> Is it not expected that the Sprite in the attached composition would > "disappear", when the Constant Color patch is set to pure Alpha black
Yeah, that's always been a real pain. I think it is the actual CIFilter that causes the problem (i.e. I have had similar issues using the CIFilter directly independent of QC). A workaround I've used is to send CIColor into Accumulator as the Replacing Image, and specify the image size on the Accumulator Pixels Wide/Pixels High. So replace your Image Crop with Accumulator. See attached modification of your composition. Andrew
ci.qtz
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