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(2 edits)

It just maps pixels (lighter: #cccc77, darker: #aaaa55). You can achieve the same (and faster) with a shader  I guess; but here I just do something like:

for(var i=0; i<data.length; i+=4) {
         data[i+0] = replaceColor[0];
         data[i+1] = replaceColor[1];
        data[i+2] = replaceColor[2];

(where components are red, blue and green colors and the 4th one would be alpha)