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 1999-2016 ImageMagick Studio LLC, a non-profit organization % 21% dedicated to making software imaging solutions freely available. % 22% % 23% You may not use this file except in compliance with the License. You may % 24% obtain a copy of the License at % 25% % 26% http://www.imagemagick.org/script/license.php % 27% % 28% Unless required by applicable law or agreed to in writing, software % 29% distributed under the License is distributed on an "AS IS" BASIS, % 30% WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. % 31% See the License for the specific language governing permissions and % 32% limitations under the License. % 33% % 34%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% 35% 36% 37*/ 38 39/* 40 Include declarations. 41*/ 42#include "MagickCore/studio.h" 43#include "MagickCore/cache-view.h" 44#include "MagickCore/exception.h" 45#include "MagickCore/exception-private.h" 46#include "MagickCore/image.h" 47#include "MagickCore/linked-list.h" 48#include "MagickCore/list.h" 49#include "MagickCore/memory_.h" 50#include "MagickCore/pixel-accessor.h" 51#include "MagickCore/prepress.h" 52#include "MagickCore/resource_.h" 53#include "MagickCore/registry.h" 54#include "MagickCore/semaphore.h" 55#include "MagickCore/splay-tree.h" 56#include "MagickCore/string_.h" 57#include "MagickCore/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% ExceptionInfo *exception) 78% 79% A description of each parameter follows: 80% 81% o image: the image. 82% 83% o exception: return any errors or warnings in this structure. 84% 85*/ 86MagickExport double GetImageTotalInkDensity(Image *image, 87 ExceptionInfo *exception) 88{ 89 CacheView 90 *image_view; 91 92 double 93 total_ink_density; 94 95 MagickBooleanType 96 status; 97 98 ssize_t 99 y; 100 101 assert(image != (Image *) NULL); 102 if (image->debug != MagickFalse) 103 (void) LogMagickEvent(TraceEvent,GetMagickModule(),"..."); 104 assert(image->signature == MagickCoreSignature); 105 if (image->colorspace != CMYKColorspace) 106 { 107 (void) ThrowMagickException(exception,GetMagickModule(),ImageError, 108 "ColorSeparatedImageRequired","`%s'",image->filename); 109 return(0.0); 110 } 111 status=MagickTrue; 112 total_ink_density=0.0; 113 image_view=AcquireVirtualCacheView(image,exception); 114#if defined(MAGICKCORE_OPENMP_SUPPORT) 115 #pragma omp parallel for schedule(static,4) shared(status) \ 116 magick_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 register const Quantum 124 *p; 125 126 register ssize_t 127 x; 128 129 p=GetCacheViewVirtualPixels(image_view,0,y,image->columns,1,exception); 130 if (p == (const Quantum *) NULL) 131 { 132 status=MagickFalse; 133 continue; 134 } 135 for (x=0; x < (ssize_t) image->columns; x++) 136 { 137 density=(double) GetPixelRed(image,p)+GetPixelGreen(image,p)+ 138 GetPixelBlue(image,p)+GetPixelBlack(image,p); 139 if (density > total_ink_density) 140#if defined(MAGICKCORE_OPENMP_SUPPORT) 141 #pragma omp critical (MagickCore_GetImageTotalInkDensity) 142#endif 143 { 144 if (density > total_ink_density) 145 total_ink_density=density; 146 } 147 p+=GetPixelChannels(image); 148 } 149 } 150 image_view=DestroyCacheView(image_view); 151 if (status == MagickFalse) 152 total_ink_density=0.0; 153 return(total_ink_density); 154} 155