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Add gamut mapping to properly bring colors outside of BT.709 back to it when we use color space correction

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This commit is contained in:
Filippo Tarpini
2026-04-11 23:31:17 +02:00
committed by GitHub
parent 33f62b0f9f
commit 8b362b7c51
1 changed files with 16 additions and 0 deletions
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16
Data/Sys/Shaders/default_pre_post_process.glsl
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@@ -440,12 +440,28 @@ void main()
if (OptionEnabled(correct_color_space))
{
float color_luminance = Luminance(color.rgb, false);
if (game_color_space == 0)
color.rgb = color.rgb * from_NTSCM;
else if (game_color_space == 1)
color.rgb = color.rgb * from_NTSCJ;
else if (game_color_space == 2)
color.rgb = color.rgb * from_PAL;
// Do gamut mapping to make sure all colors are within the BT.709 gamut.
// HDR doesn't need gamut mapping as all the color spaces above are within BT.2020.
if (!OptionEnabled(hdr_output))
{
float min_channel = min(color.r, min(color.g, color.b));
// Desaturate (move towards luminance/grayscale) until we are not out of gamut anymore (until no channel is below 0)
if (min_channel < 0.0 && color_luminance >= 0.0)
{
// Both division elements are meant to be negative so the ratio resolves to a positive value
float desaturate_alpha = (min_channel - color_luminance) != 0.0 ? (min_channel / (min_channel - color_luminance)) : 0.0;
color.rgb = lerp(color.rgb, color_luminance.xxx, desaturate_alpha.xxx);
}
}
}
if (OptionEnabled(hdr_output))