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/*
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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% %
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% %
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% %
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% PPPP RRRR EEEEE PPPP RRRR EEEEE SSSSS SSSSS %
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% P P R R E P P R R E SS SS %
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% PPPP RRRR EEE PPPP RRRR EEE SSS SSS %
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% P R R E P R R E SS SS %
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% P R R EEEEE P R R EEEEE SSSSS SSSSS %
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% %
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% %
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% MagickCore Prepress Methods %
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% %
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% Software Design %
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% Cristy %
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% October 2001 %
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% %
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% %
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% Copyright 1999-2021 ImageMagick Studio LLC, a non-profit organization %
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% dedicated to making software imaging solutions freely available. %
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% %
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% You may not use this file except in compliance with the License. You may %
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% obtain a copy of the License at %
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% %
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% https://imagemagick.org/script/license.php %
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% %
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% Unless required by applicable law or agreed to in writing, software %
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% distributed under the License is distributed on an "AS IS" BASIS, %
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% WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. %
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% See the License for the specific language governing permissions and %
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% limitations under the License. %
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% %
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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%
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%
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*/
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/*
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Include declarations.
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*/
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#include "MagickCore/studio.h"
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#include "MagickCore/cache-view.h"
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#include "MagickCore/exception.h"
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#include "MagickCore/exception-private.h"
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#include "MagickCore/image.h"
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#include "MagickCore/linked-list.h"
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#include "MagickCore/list.h"
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#include "MagickCore/memory_.h"
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#include "MagickCore/pixel-accessor.h"
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#include "MagickCore/prepress.h"
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#include "MagickCore/resource_.h"
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#include "MagickCore/registry.h"
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#include "MagickCore/semaphore.h"
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#include "MagickCore/splay-tree.h"
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#include "MagickCore/string_.h"
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#include "MagickCore/thread-private.h"
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/*
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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% %
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% %
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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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% %
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% %
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% %
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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%
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% GetImageTotalInkDensity() returns the total ink density for a CMYK image.
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% Total Ink Density (TID) is determined by adding the CMYK values in the
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% darkest shadow area in an image.
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%
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% The format of the GetImageTotalInkDensity method is:
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%
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% double GetImageTotalInkDensity(const Image *image,
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% ExceptionInfo *exception)
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%
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% A description of each parameter follows:
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%
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% o image: the image.
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%
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% o exception: return any errors or warnings in this structure.
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%
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*/
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MagickExport double GetImageTotalInkDensity(Image *image,
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ExceptionInfo *exception)
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{
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CacheView
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*image_view;
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double
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total_ink_density;
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MagickBooleanType
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status;
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ssize_t
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y;
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assert(image != (Image *) NULL);
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if (image->debug != MagickFalse)
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(void) LogMagickEvent(TraceEvent,GetMagickModule(),"...");
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assert(image->signature == MagickCoreSignature);
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if (image->colorspace != CMYKColorspace)
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{
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(void) ThrowMagickException(exception,GetMagickModule(),ImageError,
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"ColorSeparatedImageRequired","`%s'",image->filename);
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return(0.0);
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}
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status=MagickTrue;
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total_ink_density=0.0;
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image_view=AcquireVirtualCacheView(image,exception);
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#if defined(MAGICKCORE_OPENMP_SUPPORT)
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#pragma omp parallel for schedule(static) shared(status) \
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magick_number_threads(image,image,image->rows,1)
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#endif
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for (y=0; y < (ssize_t) image->rows; y++)
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{
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double
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density;
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const Quantum
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*p;
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ssize_t
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x;
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p=GetCacheViewVirtualPixels(image_view,0,y,image->columns,1,exception);
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if (p == (const Quantum *) NULL)
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{
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status=MagickFalse;
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continue;
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}
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for (x=0; x < (ssize_t) image->columns; x++)
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{
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density=(double) GetPixelRed(image,p)+GetPixelGreen(image,p)+
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GetPixelBlue(image,p)+GetPixelBlack(image,p);
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if (density > total_ink_density)
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#if defined(MAGICKCORE_OPENMP_SUPPORT)
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#pragma omp critical (MagickCore_GetImageTotalInkDensity)
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#endif
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{
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if (density > total_ink_density)
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total_ink_density=density;
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}
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p+=GetPixelChannels(image);
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}
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}
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image_view=DestroyCacheView(image_view);
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if (status == MagickFalse)
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total_ink_density=0.0;
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return(total_ink_density);
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}
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