Function adjust_hue

pattern/canvas.js:3107–3113

(pixels, m)

     */
    var pixels = new Pixels(img);
    var adjust_hue = function(pixels, m) {
        pixels.map(function(p) {
            var hsb = _rgb2hsb(p[0]/255, p[1]/255, p[2]/255);
            var rgb = _hsb2rgb(Math.clamp((hsb[0] + m) % 1, 0, 1), hsb[1], hsb[2]);
            return [rgb[0]*255, rgb[1]*255, rgb[2]*255, p[3]]; 
        });
    }
    var adjust_saturation = function(pixels, m) {
        pixels.map(function(p) {
            var i = (0.3*p[0] + 0.59*p[1] + 0.11*p[2]) * (1-m);