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Alpha-weighted colour averaging

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Lucas Dower 2022-06-12 02:20:35 +01:00
parent 687ed7159a
commit 0b7fa7da36
2 changed files with 941 additions and 940 deletions
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1862
res/atlases/vanilla.atlas
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19
tools/misc.ts
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@ -37,19 +37,20 @@ export function getAverageColour(image: PNG): RGBA {
for (let y = 0; y < image.height; ++y) {
const index = 4 * (image.width * y + x);
const rgba = image.data.slice(index, index + 4);
r += rgba[0];
g += rgba[1];
b += rgba[2];
a += rgba[3];
weight += rgba[3];
const alpha = rgba[3] / 255;
r += (rgba[0] / 255) * alpha;
g += (rgba[1] / 255) * alpha;
b += (rgba[2] / 255) * alpha;
a += alpha;
weight += alpha;
}
}
const numPixels = image.width * image.height;
return {
r: r / (255 * numPixels),
g: g / (255 * numPixels),
b: b / (255 * numPixels),
a: a / (255 * numPixels),
r: r / weight,
g: g / weight,
b: b / weight,
a: a / numPixels,
};
}