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prepress.c
/*
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% %
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% %
% PPPP RRRR EEEEE PPPP RRRR EEEEE SSSSS SSSSS %
% P P R R E P P R R E SS SS %
% PPPP RRRR EEE PPPP RRRR EEE SSS SSS %
% P R R E P R R E SS SS %
% P R R EEEEE P R R EEEEE SSSSS SSSSS %
% %
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% MagickCore Prepress Methods %
% %
% Software Design %
% Cristy %
% October 2001 %
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% Copyright @ 1999 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 %
% %
% https://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. %
% %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
%
*/
␌
/*
Include declarations.
*/
#include "MagickCore/studio.h"
#include "MagickCore/cache-view.h"
#include "MagickCore/exception.h"
#include "MagickCore/exception-private.h"
#include "MagickCore/image.h"
#include "MagickCore/linked-list.h"
#include "MagickCore/list.h"
#include "MagickCore/memory_.h"
#include "MagickCore/pixel-accessor.h"
#include "MagickCore/prepress.h"
#include "MagickCore/resource_.h"
#include "MagickCore/registry.h"
#include "MagickCore/semaphore.h"
#include "MagickCore/splay-tree.h"
#include "MagickCore/string_.h"
#include "MagickCore/thread-private.h"
␌
/*
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% %
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% G e t I m a g e T o t a l I n k D e n s i t y %
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%
% GetImageTotalInkDensity() returns the total ink density for a CMYK image.
% Total Ink Density (TID) is determined by adding the CMYK values in the
% darkest shadow area in an image.
%
% The format of the GetImageTotalInkDensity method is:
%
% double GetImageTotalInkDensity(const Image *image,
% ExceptionInfo *exception)
%
% A description of each parameter follows:
%
% o image: the image.
%
% o exception: return any errors or warnings in this structure.
%
*/
MagickExport double GetImageTotalInkDensity(Image *image,
ExceptionInfo *exception)
{
CacheView
*image_view;
double
total_ink_density;
MagickBooleanType
status;
ssize_t
y;
assert(image != (Image *) NULL);
assert(image->signature == MagickCoreSignature);
if (IsEventLogging() != MagickFalse)
(void) LogMagickEvent(TraceEvent,GetMagickModule(),"...");
if (image->colorspace != CMYKColorspace)
{
(void) ThrowMagickException(exception,GetMagickModule(),ImageError,
"ColorSeparatedImageRequired","`%s'",image->filename);
return(0.0);
}
status=MagickTrue;
total_ink_density=0.0;
image_view=AcquireVirtualCacheView(image,exception);
#if defined(MAGICKCORE_OPENMP_SUPPORT)
#pragma omp parallel for schedule(static) shared(status) \
magick_number_threads(image,image,image->rows,1)
#endif
for (y=0; y < (ssize_t) image->rows; y++)
{
double
density;
const Quantum
*p;
ssize_t
x;
p=GetCacheViewVirtualPixels(image_view,0,y,image->columns,1,exception);
if (p == (const Quantum *) NULL)
{
status=MagickFalse;
continue;
}
for (x=0; x < (ssize_t) image->columns; x++)
{
density=(double) GetPixelRed(image,p)+(double) GetPixelGreen(image,p)+
(double) GetPixelBlue(image,p)+(double) GetPixelBlack(image,p);
if (density > total_ink_density)
#if defined(MAGICKCORE_OPENMP_SUPPORT)
#pragma omp critical (MagickCore_GetImageTotalInkDensity)
#endif
{
if (density > total_ink_density)
total_ink_density=density;
}
p+=(ptrdiff_t) GetPixelChannels(image);
}
}
image_view=DestroyCacheView(image_view);
if (status == MagickFalse)
total_ink_density=0.0;
return(total_ink_density);
}
_CacheView
Definition cache-view.c:66
_ExceptionInfo
Definition exception.h:102
_Image
Definition image.h:132