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Cryptomatte not precise enough
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Operating system: Windows 7
Graphics card: GeForce 660 x2

blender2.8 beta

Cryptomatte seems to be eroded or feathered inward, leaving a halo around the edge.

Exact steps for others to reproduce the error: Duplicate default cube multiple times, enable cryptomatte by object, enable 'Accurate Mode', render in Cycles with CPU. In the compositor, isolate a cube with the cryptomatte, use a color>multiply node to give it a color, and put it on top of the original image with an Alpha Over node. Observe halo.



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Brecht Van Lommel (brecht) closed this task as Archived.
Brecht Van Lommel (brecht) claimed this task.

This is a limitation of Cryptomatte. While it does produce accurate masks, it does not have the information to separate colors accurately. For that something like Deep EXR would be needed.