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             (void) value;
 664             if ((p == argv[i]) && (LocaleCompare("unlimited",argv[i]) != 0))
 665               ThrowCompareInvalidArgumentException(option,argv[i]);
 666             break;
 667           }
 668         if (LocaleCompare("list",option+1) == 0)
 669           {
 670             ssize_t
 671               list;
 672
 673             if (*option == '+')
 674               break;
 675             i++;
 676             if (i == (ssize_t) argc)
 677               ThrowCompareException(OptionError,"MissingArgument",option);
 678             list=ParseMagickOption(MagickListOptions,MagickFalse,argv[i]);
 679             if (list < 0)
 680               ThrowCompareException(OptionError,"UnrecognizedListType",argv[i]);
 681             status=MogrifyImageInfo(image_info,(int) (i-j+1),(const char **)
 682               argv+j,exception);
 683             DestroyCompare();
 684             return(status != 0 ? MagickFalse : MagickTrue);
 685           }
 686         if (LocaleCompare("log",option+1) == 0)
 687           {
 688             if (*option == '+')
 689               break;
 690             i++;
 691             if ((i == (ssize_t) argc) || (strchr(argv[i],'%') == (char *) NULL))
 692               ThrowCompareException(OptionError,"MissingArgument",option);
 693             break;
 694           }
 695         if (LocaleCompare("lowlight-color",option+1) == 0)
 696           {
 697             if (*option == '+')
 698               break;
 699             i++;
 700             if (i == (ssize_t) (argc-1))
 701               ThrowCompareException(OptionError,"MissingArgument",option);
 702             break;
 703           }
 704         ThrowCompareException(OptionError,"UnrecognizedOption",option)
 705       }
 706       case 'm':
 707       {
 708         if (LocaleCompare("matte",option+1) == 0)
 709           break;
 710         if (LocaleCompare("metric",option+1) == 0)
 711           {
 712             ssize_t
 713               type;
 714
 715             if (*option == '+')
 716               break;
 717             i++;
 718             if (i == (ssize_t) argc)
 719               ThrowCompareException(OptionError,"MissingArgument",option);
 720             type=ParseMagickOption(MagickMetricOptions,MagickTrue,argv[i]);
 721             if (type < 0)
 722               ThrowCompareException(OptionError,"UnrecognizedMetricType",
 723                 argv[i]);
 724             metric=(MetricType) type;
 725             break;
 726           }
 727         if (LocaleCompare("monitor",option+1) == 0)
 728           break;
 729         ThrowCompareException(OptionError,"UnrecognizedOption",option)
 730       }
 731       case 'p':
 732       {
 733         if (LocaleCompare("passphrase",option+1) == 0)
 734           {
 735             if (*option == '+')
 736               break;
 737             i++;
 738             if (i == (ssize_t) argc)
 739               ThrowCompareException(OptionError,"MissingArgument",option);
 740             break;
 741           }
 742         if (LocaleCompare("profile",option+1) == 0)
 743           {
 744             i++;
 745             if (i == (ssize_t) (argc-1))
 746               ThrowCompareException(OptionError,"MissingArgument",option);
 747             break;
 748           }
 749         ThrowCompareException(OptionError,"UnrecognizedOption",option)
 750       }
 751       case 'q':
 752       {
 753         if (LocaleCompare("quality",option+1) == 0)
 754           {
 755             if (*option == '+')
 756               break;
 757             i++;
 758             if (i == (ssize_t) (argc-1))
 759               ThrowCompareException(OptionError,"MissingArgument",option);
 760             if (IsGeometry(argv[i]) == MagickFalse)
 761               ThrowCompareInvalidArgumentException(option,argv[i]);
 762             break;
 763           }
 764         if (LocaleCompare("quantize",option+1) == 0)
 765           {
 766             ssize_t
 767               colorspace;
 768
 769             if (*option == '+')
 770               break;
 771             i++;
 772             if (i == (ssize_t) (argc-1))
 773               ThrowCompareException(OptionError,"MissingArgument",option);
 774             colorspace=ParseMagickOption(MagickColorspaceOptions,
 775               MagickFalse,argv[i]);
 776             if (colorspace < 0)
 777               ThrowCompareException(OptionError,"UnrecognizedColorspace",
 778                 argv[i]);
 779             break;
 780           }
 781         if (LocaleCompare("quiet",option+1) == 0)
 782           break;
 783         ThrowCompareException(OptionError,"UnrecognizedOption",option)
 784       }
 785       case 'r':
 786       {
 787         if (LocaleCompare("regard-warnings",option+1) == 0)
 788           break;
 789         if (LocaleNCompare("respect-parentheses",option+1,17) == 0)
 790           {
 791             respect_parenthesis=(*option == '-') ? MagickTrue : MagickFalse;
 792             break;
 793           }
 794         ThrowCompareException(OptionError,"UnrecognizedOption",option)
 795       }
 796       case 's':
 797       {
 798         if (LocaleCompare("sampling-factor",option+1) == 0)
 799           {
 800             if (*option == '+')
 801               break;
 802             i++;
 803             if (i == (ssize_t) argc)
 804               ThrowCompareException(OptionError,"MissingArgument",option);
 805             if (IsGeometry(argv[i]) == MagickFalse)
 806               ThrowCompareInvalidArgumentException(option,argv[i]);
 807             break;
 808           }
 809         if (LocaleCompare("seed",option+1) == 0)
 810           {
 811             if (*option == '+')
 812               break;
 813             i++;
 814             if (i == (ssize_t) (argc-1))
 815               ThrowCompareException(OptionError,"MissingArgument",option);
 816             if (IsGeometry(argv[i]) == MagickFalse)
 817               ThrowCompareInvalidArgumentException(option,argv[i]);
 818             break;
 819           }
 820         if (LocaleCompare("set",option+1) == 0)
 821           {
 822             i++;
 823             if (i == (ssize_t) argc)
 824               ThrowCompareException(OptionError,"MissingArgument",option);
 825             if (*option == '+')
 826               break;
 827             i++;
 828             if (i == (ssize_t) argc)
 829               ThrowCompareException(OptionError,"MissingArgument",option);
 830             break;
 831           }
 832         if (LocaleCompare("size",option+1) == 0)
 833           {
 834             if (*option == '+')
 835               break;
 836             i++;
 837             if (i == (ssize_t) argc)
 838               ThrowCompareException(OptionError,"MissingArgument",option);
 839             if (IsGeometry(argv[i]) == MagickFalse)
 840               ThrowCompareInvalidArgumentException(option,argv[i]);
 841             break;
 842           }
 843         if (LocaleCompare("subimage-search",option+1) == 0)
 844           {
 845             if (*option == '+')
 846               {
 847                 subimage_search=MagickFalse;
 848                 break;
 849               }
 850             subimage_search=MagickTrue;
 851             break;
 852           }
 853         if (LocaleCompare("synchronize",option+1) == 0)
 854           break;
 855         ThrowCompareException(OptionError,"UnrecognizedOption",option)
 856       }
 857       case 't':
 858       {
 859         if (LocaleCompare("taint",option+1) == 0)
 860           break;
 861         if (LocaleCompare("transparent-color",option+1) == 0)
 862           {
 863             if (*option == '+')
 864               break;
 865             i++;
 866             if (i == (ssize_t) (argc-1))
 867               ThrowCompareException(OptionError,"MissingArgument",option);
 868             break;
 869           }
 870         if (LocaleCompare("type",option+1) == 0)
 871           {
 872             ssize_t
 873               type;
 874
 875             if (*option == '+')
 876               break;
 877             i++;
 878             if (i == (ssize_t) argc)
 879               ThrowCompareException(OptionError,"MissingArgument",option);
 880             type=ParseMagickOption(MagickTypeOptions,MagickFalse,argv[i]);
 881             if (type < 0)
 882               ThrowCompareException(OptionError,"UnrecognizedImageType",
 883                 argv[i]);
 884             break;
 885           }
 886         ThrowCompareException(OptionError,"UnrecognizedOption",option)
 887       }
 888       case 'v':
 889       {
 890         if (LocaleCompare("verbose",option+1) == 0)
 891           break;
 892         if ((LocaleCompare("version",option+1) == 0) ||
 893             (LocaleCompare("-version",option+1) == 0))
 894           {
 895             (void) fprintf(stdout,"Version: %s\n",
 896               GetMagickVersion((size_t *) NULL));
 897             (void) fprintf(stdout,"Copyright: %s\n",GetMagickCopyright());
 898             (void) fprintf(stdout,"Features: %s\n\n",GetMagickFeatures());
 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=ParseMagickOption(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=ParseMagickOption(MagickImageListOptions,MagickFalse,option+1) < 0 ?
 926       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,&offset,
 944         &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=CompareImageChannels(image,reconstruct_image,channels,
 951       metric,&distortion,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=CompareImageChannels(image,reconstruct_image,
 967             channels,metric,&distortion,exception);
 968         else
 969           {
 970             (void) CompositeImage(composite_image,CopyCompositeOp,
 971               reconstruct_image,offset.x,offset.y);
 972             difference_image=CompareImageChannels(image,composite_image,
 973               channels,metric,&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);
 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) fprintf(stderr,"%g (%g)",QuantumRange*distortion,
1007                 (double) distortion);
1008               if ((reconstruct_image->columns != image->columns) ||
1009                   (reconstruct_image->rows != image->rows))
1010                 (void) fprintf(stderr," @ %.20g,%.20g",(double)
1011                   difference_image->page.x,(double) difference_image->page.y);
1012               (void) fprintf(stderr,"\n");
1013               break;
1014             }
1015             case AbsoluteErrorMetric:
1016             case NormalizedCrossCorrelationErrorMetric:
1017             case PeakSignalToNoiseRatioMetric:
1018             {
1019               (void) fprintf(stderr,"%g",distortion);
1020               if ((reconstruct_image->columns != image->columns) ||
1021                   (reconstruct_image->rows != image->rows))
1022                 (void) fprintf(stderr," @ %.20g,%.20g",(double)
1023                   difference_image->page.x,(double) difference_image->page.y);
1024               (void) fprintf(stderr,"\n");
1025               break;
1026             }
1027             case MeanErrorPerPixelMetric:
1028             {
1029               (void) fprintf(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) fprintf(stderr," @ %.20g,%.20g",(double)
1035                   difference_image->page.x,(double) difference_image->page.y);
1036               (void) fprintf(stderr,"\n");
1037               break;
1038             }
1039             case UndefinedMetric:
1040               break;
1041           }
1042         }
1043       else
1044         {
1045           double
1046             *channel_distortion;
1047
1048           channel_distortion=GetImageChannelDistortions(image,reconstruct_image,
1049             metric,&image->exception);
1050           (void) fprintf(stderr,"Image: %s\n",image->filename);
1051           if ((reconstruct_image->columns != image->columns) ||
1052               (reconstruct_image->rows != image->rows))
1053             (void) fprintf(stderr,"Offset: %.20g,%.20g\n",(double)
1054               difference_image->page.x,(double) difference_image->page.y);
1055           (void) fprintf(stderr,"  Channel distortion: %s\n",
1056             MagickOptionToMnemonic(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) fprintf(stderr,"    red: %g (%g)\n",
1071                     QuantumRange*channel_distortion[RedChannel],
1072                     channel_distortion[RedChannel]);
1073                   (void) fprintf(stderr,"    green: %g (%g)\n",
1074                     QuantumRange*channel_distortion[GreenChannel],
1075                     channel_distortion[GreenChannel]);
1076                   (void) fprintf(stderr,"    blue: %g (%g)\n",
1077                     QuantumRange*channel_distortion[BlueChannel],
1078                     channel_distortion[BlueChannel]);
1079                   if (image->matte != MagickFalse)
1080                     (void) fprintf(stderr,"    alpha: %g (%g)\n",
1081                       QuantumRange*channel_distortion[OpacityChannel],
1082                       channel_distortion[OpacityChannel]);
1083                   break;
1084                 }
1085                 case CMYKColorspace:
1086                 {
1087                   (void) fprintf(stderr,"    cyan: %g (%g)\n",
1088                     QuantumRange*channel_distortion[CyanChannel],
1089                     channel_distortion[CyanChannel]);
1090                   (void) fprintf(stderr,"    magenta: %g (%g)\n",
1091                     QuantumRange*channel_distortion[MagentaChannel],
1092                     channel_distortion[MagentaChannel]);
1093                   (void) fprintf(stderr,"    yellow: %g (%g)\n",
1094                     QuantumRange*channel_distortion[YellowChannel],
1095                     channel_distortion[YellowChannel]);
1096                   (void) fprintf(stderr,"    black: %g (%g)\n",
1097                     QuantumRange*channel_distortion[BlackChannel],
1098                     channel_distortion[BlackChannel]);
1099                   if (image->matte != MagickFalse)
1100                     (void) fprintf(stderr,"    alpha: %g (%g)\n",
1101                       QuantumRange*channel_distortion[OpacityChannel],
1102                       channel_distortion[OpacityChannel]);
1103                   break;
1104                 }
1105                 case GRAYColorspace:
1106                 {
1107                   (void) fprintf(stderr,"    gray: %g (%g)\n",
1108                     QuantumRange*channel_distortion[GrayChannel],
1109                     channel_distortion[GrayChannel]);
1110                   if (image->matte != MagickFalse)
1111                     (void) fprintf(stderr,"    alpha: %g (%g)\n",
1112                       QuantumRange*channel_distortion[OpacityChannel],
1113                       channel_distortion[OpacityChannel]);
1114                   break;
1115                 }
1116               }
1117               (void) fprintf(stderr,"    all: %g (%g)\n",
1118                 QuantumRange*channel_distortion[AllChannels],
1119                 channel_distortion[AllChannels]);
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) fprintf(stderr,"    red: %g\n",
1132                     channel_distortion[RedChannel]);
1133                   (void) fprintf(stderr,"    green: %g\n",
1134                     channel_distortion[GreenChannel]);
1135                   (void) fprintf(stderr,"    blue: %g\n",
1136                     channel_distortion[BlueChannel]);
1137                   if (image->matte != MagickFalse)
1138                     (void) fprintf(stderr,"    alpha: %g\n",
1139                       channel_distortion[OpacityChannel]);
1140                   break;
1141                 }
1142                 case CMYKColorspace:
1143                 {
1144                   (void) fprintf(stderr,"    cyan: %g\n",
1145                     channel_distortion[CyanChannel]);
1146                   (void) fprintf(stderr,"    magenta: %g\n",
1147                     channel_distortion[MagentaChannel]);
1148                   (void) fprintf(stderr,"    yellow: %g\n",
1149                     channel_distortion[YellowChannel]);
1150                   (void) fprintf(stderr,"    black: %g\n",
1151                     channel_distortion[BlackChannel]);
1152                   if (image->matte != MagickFalse)
1153                     (void) fprintf(stderr,"    alpha: %g\n",
1154                       channel_distortion[OpacityChannel]);
1155                   break;
1156                 }
1157                 case GRAYColorspace:
1158                 {
1159                   (void) fprintf(stderr,"    gray: %g\n",
1160                     channel_distortion[GrayChannel]);
1161                   if (image->matte != MagickFalse)
1162                     (void) fprintf(stderr,"    alpha: %g\n",
1163                       channel_distortion[OpacityChannel]);
1164                   break;
1165                 }
1166               }
1167               (void) fprintf(stderr,"    all: %g\n",
1168                 channel_distortion[AllChannels]);
1169               break;
1170             }
1171             case MeanErrorPerPixelMetric:
1172             {
1173               (void) fprintf(stderr,"    %g (%g, %g)\n",
1174                 channel_distortion[AllChannels],
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           if (text == (char *) NULL)
1193             ThrowCompareException(ResourceLimitError,"MemoryAllocationFailed",
1194               GetExceptionMessage(errno));
1195           (void) ConcatenateString(&(*metadata),text);
1196           (void) ConcatenateString(&(*metadata),"\n");
1197           text=DestroyString(text);
1198         }
1199       difference_image=DestroyImageList(difference_image);
1200     }
1201   DestroyCompare();
1202   return(status != 0 ? MagickTrue : MagickFalse);
1203 }