Classic convolution filters on top of component/convolve
var zelig = require('zelig');
var canvas = document.querySelector('canvas');
var ctx = canvas.getContext('2d');
var img = new Image;
img.onload = draw;
img.src = 'maru.jpg';
function draw() {
canvas.width = img.width;
canvas.height = img.height;
ctx.drawImage(img, 0, 0);
zelig
.emboss()
.canvas(canvas);
}