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Avoids scaling luminance prior to extracting chrominance.

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Thomas Harte
2019-01-17 20:52:33 -05:00
parent 5ceb711bd3
commit a6683cb9b8
1 changed files with 2 additions and 1 deletions
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3
Outputs/OpenGL/ScanTargetGLSLFragments.cpp
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@@ -437,8 +437,9 @@ std::unique_ptr<Shader> ScanTarget::conversion_shader(InputDataType input_data_t
// Take the average to calculate luminance, then subtract that from all four samples to
// give chrominance.
"float luminance = dot(samples, vec4(0.25 / (1.0 - compositeAmplitude)));"
"float luminance = dot(samples, vec4(0.25));"
"samples -= vec4(luminance);"
"luminance /= (1.0 - compositeAmplitude);"
// Split and average chrominance.
"vec2 channels = vec2("