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

   1 /*
   2 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
   3 %                                                                             %
   4 %                                                                             %
   5 %                                                                             %
   6 %               CCCC   OOO   M   M  PPPP    AAA   RRRR    EEEEE               %
   7 %              C      O   O  MM MM  P   P  A   A  R   R   E                   %
   8 %              C      O   O  M M M  PPPP   AAAAA  RRRR    EEE                 %
   9 %              C      O   O  M   M  P      A   A  R R     E                   %
  10 %               CCCC   OOO   M   M  P      A   A  R  R    EEEEE               %
  11 %                                                                             %
  12 %                                                                             %
  13 %                         Image Comparison Methods                            %
  14 %                                                                             %
  15 %                              Software Design                                %
  16 %                                John Cristy                                  %
  17 %                               December 2003                                 %
  18 %                                                                             %
  19 %                                                                             %
  20 %  Copyright 1999-2012 ImageMagick Studio LLC, a non-profit organization      %
  21 %  dedicated to making software imaging solutions freely available.           %
  22 %                                                                             %
  23 %  You may not use this file except in compliance with the License.  You may  %
  24 %  obtain a copy of the License at                                            %
  25 %                                                                             %
  26 %    http://www.imagemagick.org/script/license.php                            %
  27 %                                                                             %
  28 %  Unless required by applicable law or agreed to in writing, software        %
  29 %  distributed under the License is distributed on an "AS IS" BASIS,          %
  30 %  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.   %
  31 %  See the License for the specific language governing permissions and        %
  32 %  limitations under the License.                                             %
  33 %                                                                             %
  34 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
  35 %
  36 %  Use the compare program to mathematically and visually annotate the
  37 %  difference between an image and its reconstruction.
  38 %
  39 */
  40 \f
  41 /*
  42   Include declarations.
  43 */
  44 #include "MagickWand/studio.h"
  45 #include "MagickWand/MagickWand.h"
  46 #include "MagickWand/mogrify-private.h"
  47 #include "MagickCore/string-private.h"
  48 \f
  49 /*
  50 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
  51 %                                                                             %
  52 %                                                                             %
  53 %                                                                             %
  54 %   C o m p a r e I m a g e C o m m a n d                                     %
  55 %                                                                             %
  56 %                                                                             %
  57 %                                                                             %
  58 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
  59 %
  60 %  CompareImagesCommand() compares two images and returns the difference between
  61 %  them as a distortion metric and as a new image visually annotating their
  62 %  differences.
  63 %
  64 %  The format of the CompareImagesCommand method is:
  65 %
  66 %      MagickBooleanType CompareImagesCommand(ImageInfo *image_info,int argc,
  67 %        char **argv,char **metadata,ExceptionInfo *exception)
  68 %
  69 %  A description of each parameter follows:
  70 %
  71 %    o image_info: the image info.
  72 %
  73 %    o argc: the number of elements in the argument vector.
  74 %
  75 %    o argv: A text array containing the command line arguments.
  76 %
  77 %    o metadata: any metadata is returned here.
  78 %
  79 %    o exception: return any errors or warnings in this structure.
  80 %
  81 */
  82
  83 static MagickBooleanType CompareUsage(void)
  84 {
  85   const char
  86     **p;
  87
  88   static const char
  89     *miscellaneous[]=
  90     {
  91       "-debug events        display copious debugging information",
  92       "-help                print program options",
  93       "-list type           print a list of supported option arguments",
  94       "-log format          format of debugging information",
  95       (char *) NULL
  96     },
  97     *settings[]=
  98     {
  99       "-alpha option        on, activate, off, deactivate, set, opaque, copy",
 100       "                     transparent, extract, background, or shape",
 101       "-authenticate password",
 102       "                     decipher image with this password",
 103       "-channel type        apply option to select image channels",
 104       "-colorspace type     alternate image colorspace",
 105       "-compose operator    set image composite operator",
 106       "-compress type       type of pixel compression when writing the image",
 107       "-decipher filename   convert cipher pixels to plain pixels",
 108       "-define format:option",
 109       "                     define one or more image format options",
 110       "-density geometry    horizontal and vertical density of the image",
 111       "-depth value         image depth",
 112       "-dissimilarity-threshold value",
 113       "                     maximum distortion for (sub)image match",
 114       "-encipher filename   convert plain pixels to cipher pixels",
 115       "-extract geometry    extract area from image",
 116       "-format \"string\"     output formatted image characteristics",
 117       "-fuzz distance       colors within this distance are considered equal",
 118       "-highlight-color color",
 119       "                     empasize pixel differences with this color",
 120       "-identify            identify the format and characteristics of the image",
 121       "-interlace type      type of image interlacing scheme",
 122       "-limit type value    pixel cache resource limit",
 123       "-lowlight-color color",
 124       "                     de-emphasize pixel differences with this color",
 125       "-metric type         measure differences between images with this metric",
 126       "-monitor             monitor progress",
 127       "-passphrase filename get the passphrase from this file",
 128       "-profile filename    add, delete, or apply an image profile",
 129       "-quality value       JPEG/MIFF/PNG compression level",
 130       "-quiet               suppress all warning messages",
 131       "-quantize colorspace reduce colors in this colorspace",
 132       "-regard-warnings     pay attention to warning messages",
 133       "-respect-parentheses settings remain in effect until parenthesis boundary",
 134       "-sampling-factor geometry",
 135       "                     horizontal and vertical sampling factor",
 136       "-seed value          seed a new sequence of pseudo-random numbers",
 137       "-set attribute value set an image attribute",
 138       "-quality value       JPEG/MIFF/PNG compression level",
 139       "-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 CompareImagesCommand(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   double
 213     dissimilarity_threshold,
 214     distortion,
 215     similarity_metric;
 216
 217   Image
 218     *difference_image,
 219     *image,
 220     *reconstruct_image,
 221     *similarity_image;
 222
 223   ImageStack
 224     image_stack[MaxImageStackDepth+1];
 225
 226   MagickBooleanType
 227     fire,
 228     pend,
 229     respect_parenthesis,
 230     subimage_search;
 231
 232   MagickStatusType
 233     status;
 234
 235   MetricType
 236     metric;
 237
 238   RectangleInfo
 239     offset;
 240
 241   register ssize_t
 242     i;
 243
 244   ssize_t
 245     j,
 246     k;
 247
 248   /*
 249     Set defaults.
 250   */
 251   assert(image_info != (ImageInfo *) NULL);
 252   assert(image_info->signature == MagickSignature);
 253   if (image_info->debug != MagickFalse)
 254     (void) LogMagickEvent(TraceEvent,GetMagickModule(),"...");
 255   assert(exception != (ExceptionInfo *) NULL);
 256   if (argc == 2)
 257     {
 258       option=argv[1];
 259       if ((LocaleCompare("version",option+1) == 0) ||
 260           (LocaleCompare("-version",option+1) == 0))
 261         {
 262           (void) FormatLocaleFile(stdout,"Version: %s\n",
 263             GetMagickVersion((size_t *) NULL));
 264           (void) FormatLocaleFile(stdout,"Copyright: %s\n",
 265             GetMagickCopyright());
 266           (void) FormatLocaleFile(stdout,"Features: %s\n\n",
 267             GetMagickFeatures());
 268           return(MagickFalse);
 269         }
 270     }
 271   if (argc < 3)
 272     return(CompareUsage());
 273   difference_image=NewImageList();
 274   similarity_image=NewImageList();
 275   dissimilarity_threshold=DefaultDissimilarityThreshold;
 276   distortion=0.0;
 277   format=(char *) NULL;
 278   j=1;
 279   k=0;
 280   metric=UndefinedMetric;
 281   NewImageStack();
 282   option=(char *) NULL;
 283   pend=MagickFalse;
 284   reconstruct_image=NewImageList();
 285   respect_parenthesis=MagickFalse;
 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 (IsCommandOption(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         images=ReadImages(image_info,filename,exception);
 329         status&=(images != (Image *) NULL) &&
 330           (exception->severity < ErrorException);
 331         if (images == (Image *) NULL)
 332           continue;
 333         AppendImageStack(images);
 334         continue;
 335       }
 336     pend=image != (Image *) NULL ? MagickTrue : MagickFalse;
 337     switch (*(option+1))
 338     {
 339       case 'a':
 340       {
 341         if (LocaleCompare("alpha",option+1) == 0)
 342           {
 343             ssize_t
 344               type;
 345
 346             if (*option == '+')
 347               break;
 348             i++;
 349             if (i == (ssize_t) argc)
 350               ThrowCompareException(OptionError,"MissingArgument",option);
 351             type=ParseCommandOption(MagickAlphaChannelOptions,MagickFalse,argv[i]);
 352             if (type < 0)
 353               ThrowCompareException(OptionError,"UnrecognizedAlphaChannelOption",
 354                 argv[i]);
 355             break;
 356           }
 357         if (LocaleCompare("authenticate",option+1) == 0)
 358           {
 359             if (*option == '+')
 360               break;
 361             i++;
 362             if (i == (ssize_t) argc)
 363               ThrowCompareException(OptionError,"MissingArgument",option);
 364             break;
 365           }
 366         ThrowCompareException(OptionError,"UnrecognizedOption",option);
 367       }
 368       case 'c':
 369       {
 370         if (LocaleCompare("cache",option+1) == 0)
 371           {
 372             if (*option == '+')
 373               break;
 374             i++;
 375             if (i == (ssize_t) argc)
 376               ThrowCompareException(OptionError,"MissingArgument",option);
 377             if (IsGeometry(argv[i]) == MagickFalse)
 378               ThrowCompareInvalidArgumentException(option,argv[i]);
 379             break;
 380           }
 381         if (LocaleCompare("channel",option+1) == 0)
 382           {
 383             ssize_t
 384               channel;
 385
 386             if (*option == '+')
 387               break;
 388             i++;
 389             if (i == (ssize_t) (argc-1))
 390               ThrowCompareException(OptionError,"MissingArgument",option);
 391             channel=ParseChannelOption(argv[i]);
 392             if (channel < 0)
 393               ThrowCompareException(OptionError,"UnrecognizedChannelType",
 394                 argv[i]);
 395             SetPixelChannelMask(image,(ChannelType) channel);
 396             break;
 397           }
 398         if (LocaleCompare("colorspace",option+1) == 0)
 399           {
 400             ssize_t
 401               colorspace;
 402
 403             if (*option == '+')
 404               break;
 405             i++;
 406             if (i == (ssize_t) (argc-1))
 407               ThrowCompareException(OptionError,"MissingArgument",option);
 408             colorspace=ParseCommandOption(MagickColorspaceOptions,MagickFalse,
 409               argv[i]);
 410             if (colorspace < 0)
 411               ThrowCompareException(OptionError,"UnrecognizedColorspace",
 412                 argv[i]);
 413             break;
 414           }
 415         if (LocaleCompare("compose",option+1) == 0)
 416           {
 417             ssize_t
 418               compose;
 419
 420             if (*option == '+')
 421               break;
 422             i++;
 423             if (i == (ssize_t) argc)
 424               ThrowCompareException(OptionError,"MissingArgument",option);
 425             compose=ParseCommandOption(MagickComposeOptions,MagickFalse,
 426               argv[i]);
 427             if (compose < 0)
 428               ThrowCompareException(OptionError,"UnrecognizedComposeOperator",
 429                 argv[i]);
 430             break;
 431           }
 432         if (LocaleCompare("compress",option+1) == 0)
 433           {
 434             ssize_t
 435               compress;
 436
 437             if (*option == '+')
 438               break;
 439             i++;
 440             if (i == (ssize_t) (argc-1))
 441               ThrowCompareException(OptionError,"MissingArgument",option);
 442             compress=ParseCommandOption(MagickCompressOptions,MagickFalse,
 443               argv[i]);
 444             if (compress < 0)
 445               ThrowCompareException(OptionError,"UnrecognizedImageCompression",
 446                 argv[i]);
 447             break;
 448           }
 449         if (LocaleCompare("concurrent",option+1) == 0)
 450           break;
 451         ThrowCompareException(OptionError,"UnrecognizedOption",option)
 452       }
 453       case 'd':
 454       {
 455         if (LocaleCompare("debug",option+1) == 0)
 456           {
 457             LogEventType
 458               event_mask;
 459
 460             if (*option == '+')
 461               break;
 462             i++;
 463             if (i == (ssize_t) argc)
 464               ThrowCompareException(OptionError,"MissingArgument",option);
 465             event_mask=SetLogEventMask(argv[i]);
 466             if (event_mask == UndefinedEvents)
 467               ThrowCompareException(OptionError,"UnrecognizedEventType",
 468                 argv[i]);
 469             break;
 470           }
 471         if (LocaleCompare("decipher",option+1) == 0)
 472           {
 473             if (*option == '+')
 474               break;
 475             i++;
 476             if (i == (ssize_t) (argc-1))
 477               ThrowCompareException(OptionError,"MissingArgument",option);
 478             break;
 479           }
 480         if (LocaleCompare("define",option+1) == 0)
 481           {
 482             i++;
 483             if (i == (ssize_t) argc)
 484               ThrowCompareException(OptionError,"MissingArgument",option);
 485             if (*option == '+')
 486               {
 487                 const char
 488                   *define;
 489
 490                 define=GetImageOption(image_info,argv[i]);
 491                 if (define == (const char *) NULL)
 492                   ThrowCompareException(OptionError,"NoSuchOption",argv[i]);
 493                 break;
 494               }
 495             break;
 496           }
 497         if (LocaleCompare("density",option+1) == 0)
 498           {
 499             if (*option == '+')
 500               break;
 501             i++;
 502             if (i == (ssize_t) argc)
 503               ThrowCompareException(OptionError,"MissingArgument",option);
 504             if (IsGeometry(argv[i]) == MagickFalse)
 505               ThrowCompareInvalidArgumentException(option,argv[i]);
 506             break;
 507           }
 508         if (LocaleCompare("depth",option+1) == 0)
 509           {
 510             if (*option == '+')
 511               break;
 512             i++;
 513             if (i == (ssize_t) argc)
 514               ThrowCompareException(OptionError,"MissingArgument",option);
 515             if (IsGeometry(argv[i]) == MagickFalse)
 516               ThrowCompareInvalidArgumentException(option,argv[i]);
 517             break;
 518           }
 519         if (LocaleCompare("dissimilarity-threshold",option+1) == 0)
 520           {
 521             if (*option == '+')
 522               break;
 523             i++;
 524             if (i == (ssize_t) argc)
 525               ThrowCompareException(OptionError,"MissingArgument",option);
 526             if (IsGeometry(argv[i]) == MagickFalse)
 527               ThrowCompareInvalidArgumentException(option,argv[i]);
 528             if (*option == '+')
 529               dissimilarity_threshold=DefaultDissimilarityThreshold;
 530             else
 531               dissimilarity_threshold=StringToDouble(argv[i],(char **) NULL);
 532             break;
 533           }
 534         if (LocaleCompare("duration",option+1) == 0)
 535           {
 536             if (*option == '+')
 537               break;
 538             i++;
 539             if (i == (ssize_t) (argc-1))
 540               ThrowCompareException(OptionError,"MissingArgument",option);
 541             if (IsGeometry(argv[i]) == MagickFalse)
 542               ThrowCompareInvalidArgumentException(option,argv[i]);
 543             break;
 544           }
 545         ThrowCompareException(OptionError,"UnrecognizedOption",option)
 546       }
 547       case 'e':
 548       {
 549         if (LocaleCompare("encipher",option+1) == 0)
 550           {
 551             if (*option == '+')
 552               break;
 553             i++;
 554             if (i == (ssize_t) (argc-1))
 555               ThrowCompareException(OptionError,"MissingArgument",option);
 556             break;
 557           }
 558         if (LocaleCompare("extract",option+1) == 0)
 559           {
 560             if (*option == '+')
 561               break;
 562             i++;
 563             if (i == (ssize_t) (argc-1))
 564               ThrowCompareException(OptionError,"MissingArgument",option);
 565             if (IsGeometry(argv[i]) == MagickFalse)
 566               ThrowCompareInvalidArgumentException(option,argv[i]);
 567             break;
 568           }
 569         ThrowCompareException(OptionError,"UnrecognizedOption",option)
 570       }
 571       case 'f':
 572       {
 573         if (LocaleCompare("format",option+1) == 0)
 574           {
 575             if (*option == '+')
 576               break;
 577             i++;
 578             if (i == (ssize_t) argc)
 579               ThrowCompareException(OptionError,"MissingArgument",option);
 580             format=argv[i];
 581             break;
 582           }
 583         if (LocaleCompare("fuzz",option+1) == 0)
 584           {
 585             if (*option == '+')
 586               break;
 587             i++;
 588             if (i == (ssize_t) (argc-1))
 589               ThrowCompareException(OptionError,"MissingArgument",option);
 590             if (IsGeometry(argv[i]) == MagickFalse)
 591               ThrowCompareInvalidArgumentException(option,argv[i]);
 592             break;
 593           }
 594         ThrowCompareException(OptionError,"UnrecognizedOption",option)
 595       }
 596       case 'h':
 597       {
 598         if ((LocaleCompare("help",option+1) == 0) ||
 599             (LocaleCompare("-help",option+1) == 0))
 600           return(CompareUsage());
 601         if (LocaleCompare("highlight-color",option+1) == 0)
 602           {
 603             if (*option == '+')
 604               break;
 605             i++;
 606             if (i == (ssize_t) (argc-1))
 607               ThrowCompareException(OptionError,"MissingArgument",option);
 608             break;
 609           }
 610         ThrowCompareException(OptionError,"UnrecognizedOption",option)
 611       }
 612       case 'i':
 613       {
 614         if (LocaleCompare("identify",option+1) == 0)
 615           break;
 616         if (LocaleCompare("interlace",option+1) == 0)
 617           {
 618             ssize_t
 619               interlace;
 620
 621             if (*option == '+')
 622               break;
 623             i++;
 624             if (i == (ssize_t) argc)
 625               ThrowCompareException(OptionError,"MissingArgument",option);
 626             interlace=ParseCommandOption(MagickInterlaceOptions,MagickFalse,
 627               argv[i]);
 628             if (interlace < 0)
 629               ThrowCompareException(OptionError,"UnrecognizedInterlaceType",
 630                 argv[i]);
 631             break;
 632           }
 633         ThrowCompareException(OptionError,"UnrecognizedOption",option)
 634       }
 635       case 'l':
 636       {
 637         if (LocaleCompare("limit",option+1) == 0)
 638           {
 639             char
 640               *p;
 641
 642             double
 643               value;
 644
 645             ssize_t
 646               resource;
 647
 648             if (*option == '+')
 649               break;
 650             i++;
 651             if (i == (ssize_t) argc)
 652               ThrowCompareException(OptionError,"MissingArgument",option);
 653             resource=ParseCommandOption(MagickResourceOptions,MagickFalse,
 654               argv[i]);
 655             if (resource < 0)
 656               ThrowCompareException(OptionError,"UnrecognizedResourceType",
 657                 argv[i]);
 658             i++;
 659             if (i == (ssize_t) argc)
 660               ThrowCompareException(OptionError,"MissingArgument",option);
 661             value=StringToDouble(argv[i],&p);
 662             (void) value;
 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=ParseCommandOption(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=ParseCommandOption(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("profile",option+1) == 0)
 733           {
 734             i++;
 735             if (i == (ssize_t) (argc-1))
 736               ThrowCompareException(OptionError,"MissingArgument",option);
 737             break;
 738           }
 739         ThrowCompareException(OptionError,"UnrecognizedOption",option)
 740       }
 741       case 'q':
 742       {
 743         if (LocaleCompare("quality",option+1) == 0)
 744           {
 745             if (*option == '+')
 746               break;
 747             i++;
 748             if (i == (ssize_t) (argc-1))
 749               ThrowCompareException(OptionError,"MissingArgument",option);
 750             if (IsGeometry(argv[i]) == MagickFalse)
 751               ThrowCompareInvalidArgumentException(option,argv[i]);
 752             break;
 753           }
 754         if (LocaleCompare("quantize",option+1) == 0)
 755           {
 756             ssize_t
 757               colorspace;
 758
 759             if (*option == '+')
 760               break;
 761             i++;
 762             if (i == (ssize_t) (argc-1))
 763               ThrowCompareException(OptionError,"MissingArgument",option);
 764             colorspace=ParseCommandOption(MagickColorspaceOptions,
 765               MagickFalse,argv[i]);
 766             if (colorspace < 0)
 767               ThrowCompareException(OptionError,"UnrecognizedColorspace",
 768                 argv[i]);
 769             break;
 770           }
 771         if (LocaleCompare("quiet",option+1) == 0)
 772           break;
 773         ThrowCompareException(OptionError,"UnrecognizedOption",option)
 774       }
 775       case 'r':
 776       {
 777         if (LocaleCompare("regard-warnings",option+1) == 0)
 778           break;
 779         if (LocaleNCompare("respect-parentheses",option+1,17) == 0)
 780           {
 781             respect_parenthesis=(*option == '-') ? MagickTrue : MagickFalse;
 782             break;
 783           }
 784         ThrowCompareException(OptionError,"UnrecognizedOption",option)
 785       }
 786       case 's':
 787       {
 788         if (LocaleCompare("sampling-factor",option+1) == 0)
 789           {
 790             if (*option == '+')
 791               break;
 792             i++;
 793             if (i == (ssize_t) argc)
 794               ThrowCompareException(OptionError,"MissingArgument",option);
 795             if (IsGeometry(argv[i]) == MagickFalse)
 796               ThrowCompareInvalidArgumentException(option,argv[i]);
 797             break;
 798           }
 799         if (LocaleCompare("seed",option+1) == 0)
 800           {
 801             if (*option == '+')
 802               break;
 803             i++;
 804             if (i == (ssize_t) (argc-1))
 805               ThrowCompareException(OptionError,"MissingArgument",option);
 806             if (IsGeometry(argv[i]) == MagickFalse)
 807               ThrowCompareInvalidArgumentException(option,argv[i]);
 808             break;
 809           }
 810         if (LocaleCompare("set",option+1) == 0)
 811           {
 812             i++;
 813             if (i == (ssize_t) argc)
 814               ThrowCompareException(OptionError,"MissingArgument",option);
 815             if (*option == '+')
 816               break;
 817             i++;
 818             if (i == (ssize_t) argc)
 819               ThrowCompareException(OptionError,"MissingArgument",option);
 820             break;
 821           }
 822         if (LocaleCompare("size",option+1) == 0)
 823           {
 824             if (*option == '+')
 825               break;
 826             i++;
 827             if (i == (ssize_t) argc)
 828               ThrowCompareException(OptionError,"MissingArgument",option);
 829             if (IsGeometry(argv[i]) == MagickFalse)
 830               ThrowCompareInvalidArgumentException(option,argv[i]);
 831             break;
 832           }
 833         if (LocaleCompare("subimage-search",option+1) == 0)
 834           {
 835             if (*option == '+')
 836               {
 837                 subimage_search=MagickFalse;
 838                 break;
 839               }
 840             subimage_search=MagickTrue;
 841             break;
 842           }
 843         if (LocaleCompare("synchronize",option+1) == 0)
 844           break;
 845         ThrowCompareException(OptionError,"UnrecognizedOption",option)
 846       }
 847       case 't':
 848       {
 849         if (LocaleCompare("taint",option+1) == 0)
 850           break;
 851         if (LocaleCompare("transparent-color",option+1) == 0)
 852           {
 853             if (*option == '+')
 854               break;
 855             i++;
 856             if (i == (ssize_t) (argc-1))
 857               ThrowCompareException(OptionError,"MissingArgument",option);
 858             break;
 859           }
 860         if (LocaleCompare("type",option+1) == 0)
 861           {
 862             ssize_t
 863               type;
 864
 865             if (*option == '+')
 866               break;
 867             i++;
 868             if (i == (ssize_t) argc)
 869               ThrowCompareException(OptionError,"MissingArgument",option);
 870             type=ParseCommandOption(MagickTypeOptions,MagickFalse,argv[i]);
 871             if (type < 0)
 872               ThrowCompareException(OptionError,"UnrecognizedImageType",
 873                 argv[i]);
 874             break;
 875           }
 876         ThrowCompareException(OptionError,"UnrecognizedOption",option)
 877       }
 878       case 'v':
 879       {
 880         if (LocaleCompare("verbose",option+1) == 0)
 881           break;
 882         if ((LocaleCompare("version",option+1) == 0) ||
 883             (LocaleCompare("-version",option+1) == 0))
 884           {
 885             (void) FormatLocaleFile(stdout,"Version: %s\n",
 886               GetMagickVersion((size_t *) NULL));
 887             (void) FormatLocaleFile(stdout,"Copyright: %s\n",
 888               GetMagickCopyright());
 889             (void) FormatLocaleFile(stdout,"Features: %s\n\n",
 890               GetMagickFeatures());
 891             break;
 892           }
 893         if (LocaleCompare("virtual-pixel",option+1) == 0)
 894           {
 895             ssize_t
 896               method;
 897
 898             if (*option == '+')
 899               break;
 900             i++;
 901             if (i == (ssize_t) (argc-1))
 902               ThrowCompareException(OptionError,"MissingArgument",option);
 903             method=ParseCommandOption(MagickVirtualPixelOptions,MagickFalse,
 904               argv[i]);
 905             if (method < 0)
 906               ThrowCompareException(OptionError,
 907                 "UnrecognizedVirtualPixelMethod",argv[i]);
 908             break;
 909           }
 910         ThrowCompareException(OptionError,"UnrecognizedOption",option)
 911       }
 912       case '?':
 913         break;
 914       default:
 915         ThrowCompareException(OptionError,"UnrecognizedOption",option)
 916     }
 917     fire=(GetCommandOptionFlags(MagickCommandOptions,MagickFalse,option) &
 918       FireOptionFlag) == 0 ?  MagickFalse : MagickTrue;
 919     if (fire != MagickFalse)
 920       FireImageStack(MagickTrue,MagickTrue,MagickTrue);
 921   }
 922   if (k != 0)
 923     ThrowCompareException(OptionError,"UnbalancedParenthesis",argv[i]);
 924   if (i-- != (ssize_t) (argc-1))
 925     ThrowCompareException(OptionError,"MissingAnImageFilename",argv[i]);
 926   if ((image == (Image *) NULL) || (GetImageListLength(image) < 2))
 927     ThrowCompareException(OptionError,"MissingAnImageFilename",argv[i]);
 928   FinalizeImageSettings(image_info,image,MagickTrue);
 929   if ((image == (Image *) NULL) || (GetImageListLength(image) < 2))
 930     ThrowCompareException(OptionError,"MissingAnImageFilename",argv[i]);
 931   image=GetImageFromList(image,0);
 932   reconstruct_image=GetImageFromList(image,1);
 933   if (subimage_search != MagickFalse)
 934     {
 935       similarity_image=SimilarityImage(image,reconstruct_image,metric,&offset,
 936         &similarity_metric,exception);
 937       if (similarity_metric > dissimilarity_threshold)
 938         ThrowCompareException(ImageError,"ImagesTooDissimilar",image->filename);
 939     }
 940   if ((reconstruct_image->columns == image->columns) &&
 941       (reconstruct_image->rows == image->rows))
 942     difference_image=CompareImages(image,reconstruct_image,metric,&distortion,
 943       exception);
 944   else
 945     if (similarity_image == (Image *) NULL)
 946       ThrowCompareException(OptionError,"ImageWidthsOrHeightsDiffer",
 947         image->filename)
 948     else
 949       {
 950         Image
 951           *composite_image;
 952
 953         /*
 954           Determine if reconstructed image is a subimage of the image.
 955         */
 956         composite_image=CloneImage(image,0,0,MagickTrue,exception);
 957         if (composite_image == (Image *) NULL)
 958           difference_image=CompareImages(image,reconstruct_image,metric,
 959             &distortion,exception);
 960         else
 961           {
 962             (void) CompositeImage(composite_image,reconstruct_image,
 963               CopyCompositeOp,MagickTrue,offset.x,offset.y,exception);
 964             difference_image=CompareImages(image,composite_image,metric,
 965               &distortion,exception);
 966             if (difference_image != (Image *) NULL)
 967               {
 968                 difference_image->page.x=offset.x;
 969                 difference_image->page.y=offset.y;
 970               }
 971             composite_image=DestroyImage(composite_image);
 972           }
 973         if (difference_image != (Image *) NULL)
 974           {
 975             AppendImageToList(&difference_image,similarity_image);
 976             similarity_image=(Image *) NULL;
 977           }
 978       }
 979   if (difference_image == (Image *) NULL)
 980     status=0;
 981   else
 982     {
 983       if (image_info->verbose != MagickFalse)
 984         (void) IsImagesEqual(image,reconstruct_image,exception);
 985       if (*difference_image->magick == '\0')
 986         (void) CopyMagickString(difference_image->magick,image->magick,
 987           MaxTextExtent);
 988       if (image_info->verbose == MagickFalse)
 989         {
 990           switch (metric)
 991           {
 992             case FuzzErrorMetric:
 993             case MeanAbsoluteErrorMetric:
 994             case MeanSquaredErrorMetric:
 995             case RootMeanSquaredErrorMetric:
 996             case PeakAbsoluteErrorMetric:
 997             {
 998               (void) FormatLocaleFile(stderr,"%g (%g)",QuantumRange*distortion,
 999                 (double) distortion);
1000               if ((reconstruct_image->columns != image->columns) ||
1001                   (reconstruct_image->rows != image->rows))
1002                 (void) FormatLocaleFile(stderr," @ %.20g,%.20g",(double)
1003                   difference_image->page.x,(double) difference_image->page.y);
1004               (void) FormatLocaleFile(stderr,"\n");
1005               break;
1006             }
1007             case AbsoluteErrorMetric:
1008             case NormalizedCrossCorrelationErrorMetric:
1009             case PeakSignalToNoiseRatioMetric:
1010             {
1011               (void) FormatLocaleFile(stderr,"%g",distortion);
1012               if ((reconstruct_image->columns != image->columns) ||
1013                   (reconstruct_image->rows != image->rows))
1014                 (void) FormatLocaleFile(stderr," @ %.20g,%.20g",(double)
1015                   difference_image->page.x,(double) difference_image->page.y);
1016               (void) FormatLocaleFile(stderr,"\n");
1017               break;
1018             }
1019             case MeanErrorPerPixelMetric:
1020             {
1021               (void) FormatLocaleFile(stderr,"%g (%g, %g)",distortion,
1022                 image->error.normalized_mean_error,
1023                 image->error.normalized_maximum_error);
1024               if ((reconstruct_image->columns != image->columns) ||
1025                   (reconstruct_image->rows != image->rows))
1026                 (void) FormatLocaleFile(stderr," @ %.20g,%.20g",(double)
1027                   difference_image->page.x,(double) difference_image->page.y);
1028               (void) FormatLocaleFile(stderr,"\n");
1029               break;
1030             }
1031             case UndefinedMetric:
1032               break;
1033           }
1034         }
1035       else
1036         {
1037           double
1038             *channel_distortion;
1039
1040           channel_distortion=GetImageDistortions(image,reconstruct_image,
1041             metric,exception);
1042           (void) FormatLocaleFile(stderr,"Image: %s\n",image->filename);
1043           if ((reconstruct_image->columns != image->columns) ||
1044               (reconstruct_image->rows != image->rows))
1045             (void) FormatLocaleFile(stderr,"Offset: %.20g,%.20g\n",(double)
1046               difference_image->page.x,(double) difference_image->page.y);
1047           (void) FormatLocaleFile(stderr,"  Channel distortion: %s\n",
1048             CommandOptionToMnemonic(MagickMetricOptions,(ssize_t) metric));
1049           switch (metric)
1050           {
1051             case FuzzErrorMetric:
1052             case MeanAbsoluteErrorMetric:
1053             case MeanSquaredErrorMetric:
1054             case RootMeanSquaredErrorMetric:
1055             case PeakAbsoluteErrorMetric:
1056             {
1057               switch (image->colorspace)
1058               {
1059                 case RGBColorspace:
1060                 default:
1061                 {
1062                   (void) FormatLocaleFile(stderr,"    red: %g (%g)\n",
1063                     QuantumRange*channel_distortion[RedPixelChannel],
1064                     channel_distortion[RedPixelChannel]);
1065                   (void) FormatLocaleFile(stderr,"    green: %g (%g)\n",
1066                     QuantumRange*channel_distortion[GreenPixelChannel],
1067                     channel_distortion[GreenPixelChannel]);
1068                   (void) FormatLocaleFile(stderr,"    blue: %g (%g)\n",
1069                     QuantumRange*channel_distortion[BluePixelChannel],
1070                     channel_distortion[BluePixelChannel]);
1071                   if (image->alpha_trait == BlendPixelTrait)
1072                     (void) FormatLocaleFile(stderr,"    alpha: %g (%g)\n",
1073                       QuantumRange*channel_distortion[AlphaPixelChannel],
1074                       channel_distortion[AlphaPixelChannel]);
1075                   break;
1076                 }
1077                 case CMYKColorspace:
1078                 {
1079                   (void) FormatLocaleFile(stderr,"    cyan: %g (%g)\n",
1080                     QuantumRange*channel_distortion[CyanPixelChannel],
1081                     channel_distortion[CyanPixelChannel]);
1082                   (void) FormatLocaleFile(stderr,"    magenta: %g (%g)\n",
1083                     QuantumRange*channel_distortion[MagentaPixelChannel],
1084                     channel_distortion[MagentaPixelChannel]);
1085                   (void) FormatLocaleFile(stderr,"    yellow: %g (%g)\n",
1086                     QuantumRange*channel_distortion[YellowPixelChannel],
1087                     channel_distortion[YellowPixelChannel]);
1088                   (void) FormatLocaleFile(stderr,"    black: %g (%g)\n",
1089                     QuantumRange*channel_distortion[BlackPixelChannel],
1090                     channel_distortion[BlackPixelChannel]);
1091                   if (image->alpha_trait == BlendPixelTrait)
1092                     (void) FormatLocaleFile(stderr,"    alpha: %g (%g)\n",
1093                       QuantumRange*channel_distortion[AlphaPixelChannel],
1094                       channel_distortion[AlphaPixelChannel]);
1095                   break;
1096                 }
1097                 case GRAYColorspace:
1098                 {
1099                   (void) FormatLocaleFile(stderr,"    gray: %g (%g)\n",
1100                     QuantumRange*channel_distortion[GrayPixelChannel],
1101                     channel_distortion[GrayPixelChannel]);
1102                   if (image->alpha_trait == BlendPixelTrait)
1103                     (void) FormatLocaleFile(stderr,"    alpha: %g (%g)\n",
1104                       QuantumRange*channel_distortion[AlphaPixelChannel],
1105                       channel_distortion[AlphaPixelChannel]);
1106                   break;
1107                 }
1108               }
1109               (void) FormatLocaleFile(stderr,"    all: %g (%g)\n",
1110                 QuantumRange*channel_distortion[MaxPixelChannels],
1111                 channel_distortion[MaxPixelChannels]);
1112               break;
1113             }
1114             case AbsoluteErrorMetric:
1115             case NormalizedCrossCorrelationErrorMetric:
1116             case PeakSignalToNoiseRatioMetric:
1117             {
1118               switch (image->colorspace)
1119               {
1120                 case RGBColorspace:
1121                 default:
1122                 {
1123                   (void) FormatLocaleFile(stderr,"    red: %g\n",
1124                     channel_distortion[RedPixelChannel]);
1125                   (void) FormatLocaleFile(stderr,"    green: %g\n",
1126                     channel_distortion[GreenPixelChannel]);
1127                   (void) FormatLocaleFile(stderr,"    blue: %g\n",
1128                     channel_distortion[BluePixelChannel]);
1129                   if (image->alpha_trait == BlendPixelTrait)
1130                     (void) FormatLocaleFile(stderr,"    alpha: %g\n",
1131                       channel_distortion[AlphaPixelChannel]);
1132                   break;
1133                 }
1134                 case CMYKColorspace:
1135                 {
1136                   (void) FormatLocaleFile(stderr,"    cyan: %g\n",
1137                     channel_distortion[CyanPixelChannel]);
1138                   (void) FormatLocaleFile(stderr,"    magenta: %g\n",
1139                     channel_distortion[MagentaPixelChannel]);
1140                   (void) FormatLocaleFile(stderr,"    yellow: %g\n",
1141                     channel_distortion[YellowPixelChannel]);
1142                   (void) FormatLocaleFile(stderr,"    black: %g\n",
1143                     channel_distortion[BlackPixelChannel]);
1144                   if (image->alpha_trait == BlendPixelTrait)
1145                     (void) FormatLocaleFile(stderr,"    alpha: %g\n",
1146                       channel_distortion[AlphaPixelChannel]);
1147                   break;
1148                 }
1149                 case GRAYColorspace:
1150                 {
1151                   (void) FormatLocaleFile(stderr,"    gray: %g\n",
1152                     channel_distortion[GrayPixelChannel]);
1153                   if (image->alpha_trait == BlendPixelTrait)
1154                     (void) FormatLocaleFile(stderr,"    alpha: %g\n",
1155                       channel_distortion[AlphaPixelChannel]);
1156                   break;
1157                 }
1158               }
1159               (void) FormatLocaleFile(stderr,"    all: %g\n",
1160                 channel_distortion[MaxPixelChannels]);
1161               break;
1162             }
1163             case MeanErrorPerPixelMetric:
1164             {
1165               (void) FormatLocaleFile(stderr,"    %g (%g, %g)\n",
1166                 channel_distortion[MaxPixelChannels],
1167                 image->error.normalized_mean_error,
1168                 image->error.normalized_maximum_error);
1169               break;
1170             }
1171             case UndefinedMetric:
1172               break;
1173           }
1174           channel_distortion=(double *) RelinquishMagickMemory(
1175             channel_distortion);
1176         }
1177       status&=WriteImages(image_info,difference_image,argv[argc-1],exception);
1178       if ((metadata != (char **) NULL) && (format != (char *) NULL))
1179         {
1180           char
1181             *text;
1182
1183           text=InterpretImageProperties(image_info,difference_image,format,
1184             exception);
1185           if (text == (char *) NULL)
1186             ThrowCompareException(ResourceLimitError,"MemoryAllocationFailed",
1187               GetExceptionMessage(errno));
1188           (void) ConcatenateString(&(*metadata),text);
1189           (void) ConcatenateString(&(*metadata),"\n");
1190           text=DestroyString(text);
1191         }
1192       difference_image=DestroyImageList(difference_image);
1193     }
1194   DestroyCompare();
1195   return(status != 0 ? MagickTrue : MagickFalse);
1196 }