drewcassidy/nvidia-texture-tools
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Fix color weighting metric.

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castano
2007-12-13 06:29:03 +00:00
parent 5946514408
commit 6b016dae96
9 changed files with 42 additions and 202 deletions
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6
src/nvtt/CompressionOptions.cpp
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@ -76,13 +76,11 @@ void CompressionOptions::setQuality(Quality quality, float errorThreshold /*= 0.
/// The choice for these values is subjective. In many case uniform color weights
/// (1.0, 1.0, 1.0) work very well. A popular choice is to use the NTSC luma encoding
/// weights (0.2126, 0.7152, 0.0722), but I think that blue contributes to our
/// perception more than a 7%. A better choice in my opinion is (3, 4, 2). Ideally
/// the compressor should use a non linear colour metric as described here:
/// http://www.compuphase.com/cmetric.htm
/// perception more than a 7%. A better choice in my opinion is (3, 4, 2).
void CompressionOptions::setColorWeights(float red, float green, float blue)
{
float total = red + green + blue;
float x = blue / total;
float x = red / total;
float y = green / total;
m.colorWeight.set(x, y, 1.0f - x - y);