Keying Node fails with values above 1 #53371
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Reference: blender/blender#53371
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System Information
elementaryOS 0.4.1, GTX980ti
Blender Version
Broken: 2.79.1,
58a15b2
Short description of error
The Keying Node does not key colors with values above 1 correctly.
I noticed this behavior with badly lit greenscreen footage, which I had exported as EXR with Linear ACES colorspace. No matter what I try, all areas which are overexposed, with color values above 1, are not keyed at all.
Other keying nodes, such as the Chroma Key, work just fine.
Exact steps for others to reproduce the error
I have attached a file with a very simple example. There are 2 colors, one with green channel at 0.95, one with green channel at 1.05. The darker one keys just fine, but not matter how I set the key color or clip the blacks etc., the inner square simply doesn't key correctly. If you try with the Chroma Key or any other keying node it works just fine. I guess there is some internal clipping happening in the Keying Node. But since we are working in a linear color space this really should not be happening.
clipping_keyingnode.blend
Changed status to: 'Open'
Added subscriber: @sebastian_k
Added subscriber: @SeanKennedy
This is currently expected behavior to consider all over-exposured areas as a non-screen because well, screen shouldn't be over-exposured. This was a big issue back to Trears of Steel with footage like tech. head with lamp.
However, we might try tweaking the condition here, so for example
P561: Patch for #53371
might work good for you. Give it a try!
That patch works great, thanks a lot! :)
But man, the ToS footage was soo much better than the one I have to deal with right now...
This issue was referenced by
6785a2bd66
Changed status from 'Open' to: 'Resolved'