/*

 * cmyk.h

 *

 * Copyright (C) 2017-2018, 2022, D. R. Commander.

 * For conditions of distribution and use, see the accompanying README.ijg

 * file.

 *

 * This file contains convenience functions for performing quick & dirty

 * CMYK<->RGB conversion.  This algorithm is suitable for testing purposes

 * only.  Properly converting between CMYK and RGB requires a color management

 * system.

 */

#ifndef CMYK_H

#define CMYK_H

#include <jinclude.h>

#define JPEG_INTERNALS

#include <jpeglib.h>

#include "jsamplecomp.h"

/* Fully reversible */

INLINE

LOCAL(void)

rgb_to_cmyk(_JSAMPLE r, _JSAMPLE g, _JSAMPLE b,

            _JSAMPLE *c, _JSAMPLE *m, _JSAMPLE *y, _JSAMPLE *k)

{

  double ctmp = 1.0 - ((double)r / (double)_MAXJSAMPLE);

  double mtmp = 1.0 - ((double)g / (double)_MAXJSAMPLE);

  double ytmp = 1.0 - ((double)b / (double)_MAXJSAMPLE);

  double ktmp = MIN(MIN(ctmp, mtmp), ytmp);

  if (ktmp == 1.0) ctmp = mtmp = ytmp = 0.0;

  else {

    ctmp = (ctmp - ktmp) / (1.0 - ktmp);

    mtmp = (mtmp - ktmp) / (1.0 - ktmp);

    ytmp = (ytmp - ktmp) / (1.0 - ktmp);

  }

  *c = (_JSAMPLE)((double)_MAXJSAMPLE - ctmp * (double)_MAXJSAMPLE + 0.5);

  *m = (_JSAMPLE)((double)_MAXJSAMPLE - mtmp * (double)_MAXJSAMPLE + 0.5);

  *y = (_JSAMPLE)((double)_MAXJSAMPLE - ytmp * (double)_MAXJSAMPLE + 0.5);

  *k = (_JSAMPLE)((double)_MAXJSAMPLE - ktmp * (double)_MAXJSAMPLE + 0.5);

}

rdbmp.c:rgb_to_cmyk

Line

Count

Source

29

12.7M

{

30

12.7M

  double ctmp = 1.0 - ((double)r / (double)_MAXJSAMPLE);

31

12.7M

  double mtmp = 1.0 - ((double)g / (double)_MAXJSAMPLE);

32

12.7M

  double ytmp = 1.0 - ((double)b / (double)_MAXJSAMPLE);

33

12.7M

  double ktmp = MIN(MIN(ctmp, mtmp), ytmp);

34

35

12.7M

  if (ktmp == 1.0) ctmp = mtmp = ytmp = 0.0;

36

11.3M

  else {

37

11.3M

    ctmp = (ctmp - ktmp) / (1.0 - ktmp);

38

11.3M

    mtmp = (mtmp - ktmp) / (1.0 - ktmp);

39

11.3M

    ytmp = (ytmp - ktmp) / (1.0 - ktmp);

40

11.3M

  }

41

12.7M

  *c = (_JSAMPLE)((double)_MAXJSAMPLE - ctmp * (double)_MAXJSAMPLE + 0.5);

42

12.7M

  *m = (_JSAMPLE)((double)_MAXJSAMPLE - mtmp * (double)_MAXJSAMPLE + 0.5);

43

12.7M

  *y = (_JSAMPLE)((double)_MAXJSAMPLE - ytmp * (double)_MAXJSAMPLE + 0.5);

44

12.7M

  *k = (_JSAMPLE)((double)_MAXJSAMPLE - ktmp * (double)_MAXJSAMPLE + 0.5);

45

12.7M

}

rdppm.c:rgb_to_cmyk

Line

Count

Source

29

9.45M

{

30

9.45M

  double ctmp = 1.0 - ((double)r / (double)_MAXJSAMPLE);

31

9.45M

  double mtmp = 1.0 - ((double)g / (double)_MAXJSAMPLE);

32

9.45M

  double ytmp = 1.0 - ((double)b / (double)_MAXJSAMPLE);

33

9.45M

  double ktmp = MIN(MIN(ctmp, mtmp), ytmp);

34

35

9.45M

  if (ktmp == 1.0) ctmp = mtmp = ytmp = 0.0;

36

2.09M

  else {

37

2.09M

    ctmp = (ctmp - ktmp) / (1.0 - ktmp);

38

2.09M

    mtmp = (mtmp - ktmp) / (1.0 - ktmp);

39

2.09M

    ytmp = (ytmp - ktmp) / (1.0 - ktmp);

40

2.09M

  }

41

9.45M

  *c = (_JSAMPLE)((double)_MAXJSAMPLE - ctmp * (double)_MAXJSAMPLE + 0.5);

42

9.45M

  *m = (_JSAMPLE)((double)_MAXJSAMPLE - mtmp * (double)_MAXJSAMPLE + 0.5);

43

9.45M

  *y = (_JSAMPLE)((double)_MAXJSAMPLE - ytmp * (double)_MAXJSAMPLE + 0.5);

44

9.45M

  *k = (_JSAMPLE)((double)_MAXJSAMPLE - ktmp * (double)_MAXJSAMPLE + 0.5);

45

9.45M

}

Unexecuted instantiation: wrbmp.c:rgb_to_cmyk

Unexecuted instantiation: wrppm.c:rgb_to_cmyk

/* Fully reversible only for C/M/Y/K values generated with rgb_to_cmyk() */

INLINE

LOCAL(void)

cmyk_to_rgb(_JSAMPLE c, _JSAMPLE m, _JSAMPLE y, _JSAMPLE k,

            _JSAMPLE *r, _JSAMPLE *g, _JSAMPLE *b)

{

  *r = (_JSAMPLE)((double)c * (double)k / (double)_MAXJSAMPLE + 0.5);

  *g = (_JSAMPLE)((double)m * (double)k / (double)_MAXJSAMPLE + 0.5);

  *b = (_JSAMPLE)((double)y * (double)k / (double)_MAXJSAMPLE + 0.5);

}

Unexecuted instantiation: rdbmp.c:cmyk_to_rgb

Unexecuted instantiation: rdppm.c:cmyk_to_rgb

Unexecuted instantiation: wrbmp.c:cmyk_to_rgb

Unexecuted instantiation: wrppm.c:cmyk_to_rgb

#endif /* CMYK_H */