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If you update canvas.backgroundcolor after rendering and do canvas.update(), the canvas' background color does not update. Added tests for that, and fixed the bug. I'm up for moving the fix to a different place, but the backend.clear() function was the most convenient location (since there was already an if statement that separated out the specific renderer I was looking to update, and gets called during every update()). Incoming PR for uvcdat-testdata to provide the images as well.