This test shows how to use the canvas ImageData api with gfx. Two approaches are illustrated:

• How to use dojo aspect to do some image post-(or pre-) processing on the gfx scene. In this test, a title is drawn before drawing the gfx scene and a "negate color" filter is applied after. You should see a "blue" tiger.
• How to use the Surface.getImageData() (specific to the canvas renderer) to do one-shot image data operation. In this test, it applies a edge detection filter.

Detect Edges