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	blind-colour-srgb.c - blind - suckless command-line video editing utility
	git clone git://git.suckless.org/blind
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	---
	blind-colour-srgb.c (1000B)
	---
	1 /* See LICENSE file for copyright and license details. */
	2 #include "common.h"
	3
	4 USAGE("[-% format] [-d depth] [-l] red green blue")
	5
	6 int
	7 main(int argc, char *argv[])
	8 {
	9 unsigned long long int max;
	10 double red, green, blue, X, Y, Z;
	11 int depth = 8, linear = 0;
	12 const char *fmt = NULL;
	13
	14 ARGBEGIN {
	15 case 'd':
	16 depth = etoi_flag('d', UARGF(), 1, 64);
	17 break;
	18 case 'l':
	19 linear = 1;
	20 break;
	21 case '%':
	22 fmt = UARGF();
	23 break;
	24 default:
	25 usage();
	26 } ARGEND;
	27
	28 if (argc != 3)
	29 usage();
	30
	31 fmt = select_print_format("%! %! %!\n", DOUBLE, fmt);
	32
	33 max = 1ULL << (depth - 1);
	34 max \|= max - 1;
	35 red = etolf_arg("the red value", argv[0]) / (double)max;
	36 green = etolf_arg("the green value", argv[1]) / (double)max;
	37 blue = etolf_arg("the blue value", argv[2]) / (double)max;
	38 if (!linear) {
	39 red = srgb_decode(red);
	40 green = srgb_decode(green);
	41 blue = srgb_decode(blue);
	42 }
	43
	44 srgb_to_ciexyz(red, green, blue, &X, &Y, &Z);
	45 printf(fmt, X, Y, Z);
	46 efshut(stdout, "<stdout>");
	47 return 0;
	48 }