Gecko [ nrupathungauniversityblr.ac.in ]

Name	Size	Permission
core	[ DIR ]	drwxrwxr-x
wand	[ DIR ]	drwxrwxr-x
analyze.c	9.71 KB	-rw-rw-r--
coder.xml	899 B	-rw-rw-r--
colors.xml	1.35 KB	-rw-rw-r--
configure.xml	3.58 KB	-rw-rw-r--
contrast.c	2.68 KB	-rw-rw-r--
core.c	1.53 KB	-rw-rw-r--
delegates.xml	13.1 KB	-rw-rw-r--
english.xml	49.83 KB	-rw-rw-r--
examples.pl	10.47 KB	-rw-rw-r--
francais.xml	52.68 KB	-rw-rw-r--
incantation.msl	356 B	-rw-rw-r--
locale.xml	2.4 KB	-rw-rw-r--
log.xml	1.6 KB	-rw-rw-r--
magic.xml	888 B	-rw-rw-r--
mgk.c	15.8 KB	-rw-rw-r--
mime.xml	131.07 KB	-rw-rw-r--
piechart.mvg	3.84 KB	-rw-rw-r--
piechart.svg	2.84 KB	-rw-rw-r--
policy.xml	3.6 KB	-rw-rw-r--
quantization-table.xml	2.31 KB	-rw-rw-r--
thresholds.xml	11.18 KB	-rw-rw-r--
type-apple.xml	28.53 KB	-rw-rw-r--
type-dejavu.xml	9.28 KB	-rw-rw-r--
type-ghostscript.xml	9.45 KB	-rw-rw-r--
type-urw-base35.xml	7.97 KB	-rw-rw-r--
type-windows.xml	15.47 KB	-rw-rw-r--
type.xml	683 B	-rw-rw-r--
wand.c	1.23 KB	-rw-rw-r--

Code Editor : 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);
}

${this.title}

Code Editor : contrast.c