MagickWand/compare.c

/*
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%               CCCC   OOO   M   M  PPPP    AAA   RRRR    EEEEE               %
%              C      O   O  MM MM  P   P  A   A  R   R   E                   %
%              C      O   O  M M M  PPPP   AAAAA  RRRR    EEE                 %
%              C      O   O  M   M  P      A   A  R R     E                   %
%               CCCC   OOO   M   M  P      A   A  R  R    EEEEE               %
%                                                                             %
%                                                                             %
%                         Image Comparison Methods                            %
%                                                                             %
%                              Software Design                                %
%                                   Cristy                                    %
%                               December 2003                                 %
%                                                                             %
%                                                                             %
%  Copyright 1999-2016 ImageMagick Studio LLC, a non-profit organization      %
%  dedicated to making software imaging solutions freely available.           %
%                                                                             %
%  You may not use this file except in compliance with the License.  You may  %
%  obtain a copy of the License at                                            %
%                                                                             %
%    http://www.imagemagick.org/script/license.php                            %
%                                                                             %
%  Unless required by applicable law or agreed to in writing, software        %
%  distributed under the License is distributed on an "AS IS" BASIS,          %
%  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.   %
%  See the License for the specific language governing permissions and        %
%  limitations under the License.                                             %
%                                                                             %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
%  Use the compare program to mathematically and visually annotate the
%  difference between an image and its reconstruction.
%
*/

/*
  Include declarations.
*/
#include "MagickWand/studio.h"
#include "MagickWand/MagickWand.h"
#include "MagickWand/mogrify-private.h"
#include "MagickCore/string-private.h"

/*
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%   C o m p a r e I m a g e C o m m a n d                                     %
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
%  CompareImagesCommand() compares two images and returns the difference between
%  them as a distortion metric and as a new image visually annotating their
%  differences.
%
%  The format of the CompareImagesCommand method is:
%
%      MagickBooleanType CompareImagesCommand(ImageInfo *image_info,int argc,
%        char **argv,char **metadata,ExceptionInfo *exception)
%
%  A description of each parameter follows:
%
%    o image_info: the image info.
%
%    o argc: the number of elements in the argument vector.
%
%    o argv: A text array containing the command line arguments.
%
%    o metadata: any metadata is returned here.
%
%    o exception: return any errors or warnings in this structure.
%
*/

static MagickBooleanType CompareUsage(void)
{
  const char
    **p;

  static const char
    *miscellaneous[]=
    {
      "-channel mask        set the image channel mask",
      "-debug events        display copious debugging information",
      "-help                print program options",
      "-list type           print a list of supported option arguments",
      "-log format          format of debugging information",
      (char *) NULL
    },
    *settings[]=
    {
      "-alpha option        on, activate, off, deactivate, set, opaque, copy",
      "                     transparent, extract, background, or shape",
      "-authenticate password",
      "                     decipher image with this password",
      "-colorspace type     alternate image colorspace",
      "-compose operator    set image composite operator",
      "-compress type       type of pixel compression when writing the image",
      "-decipher filename   convert cipher pixels to plain pixels",
      "-define format:option",
      "                     define one or more image format options",
      "-density geometry    horizontal and vertical density of the image",
      "-depth value         image depth",
      "-dissimilarity-threshold value",
      "                     maximum distortion for (sub)image match",
      "-encipher filename   convert plain pixels to cipher pixels",
      "-extract geometry    extract area from image",
      "-format \"string\"     output formatted image characteristics",
      "-fuzz distance       colors within this distance are considered equal",
      "-highlight-color color",
      "                     empasize pixel differences with this color",
      "-identify            identify the format and characteristics of the image",
      "-interlace type      type of image interlacing scheme",
      "-limit type value    pixel cache resource limit",
      "-lowlight-color color",
      "                     de-emphasize pixel differences with this color",
      "-metric type         measure differences between images with this metric",
      "-monitor             monitor progress",
      "-profile filename    add, delete, or apply an image profile",
      "-quality value       JPEG/MIFF/PNG compression level",
      "-quiet               suppress all warning messages",
      "-quantize colorspace reduce colors in this colorspace",
      "-regard-warnings     pay attention to warning messages",
      "-respect-parentheses settings remain in effect until parenthesis boundary",
      "-sampling-factor geometry",
      "                     horizontal and vertical sampling factor",
      "-seed value          seed a new sequence of pseudo-random numbers",
      "-set attribute value set an image attribute",
      "-quality value       JPEG/MIFF/PNG compression level",
      "-similarity-threshold value",
      "                     minimum distortion for (sub)image match",
      "-size geometry       width and height of image",
      "-subimage-search     search for subimage",
      "-synchronize         synchronize image to storage device",
      "-taint               declare the image as modified",
      "-transparent-color color",
      "                     transparent color",
      "-type type           image type",
      "-verbose             print detailed information about the image",
      "-version             print version information",
      "-virtual-pixel method",
      "                     virtual pixel access method",
      (char *) NULL
    };

  ListMagickVersion(stdout);
  (void) printf("Usage: %s [options ...] image reconstruct difference\n",
    GetClientName());
  (void) printf("\nImage Settings:\n");
  for (p=settings; *p != (char *) NULL; p++)
    (void) printf("  %s\n",*p);
  (void) printf("\nMiscellaneous Options:\n");
  for (p=miscellaneous; *p != (char *) NULL; p++)
    (void) printf("  %s\n",*p);
  (void) printf(
    "\nBy default, the image format of 'file' is determined by its magic\n");
  (void) printf(
    "number.  To specify a particular image format, precede the filename\n");
  (void) printf(
    "with an image format name and a colon (i.e. ps:image) or specify the\n");
  (void) printf(
    "image type as the filename suffix (i.e. image.ps).  Specify 'file' as\n");
  (void) printf("'-' for standard input or output.\n");
  return(MagickFalse);
}

WandExport MagickBooleanType CompareImagesCommand(ImageInfo *image_info,
  int argc,char **argv,char **metadata,ExceptionInfo *exception)
{
#define CompareEpsilon  (1.0e-06)
#define DefaultDissimilarityThreshold  0.31830988618379067154
#define DefaultSimilarityThreshold  (-1.0)
#define DestroyCompare() \
{ \
  if (similarity_image != (Image *) NULL) \
    similarity_image=DestroyImageList(similarity_image); \
  if (difference_image != (Image *) NULL) \
    difference_image=DestroyImageList(difference_image); \
  DestroyImageStack(); \
  for (i=0; i < (ssize_t) argc; i++) \
    argv[i]=DestroyString(argv[i]); \
  argv=(char **) RelinquishMagickMemory(argv); \
}
#define ThrowCompareException(asperity,tag,option) \
{ \
  if (exception->severity < (asperity)) \
    (void) ThrowMagickException(exception,GetMagickModule(),asperity,tag, \
      "`%s'",option); \
  DestroyCompare(); \
  return(MagickFalse); \
}
#define ThrowCompareInvalidArgumentException(option,argument) \
{ \
  (void) ThrowMagickException(exception,GetMagickModule(),OptionError, \
    "InvalidArgument","'%s': %s",option,argument); \
  DestroyCompare(); \
  return(MagickFalse); \
}

  char
    *filename,
    *option;

  const char
    *format;

  double
    dissimilarity_threshold,
    distortion,
    similarity_metric,
    similarity_threshold;

  Image
    *difference_image,
    *image,
    *reconstruct_image,
    *similarity_image;

  ImageStack
    image_stack[MaxImageStackDepth+1];

  MagickBooleanType
    fire,
    pend,
    respect_parenthesis,
    subimage_search;

  MagickStatusType
    status;

  MetricType
    metric;

  RectangleInfo
    offset;

  register ssize_t
    i;

  ssize_t
    j,
    k;

  /*
    Set defaults.
  */
  assert(image_info != (ImageInfo *) NULL);
  assert(image_info->signature == MagickCoreSignature);
  if (image_info->debug != MagickFalse)
    (void) LogMagickEvent(TraceEvent,GetMagickModule(),"...");
  assert(exception != (ExceptionInfo *) NULL);
  if (argc == 2)
    {
      option=argv[1];
      if ((LocaleCompare("version",option+1) == 0) ||
          (LocaleCompare("-version",option+1) == 0))
        {
          ListMagickVersion(stdout);
          return(MagickFalse);
        }
    }
  if (argc < 3)
    return(CompareUsage());
  difference_image=NewImageList();
  similarity_image=NewImageList();
  dissimilarity_threshold=DefaultDissimilarityThreshold;
  similarity_threshold=DefaultSimilarityThreshold;
  distortion=0.0;
  format=(char *) NULL;
  j=1;
  k=0;
  metric=UndefinedErrorMetric;
  NewImageStack();
  option=(char *) NULL;
  pend=MagickFalse;
  reconstruct_image=NewImageList();
  respect_parenthesis=MagickFalse;
  status=MagickTrue;
  subimage_search=MagickFalse;
  /*
    Compare an image.
  */
  ReadCommandlLine(argc,&argv);
  status=ExpandFilenames(&argc,&argv);
  if (status == MagickFalse)
    ThrowCompareException(ResourceLimitError,"MemoryAllocationFailed",
      GetExceptionMessage(errno));
  for (i=1; i < (ssize_t) (argc-1); i++)
  {
    option=argv[i];
    if (LocaleCompare(option,"(") == 0)
      {
        FireImageStack(MagickTrue,MagickTrue,pend);
        if (k == MaxImageStackDepth)
          ThrowCompareException(OptionError,"ParenthesisNestedTooDeeply",
            option);
        PushImageStack();
        continue;
      }
    if (LocaleCompare(option,")") == 0)
      {
        FireImageStack(MagickTrue,MagickTrue,MagickTrue);
        if (k == 0)
          ThrowCompareException(OptionError,"UnableToParseExpression",option);
        PopImageStack();
        continue;
      }
    if (IsCommandOption(option) == MagickFalse)
      {
        Image
          *images;

        /*
          Read input image.
        */
        FireImageStack(MagickFalse,MagickFalse,pend);
        filename=argv[i];
        if ((LocaleCompare(filename,"--") == 0) && (i < (ssize_t) (argc-1)))
          filename=argv[++i];
        images=ReadImages(image_info,filename,exception);
        status&=(images != (Image *) NULL) &&
          (exception->severity < ErrorException);
        if (images == (Image *) NULL)
          continue;
        AppendImageStack(images);
        continue;
      }
    pend=image != (Image *) NULL ? MagickTrue : MagickFalse;
    switch (*(option+1))
    {
      case 'a':
      {
        if (LocaleCompare("alpha",option+1) == 0)
          {
            ssize_t
              type;

            if (*option == '+')
              break;
            i++;
            if (i == (ssize_t) argc)
              ThrowCompareException(OptionError,"MissingArgument",option);
            type=ParseCommandOption(MagickAlphaChannelOptions,MagickFalse,argv[i]);
            if (type < 0)
              ThrowCompareException(OptionError,"UnrecognizedAlphaChannelOption",
                argv[i]);
            break;
          }
        if (LocaleCompare("authenticate",option+1) == 0)
          {
            if (*option == '+')
              break;
            i++;
            if (i == (ssize_t) argc)
              ThrowCompareException(OptionError,"MissingArgument",option);
            break;
          }
        ThrowCompareException(OptionError,"UnrecognizedOption",option);
      }
      case 'c':
      {
        if (LocaleCompare("cache",option+1) == 0)
          {
            if (*option == '+')
              break;
            i++;
            if (i == (ssize_t) argc)
              ThrowCompareException(OptionError,"MissingArgument",option);
            if (IsGeometry(argv[i]) == MagickFalse)
              ThrowCompareInvalidArgumentException(option,argv[i]);
            break;
          }
        if (LocaleCompare("channel",option+1) == 0)
          {
            ssize_t
              channel;

            if (*option == '+')
              break;
            i++;
            if (i == (ssize_t) argc)
              ThrowCompareException(OptionError,"MissingArgument",option);
            channel=ParseChannelOption(argv[i]);
            if (channel < 0)
              ThrowCompareException(OptionError,"UnrecognizedChannelType",
                argv[i]);
            (void) SetPixelChannelMask(image,(ChannelType) channel);
            break;
          }
        if (LocaleCompare("colorspace",option+1) == 0)
          {
            ssize_t
              colorspace;

            if (*option == '+')
              break;
            i++;
            if (i == (ssize_t) argc)
              ThrowCompareException(OptionError,"MissingArgument",option);
            colorspace=ParseCommandOption(MagickColorspaceOptions,MagickFalse,
              argv[i]);
            if (colorspace < 0)
              ThrowCompareException(OptionError,"UnrecognizedColorspace",
                argv[i]);
            break;
          }
        if (LocaleCompare("compose",option+1) == 0)
          {
            ssize_t
              compose;

            if (*option == '+')
              break;
            i++;
            if (i == (ssize_t) argc)
              ThrowCompareException(OptionError,"MissingArgument",option);
            compose=ParseCommandOption(MagickComposeOptions,MagickFalse,
              argv[i]);
            if (compose < 0)
              ThrowCompareException(OptionError,"UnrecognizedComposeOperator",
                argv[i]);
            break;
          }
        if (LocaleCompare("compress",option+1) == 0)
          {
            ssize_t
              compress;

            if (*option == '+')
              break;
            i++;
            if (i == (ssize_t) argc)
              ThrowCompareException(OptionError,"MissingArgument",option);
            compress=ParseCommandOption(MagickCompressOptions,MagickFalse,
              argv[i]);
            if (compress < 0)
              ThrowCompareException(OptionError,"UnrecognizedImageCompression",
                argv[i]);
            break;
          }
        if (LocaleCompare("concurrent",option+1) == 0)
          break;
        ThrowCompareException(OptionError,"UnrecognizedOption",option)
      }
      case 'd':
      {
        if (LocaleCompare("debug",option+1) == 0)
          {
            LogEventType
              event_mask;

            if (*option == '+')
              break;
            i++;
            if (i == (ssize_t) argc)
              ThrowCompareException(OptionError,"MissingArgument",option);
            event_mask=SetLogEventMask(argv[i]);
            if (event_mask == UndefinedEvents)
              ThrowCompareException(OptionError,"UnrecognizedEventType",
                argv[i]);
            break;
          }
        if (LocaleCompare("decipher",option+1) == 0)
          {
            if (*option == '+')
              break;
            i++;
            if (i == (ssize_t) argc)
              ThrowCompareException(OptionError,"MissingArgument",option);
            break;
          }
        if (LocaleCompare("define",option+1) == 0)
          {
            i++;
            if (i == (ssize_t) argc)
              ThrowCompareException(OptionError,"MissingArgument",option);
            if (*option == '+')
              {
                const char
                  *define;

                define=GetImageOption(image_info,argv[i]);
                if (define == (const char *) NULL)
                  ThrowCompareException(OptionError,"NoSuchOption",argv[i]);
                break;
              }
            break;
          }
        if (LocaleCompare("density",option+1) == 0)
          {
            if (*option == '+')
              break;
            i++;
            if (i == (ssize_t) argc)
              ThrowCompareException(OptionError,"MissingArgument",option);
            if (IsGeometry(argv[i]) == MagickFalse)
              ThrowCompareInvalidArgumentException(option,argv[i]);
            break;
          }
        if (LocaleCompare("depth",option+1) == 0)
          {
            if (*option == '+')
              break;
            i++;
            if (i == (ssize_t) argc)
              ThrowCompareException(OptionError,"MissingArgument",option);
            if (IsGeometry(argv[i]) == MagickFalse)
              ThrowCompareInvalidArgumentException(option,argv[i]);
            break;
          }
        if (LocaleCompare("dissimilarity-threshold",option+1) == 0)
          {
            if (*option == '+')
              break;
            i++;
            if (i == (ssize_t) argc)
              ThrowCompareException(OptionError,"MissingArgument",option);
            if (IsGeometry(argv[i]) == MagickFalse)
              ThrowCompareInvalidArgumentException(option,argv[i]);
            if (*option == '+')
              dissimilarity_threshold=DefaultDissimilarityThreshold;
            else
              dissimilarity_threshold=StringToDouble(argv[i],(char **) NULL);
            break;
          }
        if (LocaleCompare("duration",option+1) == 0)
          {
            if (*option == '+')
              break;
            i++;
            if (i == (ssize_t) argc)
              ThrowCompareException(OptionError,"MissingArgument",option);
            if (IsGeometry(argv[i]) == MagickFalse)
              ThrowCompareInvalidArgumentException(option,argv[i]);
            break;
          }
        ThrowCompareException(OptionError,"UnrecognizedOption",option)
      }
      case 'e':
      {
        if (LocaleCompare("encipher",option+1) == 0)
          {
            if (*option == '+')
              break;
            i++;
            if (i == (ssize_t) argc)
              ThrowCompareException(OptionError,"MissingArgument",option);
            break;
          }
        if (LocaleCompare("extract",option+1) == 0)
          {
            if (*option == '+')
              break;
            i++;
            if (i == (ssize_t) argc)
              ThrowCompareException(OptionError,"MissingArgument",option);
            if (IsGeometry(argv[i]) == MagickFalse)
              ThrowCompareInvalidArgumentException(option,argv[i]);
            break;
          }
        ThrowCompareException(OptionError,"UnrecognizedOption",option)
      }
      case 'f':
      {
        if (LocaleCompare("format",option+1) == 0)
          {
            if (*option == '+')
              break;
            i++;
            if (i == (ssize_t) argc)
              ThrowCompareException(OptionError,"MissingArgument",option);
            format=argv[i];
            break;
          }
        if (LocaleCompare("fuzz",option+1) == 0)
          {
            if (*option == '+')
              break;
            i++;
            if (i == (ssize_t) argc)
              ThrowCompareException(OptionError,"MissingArgument",option);
            if (IsGeometry(argv[i]) == MagickFalse)
              ThrowCompareInvalidArgumentException(option,argv[i]);
            break;
          }
        ThrowCompareException(OptionError,"UnrecognizedOption",option)
      }
      case 'h':
      {
        if ((LocaleCompare("help",option+1) == 0) ||
            (LocaleCompare("-help",option+1) == 0))
          return(CompareUsage());
        if (LocaleCompare("highlight-color",option+1) == 0)
          {
            if (*option == '+')
              break;
            i++;
            if (i == (ssize_t) argc)
              ThrowCompareException(OptionError,"MissingArgument",option);
            break;
          }
        ThrowCompareException(OptionError,"UnrecognizedOption",option)
      }
      case 'i':
      {
        if (LocaleCompare("identify",option+1) == 0)
          break;
        if (LocaleCompare("interlace",option+1) == 0)
          {
            ssize_t
              interlace;

            if (*option == '+')
              break;
            i++;
            if (i == (ssize_t) argc)
              ThrowCompareException(OptionError,"MissingArgument",option);
            interlace=ParseCommandOption(MagickInterlaceOptions,MagickFalse,
              argv[i]);
            if (interlace < 0)
              ThrowCompareException(OptionError,"UnrecognizedInterlaceType",
                argv[i]);
            break;
          }
        ThrowCompareException(OptionError,"UnrecognizedOption",option)
      }
      case 'l':
      {
        if (LocaleCompare("limit",option+1) == 0)
          {
            char
              *p;

            double
              value;

            ssize_t
              resource;

            if (*option == '+')
              break;
            i++;
            if (i == (ssize_t) argc)
              ThrowCompareException(OptionError,"MissingArgument",option);
            resource=ParseCommandOption(MagickResourceOptions,MagickFalse,
              argv[i]);
            if (resource < 0)
              ThrowCompareException(OptionError,"UnrecognizedResourceType",
                argv[i]);
            i++;
            if (i == (ssize_t) argc)
              ThrowCompareException(OptionError,"MissingArgument",option);
            value=StringToDouble(argv[i],&p);
            (void) value;
            if ((p == argv[i]) && (LocaleCompare("unlimited",argv[i]) != 0))
              ThrowCompareInvalidArgumentException(option,argv[i]);
            break;
          }
        if (LocaleCompare("list",option+1) == 0)
          {
            ssize_t
              list;

            if (*option == '+')
              break;
            i++;
            if (i == (ssize_t) argc)
              ThrowCompareException(OptionError,"MissingArgument",option);
            list=ParseCommandOption(MagickListOptions,MagickFalse,argv[i]);
            if (list < 0)
              ThrowCompareException(OptionError,"UnrecognizedListType",argv[i]);
            status=MogrifyImageInfo(image_info,(int) (i-j+1),(const char **)
              argv+j,exception);
            DestroyCompare();
            return(status == 0 ? MagickTrue : MagickFalse);
          }
        if (LocaleCompare("log",option+1) == 0)
          {
            if (*option == '+')
              break;
            i++;
            if ((i == (ssize_t) argc) || (strchr(argv[i],'%') == (char *) NULL))
              ThrowCompareException(OptionError,"MissingArgument",option);
            break;
          }
        if (LocaleCompare("lowlight-color",option+1) == 0)
          {
            if (*option == '+')
              break;
            i++;
            if (i == (ssize_t) argc)
              ThrowCompareException(OptionError,"MissingArgument",option);
            break;
          }
        ThrowCompareException(OptionError,"UnrecognizedOption",option)
      }
      case 'm':
      {
        if (LocaleCompare("matte",option+1) == 0)
          break;
        if (LocaleCompare("metric",option+1) == 0)
          {
            ssize_t
              type;

            if (*option == '+')
              break;
            i++;
            if (i == (ssize_t) argc)
              ThrowCompareException(OptionError,"MissingArgument",option);
            type=ParseCommandOption(MagickMetricOptions,MagickTrue,argv[i]);
            if (type < 0)
              ThrowCompareException(OptionError,"UnrecognizedMetricType",
                argv[i]);
            metric=(MetricType) type;
            break;
          }
        if (LocaleCompare("monitor",option+1) == 0)
          break;
        ThrowCompareException(OptionError,"UnrecognizedOption",option)
      }
      case 'p':
      {
        if (LocaleCompare("profile",option+1) == 0)
          {
            i++;
            if (i == (ssize_t) argc)
              ThrowCompareException(OptionError,"MissingArgument",option);
            break;
          }
        ThrowCompareException(OptionError,"UnrecognizedOption",option)
      }
      case 'q':
      {
        if (LocaleCompare("quality",option+1) == 0)
          {
            if (*option == '+')
              break;
            i++;
            if (i == (ssize_t) argc)
              ThrowCompareException(OptionError,"MissingArgument",option);
            if (IsGeometry(argv[i]) == MagickFalse)
              ThrowCompareInvalidArgumentException(option,argv[i]);
            break;
          }
        if (LocaleCompare("quantize",option+1) == 0)
          {
            ssize_t
              colorspace;

            if (*option == '+')
              break;
            i++;
            if (i == (ssize_t) argc)
              ThrowCompareException(OptionError,"MissingArgument",option);
            colorspace=ParseCommandOption(MagickColorspaceOptions,
              MagickFalse,argv[i]);
            if (colorspace < 0)
              ThrowCompareException(OptionError,"UnrecognizedColorspace",
                argv[i]);
            break;
          }
        if (LocaleCompare("quiet",option+1) == 0)
          break;
        ThrowCompareException(OptionError,"UnrecognizedOption",option)
      }
      case 'r':
      {
        if (LocaleCompare("regard-warnings",option+1) == 0)
          break;
        if (LocaleNCompare("respect-parentheses",option+1,17) == 0)
          {
            respect_parenthesis=(*option == '-') ? MagickTrue : MagickFalse;
            break;
          }
        ThrowCompareException(OptionError,"UnrecognizedOption",option)
      }
      case 's':
      {
        if (LocaleCompare("sampling-factor",option+1) == 0)
          {
            if (*option == '+')
              break;
            i++;
            if (i == (ssize_t) argc)
              ThrowCompareException(OptionError,"MissingArgument",option);
            if (IsGeometry(argv[i]) == MagickFalse)
              ThrowCompareInvalidArgumentException(option,argv[i]);
            break;
          }
        if (LocaleCompare("seed",option+1) == 0)
          {
            if (*option == '+')
              break;
            i++;
            if (i == (ssize_t) argc)
              ThrowCompareException(OptionError,"MissingArgument",option);
            if (IsGeometry(argv[i]) == MagickFalse)
              ThrowCompareInvalidArgumentException(option,argv[i]);
            break;
          }
        if (LocaleCompare("set",option+1) == 0)
          {
            i++;
            if (i == (ssize_t) argc)
              ThrowCompareException(OptionError,"MissingArgument",option);
            if (*option == '+')
              break;
            i++;
            if (i == (ssize_t) argc)
              ThrowCompareException(OptionError,"MissingArgument",option);
            break;
          }
        if (LocaleCompare("similarity-threshold",option+1) == 0)
          {
            if (*option == '+')
              break;
            i++;
            if (i == (ssize_t) argc)
              ThrowCompareException(OptionError,"MissingArgument",option);
            if (IsGeometry(argv[i]) == MagickFalse)
              ThrowCompareInvalidArgumentException(option,argv[i]);
            if (*option == '+')
              similarity_threshold=DefaultSimilarityThreshold;
            else
              similarity_threshold=StringToDouble(argv[i],(char **) NULL);
            break;
          }
        if (LocaleCompare("size",option+1) == 0)
          {
            if (*option == '+')
              break;
            i++;
            if (i == (ssize_t) argc)
              ThrowCompareException(OptionError,"MissingArgument",option);
            if (IsGeometry(argv[i]) == MagickFalse)
              ThrowCompareInvalidArgumentException(option,argv[i]);
            break;
          }
        if (LocaleCompare("subimage-search",option+1) == 0)
          {
            if (*option == '+')
              {
                subimage_search=MagickFalse;
                break;
              }
            subimage_search=MagickTrue;
            break;
          }
        if (LocaleCompare("synchronize",option+1) == 0)
          break;
        ThrowCompareException(OptionError,"UnrecognizedOption",option)
      }
      case 't':
      {
        if (LocaleCompare("taint",option+1) == 0)
          break;
        if (LocaleCompare("transparent-color",option+1) == 0)
          {
            if (*option == '+')
              break;
            i++;
            if (i == (ssize_t) argc)
              ThrowCompareException(OptionError,"MissingArgument",option);
            break;
          }
        if (LocaleCompare("type",option+1) == 0)
          {
            ssize_t
              type;

            if (*option == '+')
              break;
            i++;
            if (i == (ssize_t) argc)
              ThrowCompareException(OptionError,"MissingArgument",option);
            type=ParseCommandOption(MagickTypeOptions,MagickFalse,argv[i]);
            if (type < 0)
              ThrowCompareException(OptionError,"UnrecognizedImageType",
                argv[i]);
            break;
          }
        ThrowCompareException(OptionError,"UnrecognizedOption",option)
      }
      case 'v':
      {
        if (LocaleCompare("verbose",option+1) == 0)
          break;
        if ((LocaleCompare("version",option+1) == 0) ||
            (LocaleCompare("-version",option+1) == 0))
          {
            ListMagickVersion(stdout);
            break;
          }
        if (LocaleCompare("virtual-pixel",option+1) == 0)
          {
            ssize_t
              method;

            if (*option == '+')
              break;
            i++;
            if (i == (ssize_t) argc)
              ThrowCompareException(OptionError,"MissingArgument",option);
            method=ParseCommandOption(MagickVirtualPixelOptions,MagickFalse,
              argv[i]);
            if (method < 0)
              ThrowCompareException(OptionError,
                "UnrecognizedVirtualPixelMethod",argv[i]);
            break;
          }
        ThrowCompareException(OptionError,"UnrecognizedOption",option)
      }
      case '?':
        break;
      default:
        ThrowCompareException(OptionError,"UnrecognizedOption",option)
    }
    fire=(GetCommandOptionFlags(MagickCommandOptions,MagickFalse,option) &
      FireOptionFlag) == 0 ?  MagickFalse : MagickTrue;
    if (fire != MagickFalse)
      FireImageStack(MagickTrue,MagickTrue,MagickTrue);
  }
  if (k != 0)
    ThrowCompareException(OptionError,"UnbalancedParenthesis",argv[i]);
  if (i-- != (ssize_t) (argc-1))
    ThrowCompareException(OptionError,"MissingAnImageFilename",argv[i]);
  if ((image == (Image *) NULL) || (GetImageListLength(image) < 2))
    ThrowCompareException(OptionError,"MissingAnImageFilename",argv[i]);
  FinalizeImageSettings(image_info,image,MagickTrue);
  if ((image == (Image *) NULL) || (GetImageListLength(image) < 2))
    ThrowCompareException(OptionError,"MissingAnImageFilename",argv[i]);
  image=GetImageFromList(image,0);
  reconstruct_image=GetImageFromList(image,1);
  offset.x=0;
  offset.y=0;
  if (subimage_search != MagickFalse)
    {
      similarity_image=SimilarityImage(image,reconstruct_image,metric,
        similarity_threshold,&offset,&similarity_metric,exception);
      if (similarity_metric > dissimilarity_threshold)
        ThrowCompareException(ImageError,"ImagesTooDissimilar",image->filename);
    }
  if ((reconstruct_image->columns == image->columns) &&
       (reconstruct_image->rows == image->rows))
    difference_image=CompareImages(image,reconstruct_image,metric,&distortion,
      exception);
  else
    if (similarity_image == (Image *) NULL)
      {
        if (metric == PerceptualHashErrorMetric)
          difference_image=CompareImages(image,reconstruct_image,metric,
            &distortion,exception);
        else
          ThrowCompareException(OptionError,"ImageWidthsOrHeightsDiffer",
            image->filename);
      }
    else
      {
        Image
          *composite_image;

        /*
          Determine if reconstructed image is a subimage of the image.
        */
        composite_image=CloneImage(image,0,0,MagickTrue,exception);
        if (composite_image == (Image *) NULL)
          difference_image=CompareImages(image,reconstruct_image,metric,
            &distortion,exception);
        else
          {
            Image
              *distort_image;

            RectangleInfo
              page;

            (void) CompositeImage(composite_image,reconstruct_image,
              CopyCompositeOp,MagickTrue,offset.x,offset.y,exception);
            difference_image=CompareImages(image,composite_image,metric,
              &distortion,exception);
            if (difference_image != (Image *) NULL)
              {
                difference_image->page.x=offset.x;
                difference_image->page.y=offset.y;
              }
            composite_image=DestroyImage(composite_image);
            page.width=reconstruct_image->columns;
            page.height=reconstruct_image->rows;
            page.x=offset.x;
            page.y=offset.y;
            distort_image=CropImage(image,&page,exception);
            if (distort_image != (Image *) NULL)
              {
                Image
                  *sans_image;

                sans_image=CompareImages(distort_image,reconstruct_image,metric,
                  &distortion,exception);
                distort_image=DestroyImage(distort_image);
                if (sans_image != (Image *) NULL)
                  sans_image=DestroyImage(sans_image);
              }
          }
        if (difference_image != (Image *) NULL)
          {
            AppendImageToList(&difference_image,similarity_image);
            similarity_image=(Image *) NULL;
          }
      }
  if (difference_image == (Image *) NULL)
    status=0;
  else
    {
      if (image_info->verbose != MagickFalse)
        (void) SetImageColorMetric(image,reconstruct_image,exception);
      if (*difference_image->magick == '\0')
        (void) CopyMagickString(difference_image->magick,image->magick,
          MagickPathExtent);
      if (image_info->verbose == MagickFalse)
        {
          switch (metric)
          {
            case FuzzErrorMetric:
            case MeanAbsoluteErrorMetric:
            case MeanSquaredErrorMetric:
            case PeakAbsoluteErrorMetric:
            case RootMeanSquaredErrorMetric:
            {
              (void) FormatLocaleFile(stderr,"%g (%g)",QuantumRange*distortion,
                (double) distortion);
              break;
            }
            case AbsoluteErrorMetric:
            case NormalizedCrossCorrelationErrorMetric:
            case PeakSignalToNoiseRatioErrorMetric:
            case PerceptualHashErrorMetric:
            {
              (void) FormatLocaleFile(stderr,"%g",distortion);
              break;
            }
            case MeanErrorPerPixelErrorMetric:
            {
              (void) FormatLocaleFile(stderr,"%g (%g, %g)",distortion,
                image->error.normalized_mean_error,
                image->error.normalized_maximum_error);
              break;
            }
            case UndefinedErrorMetric:
              break;
          }
          if (subimage_search != MagickFalse)
            (void) FormatLocaleFile(stderr," @ %.20g,%.20g",(double)
              difference_image->page.x,(double) difference_image->page.y);
        }
      else
        {
          double
            *channel_distortion;

          channel_distortion=GetImageDistortions(image,reconstruct_image,
            metric,exception);
          (void) FormatLocaleFile(stderr,"Image: %s\n",image->filename);
          if ((reconstruct_image->columns != image->columns) ||
              (reconstruct_image->rows != image->rows))
            (void) FormatLocaleFile(stderr,"Offset: %.20g,%.20g\n",(double)
              difference_image->page.x,(double) difference_image->page.y);
          (void) FormatLocaleFile(stderr,"  Channel distortion: %s\n",
            CommandOptionToMnemonic(MagickMetricOptions,(ssize_t) metric));
          switch (metric)
          {
            case FuzzErrorMetric:
            case MeanAbsoluteErrorMetric:
            case MeanSquaredErrorMetric:
            case PeakAbsoluteErrorMetric:
            case RootMeanSquaredErrorMetric:
            {
              switch (image->colorspace)
              {
                case RGBColorspace:
                default:
                {
                  (void) FormatLocaleFile(stderr,"    red: %g (%g)\n",
                    QuantumRange*channel_distortion[RedPixelChannel],
                    channel_distortion[RedPixelChannel]);
                  (void) FormatLocaleFile(stderr,"    green: %g (%g)\n",
                    QuantumRange*channel_distortion[GreenPixelChannel],
                    channel_distortion[GreenPixelChannel]);
                  (void) FormatLocaleFile(stderr,"    blue: %g (%g)\n",
                    QuantumRange*channel_distortion[BluePixelChannel],
                    channel_distortion[BluePixelChannel]);
                  if (image->alpha_trait != UndefinedPixelTrait)
                    (void) FormatLocaleFile(stderr,"    alpha: %g (%g)\n",
                      QuantumRange*channel_distortion[AlphaPixelChannel],
                      channel_distortion[AlphaPixelChannel]);
                  break;
                }
                case CMYKColorspace:
                {
                  (void) FormatLocaleFile(stderr,"    cyan: %g (%g)\n",
                    QuantumRange*channel_distortion[CyanPixelChannel],
                    channel_distortion[CyanPixelChannel]);
                  (void) FormatLocaleFile(stderr,"    magenta: %g (%g)\n",
                    QuantumRange*channel_distortion[MagentaPixelChannel],
                    channel_distortion[MagentaPixelChannel]);
                  (void) FormatLocaleFile(stderr,"    yellow: %g (%g)\n",
                    QuantumRange*channel_distortion[YellowPixelChannel],
                    channel_distortion[YellowPixelChannel]);
                  (void) FormatLocaleFile(stderr,"    black: %g (%g)\n",
                    QuantumRange*channel_distortion[BlackPixelChannel],
                    channel_distortion[BlackPixelChannel]);
                  if (image->alpha_trait != UndefinedPixelTrait)
                    (void) FormatLocaleFile(stderr,"    alpha: %g (%g)\n",
                      QuantumRange*channel_distortion[AlphaPixelChannel],
                      channel_distortion[AlphaPixelChannel]);
                  break;
                }
                case GRAYColorspace:
                {
                  (void) FormatLocaleFile(stderr,"    gray: %g (%g)\n",
                    QuantumRange*channel_distortion[GrayPixelChannel],
                    channel_distortion[GrayPixelChannel]);
                  if (image->alpha_trait != UndefinedPixelTrait)
                    (void) FormatLocaleFile(stderr,"    alpha: %g (%g)\n",
                      QuantumRange*channel_distortion[AlphaPixelChannel],
                      channel_distortion[AlphaPixelChannel]);
                  break;
                }
              }
              (void) FormatLocaleFile(stderr,"    all: %g (%g)\n",
                QuantumRange*channel_distortion[MaxPixelChannels],
                channel_distortion[MaxPixelChannels]);
              break;
            }
            case AbsoluteErrorMetric:
            case NormalizedCrossCorrelationErrorMetric:
            case PeakSignalToNoiseRatioErrorMetric:
            case PerceptualHashErrorMetric:
            {
              switch (image->colorspace)
              {
                case RGBColorspace:
                default:
                {
                  (void) FormatLocaleFile(stderr,"    red: %g\n",
                    channel_distortion[RedPixelChannel]);
                  (void) FormatLocaleFile(stderr,"    green: %g\n",
                    channel_distortion[GreenPixelChannel]);
                  (void) FormatLocaleFile(stderr,"    blue: %g\n",
                    channel_distortion[BluePixelChannel]);
                  if (image->alpha_trait != UndefinedPixelTrait)
                    (void) FormatLocaleFile(stderr,"    alpha: %g\n",
                      channel_distortion[AlphaPixelChannel]);
                  break;
                }
                case CMYKColorspace:
                {
                  (void) FormatLocaleFile(stderr,"    cyan: %g\n",
                    channel_distortion[CyanPixelChannel]);
                  (void) FormatLocaleFile(stderr,"    magenta: %g\n",
                    channel_distortion[MagentaPixelChannel]);
                  (void) FormatLocaleFile(stderr,"    yellow: %g\n",
                    channel_distortion[YellowPixelChannel]);
                  (void) FormatLocaleFile(stderr,"    black: %g\n",
                    channel_distortion[BlackPixelChannel]);
                  if (image->alpha_trait != UndefinedPixelTrait)
                    (void) FormatLocaleFile(stderr,"    alpha: %g\n",
                      channel_distortion[AlphaPixelChannel]);
                  break;
                }
                case GRAYColorspace:
                {
                  (void) FormatLocaleFile(stderr,"    gray: %g\n",
                    channel_distortion[GrayPixelChannel]);
                  if (image->alpha_trait != UndefinedPixelTrait)
                    (void) FormatLocaleFile(stderr,"    alpha: %g\n",
                      channel_distortion[AlphaPixelChannel]);
                  break;
                }
              }
              (void) FormatLocaleFile(stderr,"    all: %g\n",
                channel_distortion[MaxPixelChannels]);
              break;
            }
            case MeanErrorPerPixelErrorMetric:
            {
              (void) FormatLocaleFile(stderr,"    %g (%g, %g)\n",
                channel_distortion[MaxPixelChannels],
                image->error.normalized_mean_error,
                image->error.normalized_maximum_error);
              break;
            }
            case UndefinedErrorMetric:
              break;
          }
          channel_distortion=(double *) RelinquishMagickMemory(
            channel_distortion);
          if (subimage_search != MagickFalse)
            (void) FormatLocaleFile(stderr,"   Offset: %.20g,%.20g\n",(double)
              difference_image->page.x,(double) difference_image->page.y);
        }
      status&=WriteImages(image_info,difference_image,argv[argc-1],exception);
      if ((metadata != (char **) NULL) && (format != (char *) NULL))
        {
          char
            *text;

          text=InterpretImageProperties(image_info,difference_image,format,
            exception);
          if (text == (char *) NULL)
            ThrowCompareException(ResourceLimitError,"MemoryAllocationFailed",
              GetExceptionMessage(errno));
          (void) ConcatenateString(&(*metadata),text);
          text=DestroyString(text);
        }
      difference_image=DestroyImageList(difference_image);
    }
  DestroyCompare();
  if ((metric == NormalizedCrossCorrelationErrorMetric) ||
      (metric == UndefinedErrorMetric))
    {
      if (fabs(distortion-1.0) > CompareEpsilon)
        (void) SetImageOption(image_info,"compare:dissimilar","true");
    }
  else
    if (fabs(distortion) > CompareEpsilon)
      (void) SetImageOption(image_info,"compare:dissimilar","true");
  return(status != 0 ? MagickTrue : MagickFalse);
}