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libobs,obs-filters: Align HDR to SDR disparity

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Adjust colors from BT.1886 to sRGB.
This commit is contained in:
jpark37 2023-04-15 21:01:01 -07:00 committed by Jim
parent b645ea6c5f
commit 901986cbf4
2 changed files with 18 additions and 12 deletions
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10
libobs/data/color.effect
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@ -42,14 +42,12 @@ float3 rec2020_to_rec709(float3 v)
return float3(r, g, b);
}
float reinhard_channel(float x)
{
return x / (x + 1.);
}
float3 reinhard(float3 rgb)
{
return float3(reinhard_channel(rgb.r), reinhard_channel(rgb.g), reinhard_channel(rgb.b));
rgb /= rgb + float3(1., 1., 1.);
rgb = pow(rgb, float3(1. / 2.4, 1. / 2.4, 1. / 2.4));
rgb = srgb_nonlinear_to_linear(rgb);
return rgb;
}
float linear_to_st2084_channel(float x)

20
plugins/obs-filters/data/color.effect
View File

@ -8,6 +8,16 @@ float3 srgb_linear_to_nonlinear(float3 v)
return float3(srgb_linear_to_nonlinear_channel(v.r), srgb_linear_to_nonlinear_channel(v.g), srgb_linear_to_nonlinear_channel(v.b));
}
float srgb_nonlinear_to_linear_channel(float u)
{
return (u <= 0.04045) ? (u / 12.92) : pow((u + 0.055) / 1.055, 2.4);
}
float3 srgb_nonlinear_to_linear(float3 v)
{
return float3(srgb_nonlinear_to_linear_channel(v.r), srgb_nonlinear_to_linear_channel(v.g), srgb_nonlinear_to_linear_channel(v.b));
}
float3 rec709_to_rec2020(float3 v)
{
float r = dot(v, float3(0.62740389593469903, 0.32928303837788370, 0.043313065687417225));
@ -24,14 +34,12 @@ float3 rec2020_to_rec709(float3 v)
return float3(r, g, b);
}
float reinhard_channel(float x)
{
return x / (x + 1.);
}
float3 reinhard(float3 rgb)
{
return float3(reinhard_channel(rgb.r), reinhard_channel(rgb.g), reinhard_channel(rgb.b));
rgb /= rgb + float3(1., 1., 1.);
rgb = pow(rgb, float3(1. / 2.4, 1. / 2.4, 1. / 2.4));
rgb = srgb_nonlinear_to_linear(rgb);
return rgb;
}
float linear_to_st2084_channel(float x)