MagickCore  6.9.12-67
Convert, Edit, Or Compose Bitmap Images
 All Data Structures
prepress.c
1 /*
2 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
3 % %
4 % %
5 % %
6 % PPPP RRRR EEEEE PPPP RRRR EEEEE SSSSS SSSSS %
7 % P P R R E P P R R E SS SS %
8 % PPPP RRRR EEE PPPP RRRR EEE SSS SSS %
9 % P R R E P R R E SS SS %
10 % P R R EEEEE P R R EEEEE SSSSS SSSSS %
11 % %
12 % %
13 % MagickCore Prepress Methods %
14 % %
15 % Software Design %
16 % Cristy %
17 % October 2001 %
18 % %
19 % %
20 % Copyright 1999-2021 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  Include declarations.
41 */
42 #include "magick/studio.h"
43 #include "magick/cache-view.h"
44 #include "magick/exception.h"
45 #include "magick/exception-private.h"
46 #include "magick/hashmap.h"
47 #include "magick/image.h"
48 #include "magick/list.h"
49 #include "magick/memory_.h"
50 #include "magick/pixel-accessor.h"
51 #include "magick/prepress.h"
52 #include "magick/registry.h"
53 #include "magick/resource_.h"
54 #include "magick/semaphore.h"
55 #include "magick/splay-tree.h"
56 #include "magick/string_.h"
57 #include "magick/thread-private.h"
58 
59 /*
60 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
61 % %
62 % %
63 % %
64 % G e t I m a g e T o t a l I n k D e n s i t y %
65 % %
66 % %
67 % %
68 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
69 %
70 % GetImageTotalInkDensity() returns the total ink density for a CMYK image.
71 % Total Ink Density (TID) is determined by adding the CMYK values in the
72 % darkest shadow area in an image.
73 %
74 % The format of the GetImageTotalInkDensity method is:
75 %
76 % double GetImageTotalInkDensity(const Image *image)
77 %
78 % A description of each parameter follows:
79 %
80 % o image: the image.
81 %
82 */
83 MagickExport double GetImageTotalInkDensity(Image *image)
84 {
85  CacheView
86  *image_view;
87 
88  double
89  total_ink_density;
90 
92  *exception;
93 
94  MagickBooleanType
95  status;
96 
97  ssize_t
98  y;
99 
100  assert(image != (Image *) NULL);
101  assert(image->signature == MagickCoreSignature);
102  if (IsEventLogging() != MagickFalse)
103  (void) LogMagickEvent(TraceEvent,GetMagickModule(),"...");
104  if (image->colorspace != CMYKColorspace)
105  {
106  (void) ThrowMagickException(&image->exception,GetMagickModule(),
107  ImageError,"ColorSeparatedImageRequired","`%s'",image->filename);
108  return(0.0);
109  }
110  status=MagickTrue;
111  total_ink_density=0.0;
112  exception=(&image->exception);
113  image_view=AcquireVirtualCacheView(image,exception);
114 #if defined(MAGICKCORE_OPENMP_SUPPORT)
115  #pragma omp parallel for schedule(static) shared(status) \
116  magick_number_threads(image,image,image->rows,1)
117 #endif
118  for (y=0; y < (ssize_t) image->rows; y++)
119  {
120  double
121  density;
122 
123  const IndexPacket
124  *indexes;
125 
126  const PixelPacket
127  *p;
128 
129  ssize_t
130  x;
131 
132  p=GetCacheViewVirtualPixels(image_view,0,y,image->columns,1,exception);
133  if (p == (const PixelPacket *) NULL)
134  {
135  status=MagickFalse;
136  continue;
137  }
138  indexes=GetCacheViewVirtualIndexQueue(image_view);
139  for (x=0; x < (ssize_t) image->columns; x++)
140  {
141  density=(double) GetPixelRed(p)+GetPixelGreen(p)+
142  GetPixelBlue(p)+GetPixelIndex(indexes+x);
143  if (density > total_ink_density)
144 #if defined(MAGICKCORE_OPENMP_SUPPORT)
145  #pragma omp critical (MagickCore_GetImageTotalInkDensity)
146 #endif
147  {
148  if (density > total_ink_density)
149  total_ink_density=density;
150  }
151  p++;
152  }
153  }
154  image_view=DestroyCacheView(image_view);
155  if (status == MagickFalse)
156  total_ink_density=0.0;
157  return(total_ink_density);
158 }
Definition: image.h:152