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107 lines
2.6 KiB
107 lines
2.6 KiB
4 months ago
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#include <stdio.h>
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#include <stdlib.h>
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#include <math.h>
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#include <wand/MagickWand.h>
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static MagickBooleanType SigmoidalContrast(WandView *contrast_view,
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const ssize_t y,const int id,void *context)
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{
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#define QuantumScale ((MagickRealType) 1.0/(MagickRealType) QuantumRange)
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#define SigmoidalContrast(x) \
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(QuantumRange*(1.0/(1+exp(10.0*(0.5-QuantumScale*x)))-0.0066928509)*1.0092503)
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RectangleInfo
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extent;
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MagickPixelPacket
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pixel;
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PixelWand
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**pixels;
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register ssize_t
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x;
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extent=GetWandViewExtent(contrast_view);
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pixels=GetWandViewPixels(contrast_view);
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for (x=0; x < (ssize_t) (extent.width-extent.x); x++)
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{
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PixelGetMagickColor(pixels[x],&pixel);
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pixel.red=SigmoidalContrast(pixel.red);
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pixel.green=SigmoidalContrast(pixel.green);
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pixel.blue=SigmoidalContrast(pixel.blue);
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pixel.index=SigmoidalContrast(pixel.index);
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PixelSetMagickColor(pixels[x],&pixel);
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}
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return(MagickTrue);
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}
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int main(int argc,char **argv)
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{
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#define ThrowViewException(view) \
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{ \
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description=GetWandViewException(view,&severity); \
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(void) fprintf(stderr,"%s %s %lu %s\n",GetMagickModule(),description); \
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description=(char *) MagickRelinquishMemory(description); \
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exit(-1); \
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}
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#define ThrowWandException(wand) \
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{ \
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description=MagickGetException(wand,&severity); \
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(void) fprintf(stderr,"%s %s %lu %s\n",GetMagickModule(),description); \
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description=(char *) MagickRelinquishMemory(description); \
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exit(-1); \
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}
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char
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*description;
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ExceptionType
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severity;
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MagickBooleanType
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status;
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MagickPixelPacket
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pixel;
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MagickWand
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*contrast_wand;
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WandView
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*contrast_view;
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if (argc != 3)
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{
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(void) fprintf(stdout,"Usage: %s image sigmoidal-image\n",argv[0]);
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exit(0);
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}
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/*
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Read an image.
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*/
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MagickWandGenesis();
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contrast_wand=NewMagickWand();
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status=MagickReadImage(contrast_wand,argv[1]);
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if (status == MagickFalse)
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ThrowWandException(contrast_wand);
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/*
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Sigmoidal non-linearity contrast control.
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*/
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contrast_view=NewWandView(contrast_wand);
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if (contrast_view == (WandView *) NULL)
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ThrowWandException(contrast_wand);
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status=UpdateWandViewIterator(contrast_view,SigmoidalContrast,(void *) NULL);
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if (status == MagickFalse)
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ThrowWandException(contrast_wand);
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contrast_view=DestroyWandView(contrast_view);
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/*
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Write the image then destroy it.
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*/
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status=MagickWriteImages(contrast_wand,argv[2],MagickTrue);
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if (status == MagickFalse)
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ThrowWandException(contrast_wand);
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contrast_wand=DestroyMagickWand(contrast_wand);
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MagickWandTerminus();
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return(0);
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}
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