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icc-brightness-gen.c
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icc-brightness-gen.c
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/*
* Copyright 2017 - 2019, Udi Fuchs
* SPDX-License-Identifier: MIT
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <lcms2.h>
cmsHPROFILE create_srgb_profile(double brightness)
{
cmsHPROFILE hsRGB = cmsCreate_sRGBProfile();
cmsMLU *mlu = cmsMLUalloc(NULL, 1);
char description[20];
snprintf(description, 20, "Brightness %.2f", brightness);
cmsMLUsetASCII(mlu, "en", "US", description);
cmsWriteTag(hsRGB, cmsSigProfileDescriptionTag, mlu);
cmsMLUfree(mlu);
cmsContext context_id = cmsCreateContext(NULL, NULL);
double curve[] = {1.0, brightness, 0.0}; // gamma, a, b for (a X +b)^gamma
cmsToneCurve *tone_curve[3] = {
cmsBuildParametricToneCurve(context_id, 2, curve),
cmsBuildParametricToneCurve(context_id, 2, curve),
cmsBuildParametricToneCurve(context_id, 2, curve),
};
cmsWriteTag(hsRGB, cmsSigVcgtTag, tone_curve);
cmsFreeToneCurve(tone_curve[0]);
cmsFreeToneCurve(tone_curve[1]);
cmsFreeToneCurve(tone_curve[2]);
return hsRGB;
}
int main(int argc, const char *argv[]) {
if (argc == 4 &&
strspn(argv[2], "0123456789") == strlen(argv[2]) &&
strspn(argv[3], "0123456789") == strlen(argv[3])) {
const char *filename = argv[1];
int brightness = atoi(argv[2]);
int max_brightness = atoi(argv[3]);
double ratio = (double)brightness / max_brightness;
cmsHPROFILE hsRGB = create_srgb_profile(ratio);
cmsSaveProfileToFile(hsRGB, filename);
return 0;
}
fprintf(stderr, "%s filename brightness max-brightness\n", argv[0]);
fprintf(stderr, "brightness and max-brightness must be integers.\n");
return 1;
}