Graybyt3 Was Here

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contrast.c

#include <stdio.h>
#include <stdlib.h>
#include <math.h>
#include <wand/MagickWand.h>

int main(int argc,char **argv)
{
#define QuantumScale  ((MagickRealType) 1.0/(MagickRealType) QuantumRange)
#define SigmoidalContrast(x) \
  (QuantumRange*(1.0/(1+exp(10.0*(0.5-QuantumScale*x)))-0.0066928509)*1.0092503)
#define ThrowWandException(wand) \
{ \
  char \
    *description; \
 \
  ExceptionType \
    severity; \
 \
  description=MagickGetException(wand,&severity); \
  (void) fprintf(stderr,"%s %s %lu %s\n",GetMagickModule(),description); \
  description=(char *) MagickRelinquishMemory(description); \
  exit(-1); \
}

MagickBooleanType
    status;

MagickPixelPacket
    pixel;

MagickWand
    *contrast_wand,
    *image_wand;

PixelIterator
    *contrast_iterator,
    *iterator;

PixelWand
    **contrast_pixels,
    **pixels;

size_t
    width;

ssize_t
    y;

if (argc != 3)
    {
      (void) fprintf(stdout,"Usage: %s image sigmoidal-image\n",argv[0]);
      exit(0);
    }
  /*
    Read an image.
  */
  MagickWandGenesis();
  image_wand=NewMagickWand();
  status=MagickReadImage(image_wand,argv[1]);
  if (status == MagickFalse)
    ThrowWandException(image_wand);
  contrast_wand=CloneMagickWand(image_wand);
  /*
    Sigmoidal non-linearity contrast control.
  */
  iterator=NewPixelIterator(image_wand);
  contrast_iterator=NewPixelIterator(contrast_wand);
  if ((iterator == (PixelIterator *) NULL) ||
      (contrast_iterator == (PixelIterator *) NULL))
    ThrowWandException(image_wand);
  for (y=0; y < (ssize_t) MagickGetImageHeight(image_wand); y++)
  {
    pixels=PixelGetNextIteratorRow(iterator,&width);
    contrast_pixels=PixelGetNextIteratorRow(contrast_iterator,&width);
    if ((pixels == (PixelWand **) NULL) ||
        (contrast_pixels == (PixelWand **) NULL))
      break;
    for (x=0; x < (ssize_t) width; x++)
    {
      PixelGetMagickColor(pixels[x],&pixel);
      pixel.red=SigmoidalContrast(pixel.red);
      pixel.green=SigmoidalContrast(pixel.green);
      pixel.blue=SigmoidalContrast(pixel.blue);
      pixel.index=SigmoidalContrast(pixel.index);
      PixelSetMagickColor(contrast_pixels[x],&pixel);
    }
    (void) PixelSyncIterator(contrast_iterator);
  }
  if (y < (ssize_t) MagickGetImageHeight(image_wand))
    ThrowWandException(image_wand);
  contrast_iterator=DestroyPixelIterator(contrast_iterator);
  iterator=DestroyPixelIterator(iterator);
  image_wand=DestroyMagickWand(image_wand);
  /*
    Write the image then destroy it.
  */
  status=MagickWriteImages(contrast_wand,argv[2],MagickTrue);
  if (status == MagickFalse)
    ThrowWandException(image_wand);
  contrast_wand=DestroyMagickWand(contrast_wand);
  MagickWandTerminus();
  return(0);
}

System Information
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File : BlackDragon /wanderfuls/about.php

Name	Type	Size	Owner/Group	Permission	Last Modified	Actions
.	dir	-	root/root	0755	2019-07-04 06:45:39
..	dir	-	root/root	0755	2019-07-04 06:45:39
analyze.c	file	9.72 KB	root/root	0644	2016-10-13 05:06:50
coder.xml	file	842 B	root/root	0644	2016-10-13 05:06:50
colors.xml	file	1.35 KB	root/root	0644	2016-10-13 05:06:50
configure.xml	file	2.82 KB	root/root	0644	2016-10-13 05:06:50
contrast.c	file	2.68 KB	root/root	0644	2016-10-13 05:06:50
core.c	file	1.53 KB	root/root	0644	2016-10-13 05:06:50
delegates.xml	file	10.64 KB	root/root	0644	2016-10-13 05:06:50
english.xml	file	46.37 KB	root/root	0644	2016-10-13 05:06:50
examples.pl	file	10.47 KB	root/root	0644	2016-10-13 05:06:50
francais.xml	file	48.92 KB	root/root	0644	2016-10-13 05:06:50
incantation.msl	file	356 B	root/root	0644	2016-10-13 05:06:50
locale.xml	file	2.35 KB	root/root	0644	2016-10-13 05:06:50
log.xml	file	956 B	root/root	0644	2016-10-13 05:06:50
magic.xml	file	888 B	root/root	0644	2016-10-13 05:06:50
mime.xml	file	130.89 KB	root/root	0644	2016-10-13 05:06:50
piechart.mvg	file	3.84 KB	root/root	0644	2016-10-13 05:06:50
piechart.svg	file	2.84 KB	root/root	0644	2016-10-13 05:06:50
policy.xml	file	2.22 KB	root/root	0644	2016-10-13 05:06:50
thresholds.xml	file	11.04 KB	root/root	0644	2016-10-13 05:06:50
type-ghostscript.xml	file	9.5 KB	root/root	0644	2016-10-13 05:06:50
type-windows.xml	file	13.33 KB	root/root	0644	2016-10-13 05:06:50
type.xml	file	706 B	root/root	0644	2016-10-13 05:06:50
wand.c	file	1.23 KB	root/root	0644	2016-10-13 05:06:50