gistfile1.txt

    div#target
      | Dump
    div#target2
      | Load
    textarea#txtarea

    br/

    canvas id="tools_sketch" width="800" height="300" style="background: url(http://farm1.static.flickr.com/91/239595759_3c3626b24a_b.jpg) no-repeat center center;"


    javascript:
        $(function() {
          $('#tools_sketch').sketch({defaultColor: "#ff0"});
        }); 

        $("#target").click(function() {
          $('#txtarea').val( $('#tools_sketch')[0].toDataURL());
        }); 

        $("#target2").click(function() {
          loadCanvas($('#txtarea').val());
        });

        function loadCanvas(dataURL) {
        var canvas = document.getElementById('tools_sketch');
        var context = canvas.getContext('2d');

        // load image from data url
        var imageObj = new Image();
        imageObj.onload = function() {
          context.drawImage(this, 0, 0); 
        };  

        imageObj.src = dataURL;
        }