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Clamp before gamma correction

master
Kenny Levinsen 2020-09-12 21:14:28 +02:00
parent b45f5b7d31
commit 45dec286c5
1 changed files with 6 additions and 6 deletions
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12
main.c
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@ -173,9 +173,9 @@ static double clamp(double value) {
static void xyz_to_srgb(double x, double y, double z, double *r, double *g, double *b) { static void xyz_to_srgb(double x, double y, double z, double *r, double *g, double *b) {
// http://www.brucelindbloom.com/index.html?Eqn_RGB_XYZ_Matrix.html // http://www.brucelindbloom.com/index.html?Eqn_RGB_XYZ_Matrix.html
*r = srgb_gamma(3.2404542 * x - 1.5371385 * y - 0.4985314 * z, 2.2); *r = srgb_gamma(clamp(3.2404542 * x - 1.5371385 * y - 0.4985314 * z), 2.2);
*g = srgb_gamma(-0.9692660 * x + 1.8760108 * y + 0.0415560 * z, 2.2); *g = srgb_gamma(clamp(-0.9692660 * x + 1.8760108 * y + 0.0415560 * z), 2.2);
*b = srgb_gamma(0.0556434 * x - 0.2040259 * y + 1.0572252 * z, 2.2); *b = srgb_gamma(clamp(0.0556434 * x - 0.2040259 * y + 1.0572252 * z), 2.2);
} }
static void calc_whitepoint(int temp, double *rw, double *gw, double *bw) { static void calc_whitepoint(int temp, double *rw, double *gw, double *bw) {
@ -195,9 +195,9 @@ static void calc_whitepoint(int temp, double *rw, double *gw, double *bw) {
xyz_to_srgb(x, y, z, rw, gw, bw); xyz_to_srgb(x, y, z, rw, gw, bw);
double maxw = fmaxl(*rw, fmaxl(*gw, *bw)); double maxw = fmaxl(*rw, fmaxl(*gw, *bw));
*rw = clamp(*rw / maxw); *rw /= maxw;
*gw = clamp(*gw / maxw); *gw /= maxw;
*bw = clamp(*bw / maxw); *bw /= maxw;
} }
static const char usage[] = "usage: %s [options]\n" static const char usage[] = "usage: %s [options]\n"