Edit in JSFiddle

$(document).ready(function(){
    $('.pixelArt').each(function() {
        if ($('<canvas>')[0].getContext) {
            var $thisDiv = $(this);
            var $canvas = $('<canvas>')[0];			
            var $tempCanvas = $('<canvas>')[0];
            var ctx = $canvas.getContext('2d');
            var tempCtx = $tempCanvas.getContext('2d')
            var squareSize = $thisDiv.data('size');
            $("<img/>").attr("src", $thisDiv.data('src')).load(function() {
                $canvas.width = this.width*squareSize;
                $canvas.height = this.height*squareSize;
                $thisDiv.append($canvas);
//The line below would be used but jsFiddle will not allow images from other hosts.
               // tempCtx.drawImage(this, 0, 0);
//Ignore the line below, use the one above.                
                tempCtx.drawImage($('#ignoreThis')[0], 0, 0);
                for (var row=0; row < this.height; row++){
                    for (var col=0; col < this.width; col++){
                        var pixelData=tempCtx.getImageData(col, row, 1, 1);                                                                     
                        ctx.fillStyle = 'rgba('+pixelData.data[0]+','+pixelData.data[1]+','+pixelData.data[2]+',255)';
                        ctx.fillRect(col*squareSize, row*squareSize, squareSize, squareSize);
                    }
                }                                           
            });				
        } else{
            $('.pixelArt').html("Sorry, Canvas element is not supported by your browser");
        }
    });
});
<div class="pixelArt" data-src="http://s25.postimg.org/r6uxtdjcr/image.png" data-size="10"></div>

<!-- getImageData is not accessable by jsFiddle from images hosted on a different domain. So we have to refernce the image below. -->
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