MagickCore  7.0.8
Convert, Edit, Or Compose Bitmap Images
channel.c
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1 /*
2 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
3 % %
4 % %
5 % %
6 % CCCC H H AAA N N N N EEEEE L %
7 % C H H A A NN N NN N E L %
8 % C HHHHH AAAAA N N N N N N EEE L %
9 % C H H A A N NN N NN E L %
10 % CCCC H H A A N N N N EEEEE LLLLL %
11 % %
12 % %
13 % MagickCore Image Channel Methods %
14 % %
15 % Software Design %
16 % Cristy %
17 % December 2003 %
18 % %
19 % %
20 % Copyright 1999-2018 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 % https://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 %
37 %
38 */
39 
40 /*
41  Include declarations.
42 */
43 #include "MagickCore/studio.h"
45 #include "MagickCore/channel.h"
48 #include "MagickCore/enhance.h"
49 #include "MagickCore/image.h"
50 #include "MagickCore/list.h"
51 #include "MagickCore/log.h"
52 #include "MagickCore/monitor.h"
54 #include "MagickCore/option.h"
57 #include "MagickCore/resource_.h"
60 #include "MagickCore/token.h"
61 #include "MagickCore/utility.h"
62 #include "MagickCore/version.h"
63 
64 /*
65 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
66 % %
67 % %
68 % %
69 % C h a n n e l F x I m a g e %
70 % %
71 % %
72 % %
73 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
74 %
75 % ChannelFxImage() applies a channel expression to the specified image. The
76 % expression consists of one or more channels, either mnemonic or numeric (e.g.
77 % red, 1), separated by actions as follows:
78 %
79 % <=> exchange two channels (e.g. red<=>blue)
80 % => copy one channel to another channel (e.g. red=>green)
81 % = assign a constant value to a channel (e.g. red=50%)
82 % , write new image channels in the specified order (e.g. red, green)
83 % | add a new output image for the next set of channel operations
84 % ; move to the next input image for the source of channel data
85 %
86 % For example, to create 3 grayscale images from the red, green, and blue
87 % channels of an image, use:
88 %
89 % -channel-fx "red; green; blue"
90 %
91 % A channel without an operation symbol implies separate (i.e, semicolon).
92 %
93 % The format of the ChannelFxImage method is:
94 %
95 % Image *ChannelFxImage(const Image *image,const char *expression,
96 % ExceptionInfo *exception)
97 %
98 % A description of each parameter follows:
99 %
100 % o image: the image.
101 %
102 % o expression: A channel expression.
103 %
104 % o exception: return any errors or warnings in this structure.
105 %
106 */
107 
108 typedef enum
109 {
114 } ChannelFx;
115 
116 static MagickBooleanType ChannelImage(Image *destination_image,
117  const PixelChannel destination_channel,const ChannelFx channel_op,
118  const Image *source_image,const PixelChannel source_channel,
119  const Quantum pixel,ExceptionInfo *exception)
120 {
121  CacheView
122  *source_view,
123  *destination_view;
124 
126  status;
127 
128  size_t
129  height,
130  width;
131 
132  ssize_t
133  y;
134 
135  status=MagickTrue;
136  source_view=AcquireVirtualCacheView(source_image,exception);
137  destination_view=AcquireAuthenticCacheView(destination_image,exception);
138  height=MagickMin(source_image->rows,destination_image->rows);
139  width=MagickMin(source_image->columns,destination_image->columns);
140 #if defined(MAGICKCORE_OPENMP_SUPPORT)
141  #pragma omp parallel for schedule(static) shared(status) \
142  magick_number_threads(source_image,source_image,height,1)
143 #endif
144  for (y=0; y < (ssize_t) height; y++)
145  {
146  PixelTrait
147  destination_traits,
148  source_traits;
149 
150  register const Quantum
151  *magick_restrict p;
152 
153  register Quantum
154  *magick_restrict q;
155 
156  register ssize_t
157  x;
158 
159  if (status == MagickFalse)
160  continue;
161  p=GetCacheViewVirtualPixels(source_view,0,y,source_image->columns,1,
162  exception);
163  q=GetCacheViewAuthenticPixels(destination_view,0,y,
164  destination_image->columns,1,exception);
165  if ((p == (const Quantum *) NULL) || (q == (Quantum *) NULL))
166  {
167  status=MagickFalse;
168  continue;
169  }
170  destination_traits=GetPixelChannelTraits(destination_image,
171  destination_channel);
172  source_traits=GetPixelChannelTraits(source_image,source_channel);
173  if ((destination_traits == UndefinedPixelTrait) ||
174  (source_traits == UndefinedPixelTrait))
175  continue;
176  for (x=0; x < (ssize_t) width; x++)
177  {
178  if (channel_op == AssignChannelOp)
179  SetPixelChannel(destination_image,destination_channel,pixel,q);
180  else
181  SetPixelChannel(destination_image,destination_channel,
182  GetPixelChannel(source_image,source_channel,p),q);
183  p+=GetPixelChannels(source_image);
184  q+=GetPixelChannels(destination_image);
185  }
186  if (SyncCacheViewAuthenticPixels(destination_view,exception) == MagickFalse)
187  status=MagickFalse;
188  }
189  destination_view=DestroyCacheView(destination_view);
190  source_view=DestroyCacheView(source_view);
191  return(status);
192 }
193 
194 MagickExport Image *ChannelFxImage(const Image *image,const char *expression,
195  ExceptionInfo *exception)
196 {
197 #define ChannelFxImageTag "ChannelFx/Image"
198 
199  ChannelFx
200  channel_op;
201 
203  channel_mask;
204 
205  char
206  token[MagickPathExtent];
207 
208  const char
209  *p;
210 
211  const Image
212  *source_image;
213 
214  double
215  pixel;
216 
217  Image
218  *destination_image;
219 
221  status;
222 
224  source_channel,
225  destination_channel;
226 
227  ssize_t
228  channels;
229 
230  assert(image != (Image *) NULL);
231  assert(image->signature == MagickCoreSignature);
232  if (image->debug != MagickFalse)
233  (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",image->filename);
234  assert(exception != (ExceptionInfo *) NULL);
235  assert(exception->signature == MagickCoreSignature);
236  source_image=image;
237  destination_image=CloneImage(source_image,0,0,MagickTrue,exception);
238  if (destination_image == (Image *) NULL)
239  return((Image *) NULL);
240  if (expression == (const char *) NULL)
241  return(destination_image);
242  status=SetImageStorageClass(destination_image,DirectClass,exception);
243  if (status == MagickFalse)
244  {
245  destination_image=GetLastImageInList(destination_image);
246  return((Image *) NULL);
247  }
248  destination_channel=RedPixelChannel;
249  channel_mask=UndefinedChannel;
250  pixel=0.0;
251  p=(char *) expression;
252  GetNextToken(p,&p,MagickPathExtent,token);
253  channel_op=ExtractChannelOp;
254  for (channels=0; *token != '\0'; )
255  {
256  ssize_t
257  i;
258 
259  /*
260  Interpret channel expression.
261  */
262  switch (*token)
263  {
264  case ',':
265  {
266  GetNextToken(p,&p,MagickPathExtent,token);
267  break;
268  }
269  case '|':
270  {
271  if (GetNextImageInList(source_image) != (Image *) NULL)
272  source_image=GetNextImageInList(source_image);
273  else
274  source_image=GetFirstImageInList(source_image);
275  GetNextToken(p,&p,MagickPathExtent,token);
276  break;
277  }
278  case ';':
279  {
280  Image
281  *canvas;
282 
283  (void) SetPixelChannelMask(destination_image,channel_mask);
284  if ((channel_op == ExtractChannelOp) && (channels == 1))
285  {
286  (void) SetPixelMetaChannels(destination_image,0,exception);
287  (void) SetImageColorspace(destination_image,GRAYColorspace,
288  exception);
289  }
290  canvas=CloneImage(source_image,0,0,MagickTrue,exception);
291  if (canvas == (Image *) NULL)
292  {
293  destination_image=DestroyImageList(destination_image);
294  return(destination_image);
295  }
296  AppendImageToList(&destination_image,canvas);
297  destination_image=GetLastImageInList(destination_image);
298  status=SetImageStorageClass(destination_image,DirectClass,exception);
299  if (status == MagickFalse)
300  {
301  destination_image=GetLastImageInList(destination_image);
302  return((Image *) NULL);
303  }
304  GetNextToken(p,&p,MagickPathExtent,token);
305  channels=0;
306  destination_channel=RedPixelChannel;
307  channel_mask=UndefinedChannel;
308  break;
309  }
310  default:
311  break;
312  }
313  i=ParsePixelChannelOption(token);
314  if (i < 0)
315  {
317  "UnrecognizedChannelType","`%s'",token);
318  destination_image=DestroyImageList(destination_image);
319  return(destination_image);
320  }
321  source_channel=(PixelChannel) i;
322  channel_op=ExtractChannelOp;
323  GetNextToken(p,&p,MagickPathExtent,token);
324  if (*token == '<')
325  {
326  channel_op=ExchangeChannelOp;
327  GetNextToken(p,&p,MagickPathExtent,token);
328  }
329  if (*token == '=')
330  {
331  if (channel_op != ExchangeChannelOp)
332  channel_op=AssignChannelOp;
333  GetNextToken(p,&p,MagickPathExtent,token);
334  }
335  if (*token == '>')
336  {
337  if (channel_op != ExchangeChannelOp)
338  channel_op=TransferChannelOp;
339  GetNextToken(p,&p,MagickPathExtent,token);
340  }
341  switch (channel_op)
342  {
343  case AssignChannelOp:
344  case ExchangeChannelOp:
345  case TransferChannelOp:
346  {
347  if (channel_op == AssignChannelOp)
348  pixel=StringToDoubleInterval(token,(double) QuantumRange+1.0);
349  else
350  {
351  i=ParsePixelChannelOption(token);
352  if (i < 0)
353  {
354  (void) ThrowMagickException(exception,GetMagickModule(),
355  OptionError,"UnrecognizedChannelType","`%s'",token);
356  destination_image=DestroyImageList(destination_image);
357  return(destination_image);
358  }
359  }
360  destination_channel=(PixelChannel) i;
361  if (i >= (ssize_t) GetPixelChannels(destination_image))
362  (void) SetPixelMetaChannels(destination_image,(size_t) (
363  destination_channel-GetPixelChannels(destination_image)+1),
364  exception);
365  if (image->colorspace != UndefinedColorspace)
366  switch (destination_channel)
367  {
368  case RedPixelChannel:
369  case GreenPixelChannel:
370  case BluePixelChannel:
371  case BlackPixelChannel:
372  case IndexPixelChannel:
373  break;
374  case AlphaPixelChannel:
375  {
376  destination_image->alpha_trait=BlendPixelTrait;
377  break;
378  }
380  {
381  destination_image->channels|=CompositeMaskChannel;
382  break;
383  }
385  {
386  destination_image->channels|=ReadMaskChannel;
387  break;
388  }
390  {
391  destination_image->channels|=WriteMaskChannel;
392  break;
393  }
394  case MetaPixelChannel:
395  default:
396  {
397  (void) SetPixelMetaChannels(destination_image,(size_t) (
398  destination_channel-GetPixelChannels(destination_image)+1),
399  exception);
400  break;
401  }
402  }
403  channel_mask=(ChannelType) (channel_mask | ParseChannelOption(token));
404  if (((channels >= 1) || (destination_channel >= 1)) &&
405  (IsGrayColorspace(destination_image->colorspace) != MagickFalse))
406  (void) SetImageColorspace(destination_image,sRGBColorspace,exception);
407  GetNextToken(p,&p,MagickPathExtent,token);
408  break;
409  }
410  default:
411  break;
412  }
413  status=ChannelImage(destination_image,destination_channel,channel_op,
414  source_image,source_channel,ClampToQuantum(pixel),exception);
415  if (status == MagickFalse)
416  {
417  destination_image=DestroyImageList(destination_image);
418  break;
419  }
420  channels++;
421  if (channel_op == ExchangeChannelOp)
422  {
423  status=ChannelImage(destination_image,source_channel,channel_op,
424  source_image,destination_channel,ClampToQuantum(pixel),exception);
425  if (status == MagickFalse)
426  {
427  destination_image=DestroyImageList(destination_image);
428  break;
429  }
430  channels++;
431  }
432  switch (channel_op)
433  {
434  case ExtractChannelOp:
435  {
436  channel_mask=(ChannelType) (channel_mask |
437  (1UL << destination_channel));
438  destination_channel=(PixelChannel) (destination_channel+1);
439  break;
440  }
441  default:
442  break;
443  }
444  status=SetImageProgress(source_image,ChannelFxImageTag,p-expression,
445  strlen(expression));
446  if (status == MagickFalse)
447  break;
448  }
449  (void) SetPixelChannelMask(destination_image,channel_mask);
450  if ((channel_op == ExtractChannelOp) && (channels == 1))
451  {
452  (void) SetPixelMetaChannels(destination_image,0,exception);
453  (void) SetImageColorspace(destination_image,GRAYColorspace,exception);
454  }
455  return(GetFirstImageInList(destination_image));
456 }
457 
458 /*
459 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
460 % %
461 % %
462 % %
463 % C o m b i n e I m a g e s %
464 % %
465 % %
466 % %
467 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
468 %
469 % CombineImages() combines one or more images into a single image. The
470 % grayscale value of the pixels of each image in the sequence is assigned in
471 % order to the specified channels of the combined image. The typical
472 % ordering would be image 1 => Red, 2 => Green, 3 => Blue, etc.
473 %
474 % The format of the CombineImages method is:
475 %
476 % Image *CombineImages(const Image *images,const ColorspaceType colorspace,
477 % ExceptionInfo *exception)
478 %
479 % A description of each parameter follows:
480 %
481 % o images: the image sequence.
482 %
483 % o colorspace: the image colorspace.
484 %
485 % o exception: return any errors or warnings in this structure.
486 %
487 */
489  const ColorspaceType colorspace,ExceptionInfo *exception)
490 {
491 #define CombineImageTag "Combine/Image"
492 
493  CacheView
494  *combine_view;
495 
496  Image
497  *combine_image;
498 
500  status;
501 
503  progress;
504 
505  ssize_t
506  y;
507 
508  /*
509  Ensure the image are the same size.
510  */
511  assert(image != (const Image *) NULL);
512  assert(image->signature == MagickCoreSignature);
513  if (image->debug != MagickFalse)
514  (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",image->filename);
515  assert(exception != (ExceptionInfo *) NULL);
516  assert(exception->signature == MagickCoreSignature);
517  combine_image=CloneImage(image,0,0,MagickTrue,exception);
518  if (combine_image == (Image *) NULL)
519  return((Image *) NULL);
520  if (SetImageStorageClass(combine_image,DirectClass,exception) == MagickFalse)
521  {
522  combine_image=DestroyImage(combine_image);
523  return((Image *) NULL);
524  }
525  if (colorspace != UndefinedColorspace)
526  (void) SetImageColorspace(combine_image,colorspace,exception);
527  else
528  if (fabs(image->gamma-1.0) <= MagickEpsilon)
529  (void) SetImageColorspace(combine_image,RGBColorspace,exception);
530  else
531  (void) SetImageColorspace(combine_image,sRGBColorspace,exception);
532  switch (combine_image->colorspace)
533  {
534  case UndefinedColorspace:
535  case sRGBColorspace:
536  {
537  if (GetImageListLength(image) > 3)
538  combine_image->alpha_trait=BlendPixelTrait;
539  break;
540  }
542  case GRAYColorspace:
543  {
544  if (GetImageListLength(image) > 1)
545  combine_image->alpha_trait=BlendPixelTrait;
546  break;
547  }
548  case CMYKColorspace:
549  {
550  if (GetImageListLength(image) > 4)
551  combine_image->alpha_trait=BlendPixelTrait;
552  break;
553  }
554  default:
555  break;
556  }
557  /*
558  Combine images.
559  */
560  status=MagickTrue;
561  progress=0;
562  combine_view=AcquireAuthenticCacheView(combine_image,exception);
563  for (y=0; y < (ssize_t) combine_image->rows; y++)
564  {
565  CacheView
566  *image_view;
567 
568  const Image
569  *next;
570 
571  Quantum
572  *pixels;
573 
574  register const Quantum
575  *magick_restrict p;
576 
577  register Quantum
578  *magick_restrict q;
579 
580  register ssize_t
581  i;
582 
583  if (status == MagickFalse)
584  continue;
585  pixels=GetCacheViewAuthenticPixels(combine_view,0,y,combine_image->columns,
586  1,exception);
587  if (pixels == (Quantum *) NULL)
588  {
589  status=MagickFalse;
590  continue;
591  }
592  next=image;
593  for (i=0; i < (ssize_t) GetPixelChannels(combine_image); i++)
594  {
595  register ssize_t
596  x;
597 
598  PixelChannel channel = GetPixelChannelChannel(combine_image,i);
599  PixelTrait traits = GetPixelChannelTraits(combine_image,channel);
600  if (traits == UndefinedPixelTrait)
601  continue;
602  if (next == (Image *) NULL)
603  continue;
604  image_view=AcquireVirtualCacheView(next,exception);
605  p=GetCacheViewVirtualPixels(image_view,0,y,next->columns,1,exception);
606  if (p == (const Quantum *) NULL)
607  continue;
608  q=pixels;
609  for (x=0; x < (ssize_t) combine_image->columns; x++)
610  {
611  if (x < (ssize_t) next->columns)
612  {
613  q[i]=GetPixelGray(next,p);
614  p+=GetPixelChannels(next);
615  }
616  q+=GetPixelChannels(combine_image);
617  }
618  image_view=DestroyCacheView(image_view);
619  next=GetNextImageInList(next);
620  }
621  if (SyncCacheViewAuthenticPixels(combine_view,exception) == MagickFalse)
622  status=MagickFalse;
623  if (image->progress_monitor != (MagickProgressMonitor) NULL)
624  {
626  proceed;
627 
628  proceed=SetImageProgress(image,CombineImageTag,progress++,
629  combine_image->rows);
630  if (proceed == MagickFalse)
631  status=MagickFalse;
632  }
633  }
634  combine_view=DestroyCacheView(combine_view);
635  if (status == MagickFalse)
636  combine_image=DestroyImage(combine_image);
637  return(combine_image);
638 }
639 
640 /*
641 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
642 % %
643 % %
644 % %
645 % G e t I m a g e A l p h a C h a n n e l %
646 % %
647 % %
648 % %
649 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
650 %
651 % GetImageAlphaChannel() returns MagickFalse if the image alpha channel is
652 % not activated. That is, the image is RGB rather than RGBA or CMYK rather
653 % than CMYKA.
654 %
655 % The format of the GetImageAlphaChannel method is:
656 %
657 % MagickBooleanType GetImageAlphaChannel(const Image *image)
658 %
659 % A description of each parameter follows:
660 %
661 % o image: the image.
662 %
663 */
665 {
666  assert(image != (const Image *) NULL);
667  if (image->debug != MagickFalse)
668  (void) LogMagickEvent(TraceEvent,GetMagickModule(),"...");
669  assert(image->signature == MagickCoreSignature);
671 }
672 
673 /*
674 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
675 % %
676 % %
677 % %
678 % S e p a r a t e I m a g e %
679 % %
680 % %
681 % %
682 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
683 %
684 % SeparateImage() separates a channel from the image and returns it as a
685 % grayscale image.
686 %
687 % The format of the SeparateImage method is:
688 %
689 % Image *SeparateImage(const Image *image,const ChannelType channel,
690 % ExceptionInfo *exception)
691 %
692 % A description of each parameter follows:
693 %
694 % o image: the image.
695 %
696 % o channel: the image channel.
697 %
698 % o exception: return any errors or warnings in this structure.
699 %
700 */
702  const ChannelType channel_type,ExceptionInfo *exception)
703 {
704 #define GetChannelBit(mask,bit) (((size_t) (mask) >> (size_t) (bit)) & 0x01)
705 #define SeparateImageTag "Separate/Image"
706 
707  CacheView
708  *image_view,
709  *separate_view;
710 
711  Image
712  *separate_image;
713 
715  status;
716 
718  progress;
719 
720  ssize_t
721  y;
722 
723  /*
724  Initialize separate image attributes.
725  */
726  assert(image != (Image *) NULL);
727  assert(image->signature == MagickCoreSignature);
728  if (image->debug != MagickFalse)
729  (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",image->filename);
730  assert(exception != (ExceptionInfo *) NULL);
731  assert(exception->signature == MagickCoreSignature);
732  separate_image=CloneImage(image,0,0,MagickTrue,exception);
733  if (separate_image == (Image *) NULL)
734  return((Image *) NULL);
735  if (SetImageStorageClass(separate_image,DirectClass,exception) == MagickFalse)
736  {
737  separate_image=DestroyImage(separate_image);
738  return((Image *) NULL);
739  }
740  separate_image->alpha_trait=UndefinedPixelTrait;
741  (void) SetImageColorspace(separate_image,GRAYColorspace,exception);
742  separate_image->gamma=image->gamma;
743  /*
744  Separate image.
745  */
746  status=MagickTrue;
747  progress=0;
748  image_view=AcquireVirtualCacheView(image,exception);
749  separate_view=AcquireAuthenticCacheView(separate_image,exception);
750 #if defined(MAGICKCORE_OPENMP_SUPPORT)
751  #pragma omp parallel for schedule(static) shared(progress,status) \
752  magick_number_threads(image,image,image->rows,1)
753 #endif
754  for (y=0; y < (ssize_t) image->rows; y++)
755  {
756  register const Quantum
757  *magick_restrict p;
758 
759  register Quantum
760  *magick_restrict q;
761 
762  register ssize_t
763  x;
764 
765  if (status == MagickFalse)
766  continue;
767  p=GetCacheViewVirtualPixels(image_view,0,y,image->columns,1,exception);
768  q=QueueCacheViewAuthenticPixels(separate_view,0,y,separate_image->columns,1,
769  exception);
770  if ((p == (const Quantum *) NULL) || (q == (Quantum *) NULL))
771  {
772  status=MagickFalse;
773  continue;
774  }
775  for (x=0; x < (ssize_t) image->columns; x++)
776  {
777  register ssize_t
778  i;
779 
780  SetPixelChannel(separate_image,GrayPixelChannel,(Quantum) 0,q);
781  for (i=0; i < (ssize_t) GetPixelChannels(image); i++)
782  {
783  PixelChannel channel = GetPixelChannelChannel(image,i);
784  PixelTrait traits = GetPixelChannelTraits(image,channel);
785  if ((traits == UndefinedPixelTrait) ||
786  (GetChannelBit(channel_type,channel) == 0))
787  continue;
788  SetPixelChannel(separate_image,GrayPixelChannel,p[i],q);
789  }
790  p+=GetPixelChannels(image);
791  q+=GetPixelChannels(separate_image);
792  }
793  if (SyncCacheViewAuthenticPixels(separate_view,exception) == MagickFalse)
794  status=MagickFalse;
795  if (image->progress_monitor != (MagickProgressMonitor) NULL)
796  {
798  proceed;
799 
800 #if defined(MAGICKCORE_OPENMP_SUPPORT)
801  #pragma omp critical (MagickCore_SeparateImage)
802 #endif
803  proceed=SetImageProgress(image,SeparateImageTag,progress++,image->rows);
804  if (proceed == MagickFalse)
805  status=MagickFalse;
806  }
807  }
808  separate_view=DestroyCacheView(separate_view);
809  image_view=DestroyCacheView(image_view);
810  (void) SetImageChannelMask(separate_image,DefaultChannels);
811  if (status == MagickFalse)
812  separate_image=DestroyImage(separate_image);
813  return(separate_image);
814 }
815 
816 /*
817 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
818 % %
819 % %
820 % %
821 % S e p a r a t e I m a g e s %
822 % %
823 % %
824 % %
825 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
826 %
827 % SeparateImages() returns a separate grayscale image for each channel
828 % specified.
829 %
830 % The format of the SeparateImages method is:
831 %
832 % Image *SeparateImages(const Image *image,ExceptionInfo *exception)
833 %
834 % A description of each parameter follows:
835 %
836 % o image: the image.
837 %
838 % o exception: return any errors or warnings in this structure.
839 %
840 */
842 {
843  Image
844  *images,
845  *separate_image;
846 
847  register ssize_t
848  i;
849 
850  assert(image != (Image *) NULL);
851  assert(image->signature == MagickCoreSignature);
852  if (image->debug != MagickFalse)
853  (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",image->filename);
854  images=NewImageList();
855  for (i=0; i < (ssize_t) GetPixelChannels(image); i++)
856  {
857  PixelChannel channel = GetPixelChannelChannel(image,i);
858  PixelTrait traits = GetPixelChannelTraits(image,channel);
859  if ((traits == UndefinedPixelTrait) || ((traits & UpdatePixelTrait) == 0))
860  continue;
861  separate_image=SeparateImage(image,(ChannelType) (1UL << channel),
862  exception);
863  if (separate_image != (Image *) NULL)
864  AppendImageToList(&images,separate_image);
865  }
866  if (images == (Image *) NULL)
867  images=SeparateImage(image,UndefinedChannel,exception);
868  return(images);
869 }
870 
871 /*
872 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
873 % %
874 % %
875 % %
876 % S e t I m a g e A l p h a C h a n n e l %
877 % %
878 % %
879 % %
880 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
881 %
882 % SetImageAlphaChannel() activates, deactivates, resets, or sets the alpha
883 % channel.
884 %
885 % The format of the SetImageAlphaChannel method is:
886 %
887 % MagickBooleanType SetImageAlphaChannel(Image *image,
888 % const AlphaChannelOption alpha_type,ExceptionInfo *exception)
889 %
890 % A description of each parameter follows:
891 %
892 % o image: the image.
893 %
894 % o alpha_type: The alpha channel type: ActivateAlphaChannel,
895 % AssociateAlphaChannel, CopyAlphaChannel, DeactivateAlphaChannel,
896 % DisassociateAlphaChannel, ExtractAlphaChannel, OffAlphaChannel,
897 % OnAlphaChannel, OpaqueAlphaChannel, SetAlphaChannel, ShapeAlphaChannel,
898 % and TransparentAlphaChannel.
899 %
900 % o exception: return any errors or warnings in this structure.
901 %
902 */
903 
904 static inline void FlattenPixelInfo(const Image *image,const PixelInfo *p,
905  const double alpha,const Quantum *q,const double beta,
906  Quantum *composite)
907 {
908  double
909  Da,
910  gamma,
911  Sa;
912 
913  register ssize_t
914  i;
915 
916  /*
917  Compose pixel p over pixel q with the given alpha.
918  */
919  Sa=QuantumScale*alpha;
920  Da=QuantumScale*beta,
921  gamma=Sa*(-Da)+Sa+Da;
922  gamma=PerceptibleReciprocal(gamma);
923  for (i=0; i < (ssize_t) GetPixelChannels(image); i++)
924  {
925  PixelChannel channel = GetPixelChannelChannel(image,i);
926  PixelTrait traits = GetPixelChannelTraits(image,channel);
927  if (traits == UndefinedPixelTrait)
928  continue;
929  switch (channel)
930  {
931  case RedPixelChannel:
932  {
933  composite[i]=ClampToQuantum(gamma*MagickOver_((double) q[i],beta,
934  (double) p->red,alpha));
935  break;
936  }
937  case GreenPixelChannel:
938  {
939  composite[i]=ClampToQuantum(gamma*MagickOver_((double) q[i],beta,
940  (double) p->green,alpha));
941  break;
942  }
943  case BluePixelChannel:
944  {
945  composite[i]=ClampToQuantum(gamma*MagickOver_((double) q[i],beta,
946  (double) p->blue,alpha));
947  break;
948  }
949  case BlackPixelChannel:
950  {
951  composite[i]=ClampToQuantum(gamma*MagickOver_((double) q[i],beta,
952  (double) p->black,alpha));
953  break;
954  }
955  case AlphaPixelChannel:
956  {
957  composite[i]=ClampToQuantum(QuantumRange*(Sa*(-Da)+Sa+Da));
958  break;
959  }
960  default:
961  break;
962  }
963  }
964 }
965 
967  const AlphaChannelOption alpha_type,ExceptionInfo *exception)
968 {
969  CacheView
970  *image_view;
971 
973  status;
974 
975  ssize_t
976  y;
977 
978  assert(image != (Image *) NULL);
979  if (image->debug != MagickFalse)
980  (void) LogMagickEvent(TraceEvent,GetMagickModule(),"...");
981  assert(image->signature == MagickCoreSignature);
982  status=MagickTrue;
983  switch (alpha_type)
984  {
986  {
988  break;
989  }
991  {
992  /*
993  Associate alpha.
994  */
995  status=SetImageStorageClass(image,DirectClass,exception);
996  if (status == MagickFalse)
997  break;
998  image_view=AcquireAuthenticCacheView(image,exception);
999 #if defined(MAGICKCORE_OPENMP_SUPPORT)
1000  #pragma omp parallel for schedule(static) shared(status) \
1001  magick_number_threads(image,image,image->rows,1)
1002 #endif
1003  for (y=0; y < (ssize_t) image->rows; y++)
1004  {
1005  register Quantum
1006  *magick_restrict q;
1007 
1008  register ssize_t
1009  x;
1010 
1011  if (status == MagickFalse)
1012  continue;
1013  q=GetCacheViewAuthenticPixels(image_view,0,y,image->columns,1,
1014  exception);
1015  if (q == (Quantum *) NULL)
1016  {
1017  status=MagickFalse;
1018  continue;
1019  }
1020  for (x=0; x < (ssize_t) image->columns; x++)
1021  {
1022  double
1023  gamma;
1024 
1025  register ssize_t
1026  i;
1027 
1028  gamma=QuantumScale*GetPixelAlpha(image,q);
1029  for (i=0; i < (ssize_t) GetPixelChannels(image); i++)
1030  {
1031  PixelChannel channel = GetPixelChannelChannel(image,i);
1032  PixelTrait traits = GetPixelChannelTraits(image,channel);
1033  if (channel == AlphaPixelChannel)
1034  continue;
1035  if ((traits & UpdatePixelTrait) == 0)
1036  continue;
1037  q[i]=ClampToQuantum(gamma*q[i]);
1038  }
1039  q+=GetPixelChannels(image);
1040  }
1041  if (SyncCacheViewAuthenticPixels(image_view,exception) == MagickFalse)
1042  status=MagickFalse;
1043  }
1044  image_view=DestroyCacheView(image_view);
1045  image->alpha_trait=CopyPixelTrait;
1046  return(status);
1047  }
1049  {
1050  /*
1051  Set transparent pixels to background color.
1052  */
1053  if (image->alpha_trait == UndefinedPixelTrait)
1054  break;
1055  status=SetImageStorageClass(image,DirectClass,exception);
1056  if (status == MagickFalse)
1057  break;
1058  image_view=AcquireAuthenticCacheView(image,exception);
1059 #if defined(MAGICKCORE_OPENMP_SUPPORT)
1060  #pragma omp parallel for schedule(static) shared(status) \
1061  magick_number_threads(image,image,image->rows,1)
1062 #endif
1063  for (y=0; y < (ssize_t) image->rows; y++)
1064  {
1065  register Quantum
1066  *magick_restrict q;
1067 
1068  register ssize_t
1069  x;
1070 
1071  if (status == MagickFalse)
1072  continue;
1073  q=GetCacheViewAuthenticPixels(image_view,0,y,image->columns,1,
1074  exception);
1075  if (q == (Quantum *) NULL)
1076  {
1077  status=MagickFalse;
1078  continue;
1079  }
1080  for (x=0; x < (ssize_t) image->columns; x++)
1081  {
1082  if (GetPixelAlpha(image,q) == TransparentAlpha)
1083  {
1084  SetPixelViaPixelInfo(image,&image->background_color,q);
1086  }
1087  q+=GetPixelChannels(image);
1088  }
1089  if (SyncCacheViewAuthenticPixels(image_view,exception) == MagickFalse)
1090  status=MagickFalse;
1091  }
1092  image_view=DestroyCacheView(image_view);
1093  return(status);
1094  }
1095  case CopyAlphaChannel:
1096  {
1098  status=CompositeImage(image,image,IntensityCompositeOp,MagickTrue,0,0,
1099  exception);
1100  break;
1101  }
1103  {
1104  if (image->alpha_trait == UndefinedPixelTrait)
1105  status=SetImageAlpha(image,OpaqueAlpha,exception);
1106  image->alpha_trait=CopyPixelTrait;
1107  break;
1108  }
1110  {
1111  /*
1112  Disassociate alpha.
1113  */
1114  status=SetImageStorageClass(image,DirectClass,exception);
1115  if (status == MagickFalse)
1116  break;
1118  image_view=AcquireAuthenticCacheView(image,exception);
1119 #if defined(MAGICKCORE_OPENMP_SUPPORT)
1120  #pragma omp parallel for schedule(static) shared(status) \
1121  magick_number_threads(image,image,image->rows,1)
1122 #endif
1123  for (y=0; y < (ssize_t) image->rows; y++)
1124  {
1125  register Quantum
1126  *magick_restrict q;
1127 
1128  register ssize_t
1129  x;
1130 
1131  if (status == MagickFalse)
1132  continue;
1133  q=GetCacheViewAuthenticPixels(image_view,0,y,image->columns,1,
1134  exception);
1135  if (q == (Quantum *) NULL)
1136  {
1137  status=MagickFalse;
1138  continue;
1139  }
1140  for (x=0; x < (ssize_t) image->columns; x++)
1141  {
1142  double
1143  gamma,
1144  Sa;
1145 
1146  register ssize_t
1147  i;
1148 
1149  Sa=QuantumScale*GetPixelAlpha(image,q);
1150  gamma=PerceptibleReciprocal(Sa);
1151  for (i=0; i < (ssize_t) GetPixelChannels(image); i++)
1152  {
1153  PixelChannel channel = GetPixelChannelChannel(image,i);
1154  PixelTrait traits = GetPixelChannelTraits(image,channel);
1155  if (channel == AlphaPixelChannel)
1156  continue;
1157  if ((traits & UpdatePixelTrait) == 0)
1158  continue;
1159  q[i]=ClampToQuantum(gamma*q[i]);
1160  }
1161  q+=GetPixelChannels(image);
1162  }
1163  if (SyncCacheViewAuthenticPixels(image_view,exception) == MagickFalse)
1164  status=MagickFalse;
1165  }
1166  image_view=DestroyCacheView(image_view);
1168  return(status);
1169  }
1170  case DiscreteAlphaChannel:
1171  {
1172  if (image->alpha_trait == UndefinedPixelTrait)
1173  status=SetImageAlpha(image,OpaqueAlpha,exception);
1175  break;
1176  }
1177  case ExtractAlphaChannel:
1178  {
1179  status=CompositeImage(image,image,AlphaCompositeOp,MagickTrue,0,0,
1180  exception);
1182  break;
1183  }
1184  case OffAlphaChannel:
1185  {
1187  break;
1188  }
1189  case OnAlphaChannel:
1190  {
1191  if (image->alpha_trait == UndefinedPixelTrait)
1192  status=SetImageAlpha(image,OpaqueAlpha,exception);
1194  break;
1195  }
1196  case OpaqueAlphaChannel:
1197  {
1198  status=SetImageAlpha(image,OpaqueAlpha,exception);
1199  break;
1200  }
1201  case RemoveAlphaChannel:
1202  {
1203  /*
1204  Remove transparency.
1205  */
1206  if (image->alpha_trait == UndefinedPixelTrait)
1207  break;
1208  status=SetImageStorageClass(image,DirectClass,exception);
1209  if (status == MagickFalse)
1210  break;
1211  image_view=AcquireAuthenticCacheView(image,exception);
1212 #if defined(MAGICKCORE_OPENMP_SUPPORT)
1213  #pragma omp parallel for schedule(static) shared(status) \
1214  magick_number_threads(image,image,image->rows,1)
1215 #endif
1216  for (y=0; y < (ssize_t) image->rows; y++)
1217  {
1218  register Quantum
1219  *magick_restrict q;
1220 
1221  register ssize_t
1222  x;
1223 
1224  if (status == MagickFalse)
1225  continue;
1226  q=GetCacheViewAuthenticPixels(image_view,0,y,image->columns,1,
1227  exception);
1228  if (q == (Quantum *) NULL)
1229  {
1230  status=MagickFalse;
1231  continue;
1232  }
1233  for (x=0; x < (ssize_t) image->columns; x++)
1234  {
1235  FlattenPixelInfo(image,&image->background_color,
1236  image->background_color.alpha,q,(double) GetPixelAlpha(image,q),q);
1237  q+=GetPixelChannels(image);
1238  }
1239  if (SyncCacheViewAuthenticPixels(image_view,exception) == MagickFalse)
1240  status=MagickFalse;
1241  }
1242  image_view=DestroyCacheView(image_view);
1244  break;
1245  }
1246  case SetAlphaChannel:
1247  {
1248  if (image->alpha_trait == UndefinedPixelTrait)
1249  status=SetImageAlpha(image,OpaqueAlpha,exception);
1250  break;
1251  }
1252  case ShapeAlphaChannel:
1253  {
1254  /*
1255  Set alpha channel by shape.
1256  */
1257  status=SetImageStorageClass(image,DirectClass,exception);
1258  if (status == MagickFalse)
1259  break;
1261  (void) SetImageMask(image,WritePixelMask,image,exception);
1262  (void) LevelImageColors(image,&image->background_color,
1263  &image->background_color,MagickTrue,exception);
1264  (void) SetImageMask(image,WritePixelMask,(Image *) NULL,exception);
1265  break;
1266  }
1268  {
1269  status=SetImageAlpha(image,TransparentAlpha,exception);
1270  break;
1271  }
1272  case UndefinedAlphaChannel:
1273  break;
1274  }
1275  if (status == MagickFalse)
1276  return(status);
1277  (void) SetPixelChannelMask(image,image->channel_mask);
1278  return(SyncImagePixelCache(image,exception));
1279 }
size_t rows
Definition: image.h:172
#define magick_restrict
Definition: MagickCore.h:41
MagickExport CacheView * DestroyCacheView(CacheView *cache_view)
Definition: cache-view.c:252
static double MagickOver_(const double p, const double alpha, const double q, const double beta)
#define TransparentAlpha
Definition: image.h:26
static MagickBooleanType SetImageProgress(const Image *image, const char *tag, const MagickOffsetType offset, const MagickSizeType extent)
#define GetChannelBit(mask, bit)
MagickProgressMonitor progress_monitor
Definition: image.h:303
static Quantum GetPixelAlpha(const Image *magick_restrict image, const Quantum *magick_restrict pixel)
PixelTrait alpha_trait
Definition: pixel.h:179
AlphaChannelOption
Definition: image.h:28
static Quantum GetPixelGray(const Image *magick_restrict image, const Quantum *magick_restrict pixel)
size_t signature
Definition: exception.h:123
ChannelFx
Definition: channel.c:108
#define CombineImageTag
#define OpaqueAlpha
Definition: image.h:25
static Quantum GetPixelChannel(const Image *magick_restrict image, const PixelChannel channel, const Quantum *magick_restrict pixel)
MagickPrivate MagickBooleanType SyncImagePixelCache(Image *, ExceptionInfo *)
Definition: cache.c:5509
MagickRealType red
Definition: pixel.h:191
MagickExport MagickBooleanType SetImageAlpha(Image *image, const Quantum alpha, ExceptionInfo *exception)
Definition: image.c:2335
static PixelTrait GetPixelChannelTraits(const Image *magick_restrict image, const PixelChannel channel)
MagickExport Image * ChannelFxImage(const Image *image, const char *expression, ExceptionInfo *exception)
Definition: channel.c:194
static void SetPixelViaPixelInfo(const Image *magick_restrict image, const PixelInfo *magick_restrict pixel_info, Quantum *magick_restrict pixel)
static MagickBooleanType IsGrayColorspace(const ColorspaceType colorspace)
MagickExport const Quantum * GetCacheViewVirtualPixels(const CacheView *cache_view, const ssize_t x, const ssize_t y, const size_t columns, const size_t rows, ExceptionInfo *exception)
Definition: cache-view.c:651
MagickRealType alpha
Definition: pixel.h:191
#define MagickEpsilon
Definition: magick-type.h:110
MagickExport MagickBooleanType CompositeImage(Image *image, const Image *composite, const CompositeOperator compose, const MagickBooleanType clip_to_self, const ssize_t x_offset, const ssize_t y_offset, ExceptionInfo *exception)
Definition: composite.c:528
MagickExport Image * CombineImages(const Image *image, const ColorspaceType colorspace, ExceptionInfo *exception)
Definition: channel.c:488
Definition: log.h:52
ssize_t MagickOffsetType
Definition: magick-type.h:127
MagickExport ssize_t ParseChannelOption(const char *channels)
Definition: option.c:2843
Definition: image.h:151
#define MagickCoreSignature
MagickExport Quantum * GetCacheViewAuthenticPixels(CacheView *cache_view, const ssize_t x, const ssize_t y, const size_t columns, const size_t rows, ExceptionInfo *exception)
Definition: cache-view.c:299
MagickExport Image * GetFirstImageInList(const Image *images)
Definition: list.c:555
MagickExport MagickBooleanType SetImageMask(Image *image, const PixelMask type, const Image *mask, ExceptionInfo *exception)
Definition: image.c:3178
MagickExport MagickBooleanType SetImageAlphaChannel(Image *image, const AlphaChannelOption alpha_type, ExceptionInfo *exception)
Definition: channel.c:966
MagickBooleanType
Definition: magick-type.h:156
MagickExport Image * NewImageList(void)
Definition: list.c:932
static double PerceptibleReciprocal(const double x)
static void FlattenPixelInfo(const Image *image, const PixelInfo *p, const double alpha, const Quantum *q, const double beta, Quantum *composite)
Definition: channel.c:904
MagickExport Image * SeparateImage(const Image *image, const ChannelType channel_type, ExceptionInfo *exception)
Definition: channel.c:701
ChannelType channel_mask
Definition: image.h:288
#define MagickPathExtent
PixelTrait alpha_trait
Definition: image.h:280
MagickRealType blue
Definition: pixel.h:191
MagickExport ChannelType SetPixelChannelMask(Image *image, const ChannelType channel_mask)
Definition: pixel.c:6276
MagickExport ChannelType SetImageChannelMask(Image *image, const ChannelType channel_mask)
Definition: image.c:2497
MagickExport Quantum * QueueCacheViewAuthenticPixels(CacheView *cache_view, const ssize_t x, const ssize_t y, const size_t columns, const size_t rows, ExceptionInfo *exception)
Definition: cache-view.c:977
MagickExport MagickBooleanType ThrowMagickException(ExceptionInfo *exception, const char *module, const char *function, const size_t line, const ExceptionType severity, const char *tag, const char *format,...)
Definition: exception.c:1064
MagickExport MagickBooleanType LogMagickEvent(const LogEventType type, const char *module, const char *function, const size_t line, const char *format,...)
Definition: log.c:1398
size_t signature
Definition: image.h:354
MagickExport MagickBooleanType LevelImageColors(Image *image, const PixelInfo *black_color, const PixelInfo *white_color, const MagickBooleanType invert, ExceptionInfo *exception)
Definition: enhance.c:2652
#define QuantumScale
Definition: magick-type.h:113
size_t columns
Definition: image.h:172
MagickBooleanType(* MagickProgressMonitor)(const char *, const MagickOffsetType, const MagickSizeType, void *)
Definition: monitor.h:26
MagickExport Image * GetLastImageInList(const Image *images)
Definition: list.c:731
ChannelType
Definition: pixel.h:33
MagickExport MagickBooleanType SetImageStorageClass(Image *image, const ClassType storage_class, ExceptionInfo *exception)
Definition: image.c:2613
MagickExport Image * DestroyImageList(Image *images)
Definition: list.c:456
PixelChannel
Definition: pixel.h:67
static size_t GetPixelChannels(const Image *magick_restrict image)
char filename[MagickPathExtent]
Definition: image.h:319
#define GetMagickModule()
Definition: log.h:28
static Quantum ClampToQuantum(const MagickRealType value)
Definition: quantum.h:84
static PixelChannel GetPixelChannelChannel(const Image *magick_restrict image, const ssize_t offset)
MagickExport CacheView * AcquireVirtualCacheView(const Image *image, ExceptionInfo *exception)
Definition: cache-view.c:149
MagickExport void GetNextToken(const char *start, const char **end, const size_t extent, char *token)
Definition: token.c:172
static double StringToDoubleInterval(const char *string, const double interval)
unsigned short Quantum
Definition: magick-type.h:82
MagickExport MagickBooleanType SetImageColorspace(Image *image, const ColorspaceType colorspace, ExceptionInfo *exception)
Definition: colorspace.c:1134
MagickExport MagickBooleanType GetImageAlphaChannel(const Image *image)
Definition: channel.c:664
ChannelType channels
Definition: image.h:366
MagickExport Image * GetNextImageInList(const Image *images)
Definition: list.c:765
MagickRealType black
Definition: pixel.h:191
#define SeparateImageTag
static void SetPixelChannel(const Image *magick_restrict image, const PixelChannel channel, const Quantum quantum, Quantum *magick_restrict pixel)
MagickExport void AppendImageToList(Image **images, const Image *append)
Definition: list.c:78
#define MagickMin(x, y)
Definition: image-private.h:27
ColorspaceType
Definition: colorspace.h:25
#define ChannelFxImageTag
MagickRealType green
Definition: pixel.h:191
MagickExport ssize_t ParsePixelChannelOption(const char *channels)
Definition: option.c:3069
#define MagickExport
MagickExport MagickBooleanType SyncCacheViewAuthenticPixels(CacheView *magick_restrict cache_view, ExceptionInfo *exception)
Definition: cache-view.c:1100
MagickExport MagickBooleanType SetPixelMetaChannels(Image *image, const size_t number_meta_channels, ExceptionInfo *exception)
Definition: pixel.c:6360
MagickExport CacheView * AcquireAuthenticCacheView(const Image *image, ExceptionInfo *exception)
Definition: cache-view.c:112
PixelTrait
Definition: pixel.h:135
PixelInfo background_color
Definition: image.h:179
MagickExport size_t GetImageListLength(const Image *images)
Definition: list.c:690
static MagickBooleanType ChannelImage(Image *destination_image, const PixelChannel destination_channel, const ChannelFx channel_op, const Image *source_image, const PixelChannel source_channel, const Quantum pixel, ExceptionInfo *exception)
Definition: channel.c:116
MagickExport Image * SeparateImages(const Image *image, ExceptionInfo *exception)
Definition: channel.c:841
MagickExport Image * DestroyImage(Image *image)
Definition: image.c:1177
MagickExport Image * CloneImage(const Image *image, const size_t columns, const size_t rows, const MagickBooleanType detach, ExceptionInfo *exception)
Definition: image.c:794
double gamma
Definition: image.h:186
ColorspaceType colorspace
Definition: image.h:157
#define QuantumRange
Definition: magick-type.h:83
MagickBooleanType debug
Definition: image.h:334