Get average color of image via Javascript

Question

Not sure this is possible, but looking to write a script that would return the average hex or rgb value for an image. I know it can be done in AS

Answer 1

Less accurate but fastest way to get average color of the image with datauri support:

function get_average_rgb(img) {
    var context = document.createElement('canvas').getContext('2d');
    if (typeof img == 'string') {
        var src = img;
        img = new Image;
        img.setAttribute('crossOrigin', ''); 
        img.src = src;
    }
    context.imageSmoothingEnabled = true;
    context.drawImage(img, 0, 0, 1, 1);
    return context.getImageData(1, 1, 1, 1).data.slice(0,3);
}