if (LocaleCompare("format",option+1) == 0)
 575           {
 576             if (*option == '+')
 577               break;
 578             i++;
 579             if (i == (ssize_t) argc)
 580               ThrowCompareException(OptionError,"MissingArgument",option);
 581             format=argv[i];
 582             break;
 583           }
 584         if (LocaleCompare("fuzz",option+1) == 0)
 585           {
 586             if (*option == '+')
 587               break;
 588             i++;
 589             if (i == (ssize_t) (argc-1))
 590               ThrowCompareException(OptionError,"MissingArgument",option);
 591             if (IsGeometry(argv[i]) == MagickFalse)
 592               ThrowCompareInvalidArgumentException(option,argv[i]);
 593             break;
 594           }
 595         ThrowCompareException(OptionError,"UnrecognizedOption",option)
 596       }
 597       case 'h':
 598       {
 599         if ((LocaleCompare("help",option+1) == 0) ||
 600             (LocaleCompare("-help",option+1) == 0))
 601           return(CompareUsage());
 602         if (LocaleCompare("highlight-color",option+1) == 0)
 603           {
 604             if (*option == '+')
 605               break;
 606             i++;
 607             if (i == (ssize_t) (argc-1))
 608               ThrowCompareException(OptionError,"MissingArgument",option);
 609             break;
 610           }
 611         ThrowCompareException(OptionError,"UnrecognizedOption",option)
 612       }
 613       case 'i':
 614       {
 615         if (LocaleCompare("identify",option+1) == 0)
 616           break;
 617         if (LocaleCompare("interlace",option+1) == 0)
 618           {
 619             ssize_t
 620               interlace;
 621
 622             if (*option == '+')
 623               break;
 624             i++;
 625             if (i == (ssize_t) argc)
 626               ThrowCompareException(OptionError,"MissingArgument",option);
 627             interlace=ParseMagickOption(MagickInterlaceOptions,MagickFalse,
 628               argv[i]);
 629             if (interlace < 0)
 630               ThrowCompareException(OptionError,"UnrecognizedInterlaceType",
 631                 argv[i]);
 632             break;
 633           }
 634         ThrowCompareException(OptionError,"UnrecognizedOption",option)
 635       }
 636       case 'l':
 637       {
 638         if (LocaleCompare("limit",option+1) == 0)
 639           {
 640             char
 641               *p;
 642
 643             double
 644               value;
 645
 646             ssize_t
 647               resource;
 648
 649             if (*option == '+')
 650               break;
 651             i++;
 652             if (i == (ssize_t) argc)
 653               ThrowCompareException(OptionError,"MissingArgument",option);
 654             resource=ParseMagickOption(MagickResourceOptions,MagickFalse,
 655               argv[i]);
 656             if (resource < 0)
 657               ThrowCompareException(OptionError,"UnrecognizedResourceType",
 658                 argv[i]);
 659             i++;
 660             if (i == (ssize_t) argc)
 661               ThrowCompareException(OptionError,"MissingArgument",option);
 662             value=strtod(argv[i],&p);
 663             if ((p == argv[i]) && (LocaleCompare("unlimited",argv[i]) != 0))
 664               ThrowCompareInvalidArgumentException(option,argv[i]);
 665             break;
 666           }
 667         if (LocaleCompare("list",option+1) == 0)
 668           {
 669             ssize_t
 670               list;
 671
 672             if (*option == '+')
 673               break;
 674             i++;
 675             if (i == (ssize_t) argc)
 676               ThrowCompareException(OptionError,"MissingArgument",option);
 677             list=ParseMagickOption(MagickListOptions,MagickFalse,argv[i]);
 678             if (list < 0)
 679               ThrowCompareException(OptionError,"UnrecognizedListType",argv[i]);
 680             status=MogrifyImageInfo(image_info,(int) (i-j+1),(const char **)
 681               argv+j,exception);
 682             DestroyCompare();
 683             return(status != 0 ? MagickFalse : MagickTrue);
 684           }
 685         if (LocaleCompare("log",option+1) == 0)
 686           {
 687             if (*option == '+')
 688               break;
 689             i++;
 690             if ((i == (ssize_t) argc) || (strchr(argv[i],'%') == (char *) NULL))
 691               ThrowCompareException(OptionError,"MissingArgument",option);
 692             break;
 693           }
 694         if (LocaleCompare("lowlight-color",option+1) == 0)
 695           {
 696             if (*option == '+')
 697               break;
 698             i++;
 699             if (i == (ssize_t) (argc-1))
 700               ThrowCompareException(OptionError,"MissingArgument",option);
 701             break;
 702           }
 703         ThrowCompareException(OptionError,"UnrecognizedOption",option)
 704       }
 705       case 'm':
 706       {
 707         if (LocaleCompare("matte",option+1) == 0)
 708           break;
 709         if (LocaleCompare("metric",option+1) == 0)
 710           {
 711             ssize_t
 712               type;
 713
 714             if (*option == '+')
 715               break;
 716             i++;
 717             if (i == (ssize_t) argc)
 718               ThrowCompareException(OptionError,"MissingArgument",option);
 719             type=ParseMagickOption(MagickMetricOptions,MagickTrue,argv[i]);
 720             if (type < 0)
 721               ThrowCompareException(OptionError,"UnrecognizedMetricType",
 722                 argv[i]);
 723             metric=(MetricType) type;
 724             break;
 725           }
 726         if (LocaleCompare("monitor",option+1) == 0)
 727           break;
 728         ThrowCompareException(OptionError,"UnrecognizedOption",option)
 729       }
 730       case 'p':
 731       {
 732         if (LocaleCompare("passphrase",option+1) == 0)
 733           {
 734             if (*option == '+')
 735               break;
 736             i++;
 737             if (i == (ssize_t) argc)
 738               ThrowCompareException(OptionError,"MissingArgument",option);
 739             break;
 740           }
 741         if (LocaleCompare("profile",option+1) == 0)
 742           {
 743             i++;
 744             if (i == (ssize_t) (argc-1))
 745               ThrowCompareException(OptionError,"MissingArgument",option);
 746             break;
 747           }
 748         ThrowCompareException(OptionError,"UnrecognizedOption",option)
 749       }
 750       case 'q':
 751       {
 752         if (LocaleCompare("quality",option+1) == 0)
 753           {
 754             if (*option == '+')
 755               break;
 756             i++;
 757             if (i == (ssize_t) (argc-1))
 758               ThrowCompareException(OptionError,"MissingArgument",option);
 759             if (IsGeometry(argv[i]) == MagickFalse)
 760               ThrowCompareInvalidArgumentException(option,argv[i]);
 761             break;
 762           }
 763         if (LocaleCompare("quantize",option+1) == 0)
 764           {
 765             ssize_t
 766               colorspace;
 767
 768             if (*option == '+')
 769               break;
 770             i++;
 771             if (i == (ssize_t) (argc-1))
 772               ThrowCompareException(OptionError,"MissingArgument",option);
 773             colorspace=ParseMagickOption(MagickColorspaceOptions,
 774               MagickFalse,argv[i]);
 775             if (colorspace < 0)
 776               ThrowCompareException(OptionError,"UnrecognizedColorspace",
 777                 argv[i]);
 778             break;
 779           }
 780         if (LocaleCompare("quiet",option+1) == 0)
 781           break;
 782         ThrowCompareException(OptionError,"UnrecognizedOption",option)
 783       }
 784       case 'r':
 785       {
 786         if (LocaleCompare("regard-warnings",option+1) == 0)
 787           break;
 788         if (LocaleNCompare("respect-parentheses",option+1,17) == 0)
 789           {
 790             respect_parenthesis=(*option == '-') ? MagickTrue : MagickFalse;
 791             break;
 792           }
 793         ThrowCompareException(OptionError,"UnrecognizedOption",option)
 794       }
 795       case 's':
 796       {
 797         if (LocaleCompare("sampling-factor",option+1) == 0)
 798           {
 799             if (*option == '+')
 800               break;
 801             i++;
 802             if (i == (ssize_t) argc)
 803               ThrowCompareException(OptionError,"MissingArgument",option);
 804             if (IsGeometry(argv[i]) == MagickFalse)
 805               ThrowCompareInvalidArgumentException(option,argv[i]);
 806             break;
 807           }
 808         if (LocaleCompare("seed",option+1) == 0)
 809           {
 810             if (*option == '+')
 811               break;
 812             i++;
 813             if (i == (ssize_t) (argc-1))
 814               ThrowCompareException(OptionError,"MissingArgument",option);
 815             if (IsGeometry(argv[i]) == MagickFalse)
 816               ThrowCompareInvalidArgumentException(option,argv[i]);
 817             break;
 818           }
 819         if (LocaleCompare("set",option+1) == 0)
 820           {
 821             i++;
 822             if (i == (ssize_t) argc)
 823               ThrowCompareException(OptionError,"MissingArgument",option);
 824             if (*option == '+')
 825               break;
 826             i++;
 827             if (i == (ssize_t) argc)
 828               ThrowCompareException(OptionError,"MissingArgument",option);
 829             break;
 830           }
 831         if (LocaleCompare("size",option+1) == 0)
 832           {
 833             if (*option == '+')
 834               break;
 835             i++;
 836             if (i == (ssize_t) argc)
 837               ThrowCompareException(OptionError,"MissingArgument",option);
 838             if (IsGeometry(argv[i]) == MagickFalse)
 839               ThrowCompareInvalidArgumentException(option,argv[i]);
 840             break;
 841           }
 842         if (LocaleCompare("subimage-search",option+1) == 0)
 843           {
 844             if (*option == '+')
 845               {
 846                 subimage_search=MagickFalse;
 847                 break;
 848               }
 849             subimage_search=MagickTrue;
 850             break;
 851           }
 852         if (LocaleCompare("synchronize",option+1) == 0)
 853           break;
 854         ThrowCompareException(OptionError,"UnrecognizedOption",option)
 855       }
 856       case 't':
 857       {
 858         if (LocaleCompare("taint",option+1) == 0)
 859           break;
 860         if (LocaleCompare("transparent-color",option+1) == 0)
 861           {
 862             if (*option == '+')
 863               break;
 864             i++;
 865             if (i == (ssize_t) (argc-1))
 866               ThrowCompareException(OptionError,"MissingArgument",option);
 867             break;
 868           }
 869         if (LocaleCompare("type",option+1) == 0)
 870           {
 871             ssize_t
 872               type;
 873
 874             if (*option == '+')
 875               break;
 876             i++;
 877             if (i == (ssize_t) argc)
 878               ThrowCompareException(OptionError,"MissingArgument",option);
 879             type=ParseMagickOption(MagickTypeOptions,MagickFalse,argv[i]);
 880             if (type < 0)
 881               ThrowCompareException(OptionError,"UnrecognizedImageType",
 882                 argv[i]);
 883             break;
 884           }
 885         ThrowCompareException(OptionError,"UnrecognizedOption",option)
 886       }
 887       case 'v':
 888       {
 889         if (LocaleCompare("verbose",option+1) == 0)
 890           break;
 891         if ((LocaleCompare("version",option+1) == 0) ||
 892             (LocaleCompare("-version",option+1) == 0))
 893           {
 894             (void) fprintf(stdout,"Version: %s\n",
 895               GetMagickVersion((size_t *) NULL));
 896             (void) fprintf(stdout,"Copyright: %s\n",GetMagickCopyright());
 897             (void) fprintf(stdout,"Features: %s\n\n",GetMagickFeatures());
 898             break;
 899           }
 900         if (LocaleCompare("virtual-pixel",option+1) == 0)
 901           {
 902             ssize_t
 903               method;
 904
 905             if (*option == '+')
 906               break;
 907             i++;
 908             if (i == (ssize_t) (argc-1))
 909               ThrowCompareException(OptionError,"MissingArgument",option);
 910             method=ParseMagickOption(MagickVirtualPixelOptions,MagickFalse,
 911               argv[i]);
 912             if (method < 0)
 913               ThrowCompareException(OptionError,
 914                 "UnrecognizedVirtualPixelMethod",argv[i]);
 915             break;
 916           }
 917         ThrowCompareException(OptionError,"UnrecognizedOption",option)
 918       }
 919       case '?':
 920         break;
 921       default:
 922         ThrowCompareException(OptionError,"UnrecognizedOption",option)
 923     }
 924     fire=ParseMagickOption(MagickImageListOptions,MagickFalse,option+1) < 0 ?
 925       MagickFalse : MagickTrue;
 926     if (fire != MagickFalse)
 927       FireImageStack(MagickTrue,MagickTrue,MagickTrue);
 928   }
 929   if (k != 0)
 930     ThrowCompareException(OptionError,"UnbalancedParenthesis",argv[i]);
 931   if (i-- != (ssize_t) (argc-1))
 932     ThrowCompareException(OptionError,"MissingAnImageFilename",argv[i]);
 933   if ((image == (Image *) NULL) || (GetImageListLength(image) < 2))
 934     ThrowCompareException(OptionError,"MissingAnImageFilename",argv[i]);
 935   FinalizeImageSettings(image_info,image,MagickTrue);
 936   if ((image == (Image *) NULL) || (GetImageListLength(image) < 2))
 937     ThrowCompareException(OptionError,"MissingAnImageFilename",argv[i]);
 938   image=GetImageFromList(image,0);
 939   reconstruct_image=GetImageFromList(image,1);
 940   if (subimage_search != MagickFalse)
 941     {
 942       similarity_image=SimilarityImage(image,reconstruct_image,&offset,
 943         &similarity_metric,exception);
 944       if (similarity_metric > dissimilarity_threshold)
 945         ThrowCompareException(ImageError,"ImagesTooDissimilar",image->filename);
 946     }
 947   if ((reconstruct_image->columns == image->columns) &&
 948       (reconstruct_image->rows == image->rows))
 949     difference_image=CompareImageChannels(image,reconstruct_image,channels,
 950       metric,&distortion,exception);
 951   else
 952     if (similarity_image == (Image *) NULL)
 953       ThrowCompareException(OptionError,"ImageWidthsOrHeightsDiffer",
 954         image->filename)
 955     else
 956       {
 957         Image
 958           *composite_image;
 959
 960         /*
 961           Determine if reconstructed image is a subimage of the image.
 962         */
 963         composite_image=CloneImage(image,0,0,MagickTrue,exception);
 964         if (composite_image == (Image *) NULL)
 965           difference_image=CompareImageChannels(image,reconstruct_image,
 966             channels,metric,&distortion,exception);
 967         else
 968           {
 969             (void) CompositeImage(composite_image,CopyCompositeOp,
 970               reconstruct_image,offset.x,offset.y);
 971             difference_image=CompareImageChannels(image,composite_image,
 972               channels,metric,&distortion,exception);
 973             if (difference_image != (Image *) NULL)
 974               {
 975                 difference_image->page.x=offset.x;
 976                 difference_image->page.y=offset.y;
 977               }
 978             composite_image=DestroyImage(composite_image);
 979           }
 980         if (difference_image != (Image *) NULL)
 981           {
 982             AppendImageToList(&difference_image,similarity_image);
 983             similarity_image=(Image *) NULL;
 984           }
 985       }
 986   if (difference_image == (Image *) NULL)
 987     status=0;
 988   else
 989     {
 990       if (image_info->verbose != MagickFalse)
 991         (void) IsImagesEqual(image,reconstruct_image);
 992       if (*difference_image->magick == '\0')
 993         (void) CopyMagickString(difference_image->magick,image->magick,
 994           MaxTextExtent);
 995       if (image_info->verbose == MagickFalse)
 996         {
 997           switch (metric)
 998           {
 999             case MeanAbsoluteErrorMetric:
1000             case MeanSquaredErrorMetric:
1001             case RootMeanSquaredErrorMetric:
1002             case PeakAbsoluteErrorMetric:
1003             {
1004               (void) fprintf(stderr,"%g (%g)",QuantumRange*distortion,
1005                 (double) distortion);
1006               if ((reconstruct_image->columns != image->columns) ||
1007                   (reconstruct_image->rows != image->rows))
1008                 (void) fprintf(stderr," @ %.20g,%.20g",(double)
1009                   difference_image->page.x,(double) difference_image->page.y);
1010               (void) fprintf(stderr,"\n");
1011               break;
1012             }
1013             case AbsoluteErrorMetric:
1014             case NormalizedCrossCorrelationErrorMetric:
1015             case PeakSignalToNoiseRatioMetric:
1016             {
1017               (void) fprintf(stderr,"%g",distortion);
1018               if ((reconstruct_image->columns != image->columns) ||
1019                   (reconstruct_image->rows != image->rows))
1020                 (void) fprintf(stderr," @ %.20g,%.20g",(double)
1021                   difference_image->page.x,(double) difference_image->page.y);
1022               (void) fprintf(stderr,"\n");
1023               break;
1024             }
1025             case MeanErrorPerPixelMetric:
1026             {
1027               (void) fprintf(stderr,"%g (%g, %g)",distortion,
1028                 image->error.normalized_mean_error,
1029                 image->error.normalized_maximum_error);
1030               if ((reconstruct_image->columns != image->columns) ||
1031                   (reconstruct_image->rows != image->rows))
1032                 (void) fprintf(stderr," @ %.20g,%.20g",(double)
1033                   difference_image->page.x,(double) difference_image->page.y);
1034               (void) fprintf(stderr,"\n");
1035               break;
1036             }
1037             case UndefinedMetric:
1038               break;
1039           }
1040         }
1041       else
1042         {
1043           double
1044             *channel_distortion;
1045
1046           channel_distortion=GetImageChannelDistortions(image,reconstruct_image,
1047             metric,&image->exception);
1048           (void) fprintf(stderr,"Image: %s\n",image->filename);
1049           if ((reconstruct_image->columns != image->columns) ||
1050               (reconstruct_image->rows != image->rows))
1051             (void) fprintf(stderr,"Offset: %.20g,%.20g\n",(double)
1052               difference_image->page.x,(double) difference_image->page.y);
1053           (void) fprintf(stderr,"  Channel distortion: %s\n",
1054             MagickOptionToMnemonic(MagickMetricOptions,(ssize_t) metric));
1055           switch (metric)
1056           {
1057             case MeanAbsoluteErrorMetric:
1058             case MeanSquaredErrorMetric:
1059             case RootMeanSquaredErrorMetric:
1060             case PeakAbsoluteErrorMetric:
1061             {
1062               switch (image->colorspace)
1063               {
1064                 case RGBColorspace:
1065                 default:
1066                 {
1067                   (void) fprintf(stderr,"    red: %g (%g)\n",
1068                     QuantumRange*channel_distortion[RedChannel],
1069                     channel_distortion[RedChannel]);
1070                   (void) fprintf(stderr,"    green: %g (%g)\n",
1071                     QuantumRange*channel_distortion[GreenChannel],
1072                     channel_distortion[GreenChannel]);
1073                   (void) fprintf(stderr,"    blue: %g (%g)\n",
1074                     QuantumRange*channel_distortion[BlueChannel],
1075                     channel_distortion[BlueChannel]);
1076                   if (image->matte != MagickFalse)
1077                     (void) fprintf(stderr,"    alpha: %g (%g)\n",
1078                       QuantumRange*channel_distortion[OpacityChannel],
1079                       channel_distortion[OpacityChannel]);
1080                   break;
1081                 }
1082                 case CMYKColorspace:
1083                 {
1084                   (void) fprintf(stderr,"    cyan: %g (%g)\n",
1085                     QuantumRange*channel_distortion[CyanChannel],
1086                     channel_distortion[CyanChannel]);
1087                   (void) fprintf(stderr,"    magenta: %g (%g)\n",
1088                     QuantumRange*channel_distortion[MagentaChannel],
1089                     channel_distortion[MagentaChannel]);
1090                   (void) fprintf(stderr,"    yellow: %g (%g)\n",
1091                     QuantumRange*channel_distortion[YellowChannel],
1092                     channel_distortion[YellowChannel]);
1093                   (void) fprintf(stderr,"    black: %g (%g)\n",
1094                     QuantumRange*channel_distortion[BlackChannel],
1095                     channel_distortion[BlackChannel]);
1096                   if (image->matte != MagickFalse)
1097                     (void) fprintf(stderr,"    alpha: %g (%g)\n",
1098                       QuantumRange*channel_distortion[OpacityChannel],
1099                       channel_distortion[OpacityChannel]);
1100                   break;
1101                 }
1102                 case GRAYColorspace:
1103                 {
1104                   (void) fprintf(stderr,"    gray: %g (%g)\n",
1105                     QuantumRange*channel_distortion[GrayChannel],
1106                     channel_distortion[GrayChannel]);
1107                   if (image->matte != MagickFalse)
1108                     (void) fprintf(stderr,"    alpha: %g (%g)\n",
1109                       QuantumRange*channel_distortion[OpacityChannel],
1110                       channel_distortion[OpacityChannel]);
1111                   break;
1112                 }
1113               }
1114               (void) fprintf(stderr,"    all: %g (%g)\n",
1115                 QuantumRange*channel_distortion[AllChannels],
1116                 channel_distortion[AllChannels]);
1117               break;
1118             }
1119             case AbsoluteErrorMetric:
1120             case NormalizedCrossCorrelationErrorMetric:
1121             case PeakSignalToNoiseRatioMetric:
1122             {
1123               switch (image->colorspace)
1124               {
1125                 case RGBColorspace:
1126                 default:
1127                 {
1128                   (void) fprintf(stderr,"    red: %g\n",
1129                     channel_distortion[RedChannel]);
1130                   (void) fprintf(stderr,"    green: %g\n",
1131                     channel_distortion[GreenChannel]);
1132                   (void) fprintf(stderr,"    blue: %g\n",
1133                     channel_distortion[BlueChannel]);
1134                   if (image->matte != MagickFalse)
1135                     (void) fprintf(stderr,"    alpha: %g\n",
1136                       channel_distortion[OpacityChannel]);
1137                   break;
1138                 }
1139                 case CMYKColorspace:
1140                 {
1141                   (void) fprintf(stderr,"    cyan: %g\n",
1142                     channel_distortion[CyanChannel]);
1143                   (void) fprintf(stderr,"    magenta: %g\n",
1144                     channel_distortion[MagentaChannel]);
1145                   (void) fprintf(stderr,"    yellow: %g\n",
1146                     channel_distortion[YellowChannel]);
1147                   (void) fprintf(stderr,"    black: %g\n",
1148                     channel_distortion[BlackChannel]);
1149                   if (image->matte != MagickFalse)
1150                     (void) fprintf(stderr,"    alpha: %g\n",
1151                       channel_distortion[OpacityChannel]);
1152                   break;
1153                 }
1154                 case GRAYColorspace:
1155                 {
1156                   (void) fprintf(stderr,"    gray: %g\n",
1157                     channel_distortion[GrayChannel]);
1158                   if (image->matte != MagickFalse)
1159                     (void) fprintf(stderr,"    alpha: %g\n",
1160                       channel_distortion[OpacityChannel]);
1161                   break;
1162                 }
1163               }
1164               (void) fprintf(stderr,"    all: %g\n",
1165                 channel_distortion[AllChannels]);
1166               break;
1167             }
1168             case MeanErrorPerPixelMetric:
1169             {
1170               (void) fprintf(stderr,"    %g (%g, %g)\n",
1171                 channel_distortion[AllChannels],
1172                 image->error.normalized_mean_error,
1173                 image->error.normalized_maximum_error);
1174               break;
1175             }
1176             case UndefinedMetric:
1177               break;
1178           }
1179           channel_distortion=(double *) RelinquishMagickMemory(
1180             channel_distortion);
1181         }
1182       status&=WriteImages(image_info,difference_image,argv[argc-1],exception);
1183       if ((metadata != (char **) NULL) && (format != (char *) NULL))
1184         {
1185           char
1186             *text;
1187
1188           text=InterpretImageProperties(image_info,difference_image,format);
1189           if (text == (char *) NULL)
1190             ThrowCompareException(ResourceLimitError,"MemoryAllocationFailed",
1191               GetExceptionMessage(errno));
1192           (void) ConcatenateString(&(*metadata),text);
1193           (void) ConcatenateString(&(*metadata),"\n");
1194           text=DestroyString(text);
1195         }
1196       difference_image=DestroyImageList(difference_image);
1197     }
1198   DestroyCompare();
1199   return(status != 0 ? MagickTrue : MagickFalse);
1200 }