Function adjust_brightness

pattern/canvas.js:3120–3124

(pixels, m)

        });
    }
    var adjust_brightness = function(pixels, m) {
        pixels.map(function(p) {
            return [p[0] + m, p[1] + m, p[2] + m, p[3]]; 
        });
    }
    var adjust_contrast = function(pixels, m) {
        pixels.map(function(p) {
            return [(p[0]-128)*m + 128, (p[1]-128)*m + 128, (p[2]-128)*m + 128, p[3]];