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Correct SIXEL HLS colour conversion

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Use the DEC hue origin and channel order, and round percentage and HLS conversions to the nearest byte value.
This commit is contained in:
Michael Grant
2026-08-03 12:08:28 +01:00
parent 52863f0fe9
commit 9731adb300
1 changed files with 8 additions and 7 deletions
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15
image-sixel.c
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@@ -429,9 +429,9 @@ sixel_colour_to_rgb(u_int colour, u_char *r, u_char *g, u_char *b)
double h, l, s, p, q;
if (type == 2) {
*r = ((colour >> 16) & 0x1ff) * 255 / 100;
*g = ((colour >> 8) & 0xff) * 255 / 100;
*b = (colour & 0xff) * 255 / 100;
*r = (((colour >> 16) & 0xff) * 255 + 50) / 100;
*g = (((colour >> 8) & 0xff) * 255 + 50) / 100;
*b = ((colour & 0xff) * 255 + 50) / 100;
return;
}
if (type != 1) {
@@ -443,14 +443,15 @@ sixel_colour_to_rgb(u_int colour, u_char *r, u_char *g, u_char *b)
l = ((colour >> 8) & 0xff) / 100.0;
s = (colour & 0xff) / 100.0;
if (s == 0) {
*r = *g = *b = l * 255;
*r = *g = *b = l * 255 + 0.5;
return;
}
q = l < 0.5 ? l * (1 + s) : l + s - l * s;
p = 2 * l - q;
*r = sixel_hue(p, q, h + 1.0 / 3) * 255;
*g = sixel_hue(p, q, h) * 255;
*b = sixel_hue(p, q, h - 1.0 / 3) * 255;
/* SIXEL HLS has blue at 0, red at 120 and green at 240 degrees. */
*r = sixel_hue(p, q, h) * 255 + 0.5;
*g = sixel_hue(p, q, h - 1.0 / 3) * 255 + 0.5;
*b = sixel_hue(p, q, h + 1.0 / 3) * 255 + 0.5;
}
/* Convert decoded SIXEL data into the protocol-neutral immutable image. */