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Go back to the old one, but gamma correct it

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Did more research into the subject, the formula I used before was fine and was just expecting gamma correction.
This commit is contained in:
Sally Coolatta 2022-12-15 22:29:38 -05:00
parent 4feba88327
commit 107ec27846
1 changed files with 12 additions and 6 deletions
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18
src/k_color.c
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@ -24,12 +24,18 @@
--------------------------------------------------*/
UINT8 K_ColorRelativeLuminance(UINT8 r, UINT8 g, UINT8 b)
{
// These are the BT.601 coefficents
// See also: https://en.wikipedia.org/wiki/Rec._601
UINT32 redweight = 299 * r;
UINT32 greenweight = 587 * g;
UINT32 blueweight = 114 * b;
return min((redweight + greenweight + blueweight) / 1000, UINT8_MAX);
double redWeight = ((r * 1.0) / UINT8_MAX);
double greenWeight = ((g * 1.0) / UINT8_MAX);
double blueWeight = ((b * 1.0) / UINT8_MAX);
double brightness = 0.5;
redWeight = pow(redWeight, 2.2) * 0.2126;
greenWeight = pow(greenWeight, 2.2) * 0.7152;
blueWeight = pow(greenWeight, 2.2) * 0.0722;
brightness = pow(redWeight + greenWeight + blueWeight, 1.0 / 2.2);
return (UINT8)(brightness * UINT8_MAX);
}
/*--------------------------------------------------