> 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

Attachment: ci.qtz
Description: Binary data

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