Function invert

pattern/canvas.js:3073–3079

(img)

var LUMINANCE = [0.2125 / 255, 0.7154 / 255, 0.0721 / 255];

function invert(img) {
    /* Returns an image with inverted colors (e.g. white becomes black).
     */
    return filter(img, function(p) {
        return [255-p[0], 255-p[1], 255-p[2], p[3]];
    });
}

function colorize(img, color, bias) {
    /* Returns a colorized image.