This is a demo for a Javascript / Canvas based implementation of my Superfast Blur algorithm. Usage: boxBlurImage( sourceImageID, targetCanvasID, radius, blurAlphaChannel, iterations ); or: boxBlurCanvasRGBA( targetCanvasID, top_x, top_y, width, height, radius, iterations ); or: boxBlurCanvasRGB( targetCanvasID, top_x, top_y, width, height, radius, iterations ); The "iterations" argument controls