80 lines
1.7 KiB
C
80 lines
1.7 KiB
C
/*
|
|
* fimg-2gray.c
|
|
*/
|
|
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <unistd.h>
|
|
#include "string.h"
|
|
|
|
#include "../floatimg.h"
|
|
|
|
extern int verbosity; /* must be declared around main() */
|
|
|
|
/* --------------------------------------------------------------------- */
|
|
/*
|
|
* floating imgs MUST be allocated before calling this func.
|
|
*/
|
|
int fimg_mk_gray_from(FloatImg *src, FloatImg *dst, int k)
|
|
{
|
|
float kr, kg, kb, kdiv;
|
|
int nbb, foo;
|
|
|
|
kr = kg = kb = 1.0; /* canonic random values */
|
|
kdiv = kr + kg + kb;
|
|
|
|
/* we must check the validity of our parameters */
|
|
if (FIMG_TYPE_RGB != src->type) {
|
|
fprintf(stderr, "%s : bad src type %d on %p\n", __func__,
|
|
src->type, src);
|
|
return -8;
|
|
}
|
|
|
|
if (FIMG_TYPE_GRAY != dst->type) {
|
|
fprintf(stderr, "%s : bad dst type %d on %p\n", __func__,
|
|
dst->type, dst);
|
|
/*
|
|
* may be we can convert dst picture on the fly ?
|
|
*/
|
|
return -9;
|
|
}
|
|
|
|
/* entering the main processing loop */
|
|
nbb = src->width * src->height;
|
|
|
|
for (foo=0; foo<nbb; foo++) {
|
|
dst->R[foo] = ( (src->R[foo] * kr) +
|
|
(src->G[foo] * kg) +
|
|
(src->B[foo] * kb) ) /
|
|
kdiv;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
/* --------------------------------------------------------------------- */
|
|
int fimg_desaturate(FloatImg *src, FloatImg *dst, int k)
|
|
{
|
|
int foo, nbb;
|
|
|
|
/* we must check the validity of our parameters */
|
|
if (FIMG_TYPE_RGB != src->type || FIMG_TYPE_RGB != dst->type) {
|
|
fprintf(stderr, "%s : bad image type\n", __func__);
|
|
return -18;
|
|
}
|
|
|
|
/* entering the main processing loop */
|
|
nbb = src->width * src->height;
|
|
|
|
for (foo=0; foo<nbb; foo++) {
|
|
dst->R[foo] = dst->G[foo] = dst->B[foo] =
|
|
(src->R[foo] + src->G[foo] + src->B[foo]) / 3.0;
|
|
}
|
|
|
|
return -99;
|
|
}
|
|
/* --------------------------------------------------------------------- */
|
|
|
|
|
|
|
|
|