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html <canvas> is used to process multiple tiledImages to blend is a specific way. (special handling, when compositeOperation is 'source-over' and opacity is 1, useSketch is false, otherwise useSketch is true ) Valid values are 'source-atop', 'source-in', 'source-out', 'destination-over', 'destination-atop', 'destination-in', 'destination-out', 'lighter', 'copy' or 'xor' http://www.w3schools.com/tags/canvas_globalcompositeoperation.asp