On Sunday, September 26, 2021 11:58:42 AM CEST, Igor BEGHETTO via Cin
wrote:
I don't know how animejs works and I think it is a pity you can
not make a render with it (and using alpha channel).
In Cinelerra-GG there are "Chroma key" and "Chroma key (HSV)"
plugins for that but may be it doesn't work very well for your
goal. "Chroma key (HSV)" plugin is very powerful but you need to
work on it to achieve a good output.
The problem with Chroma key HSV is that it will clamp a light green color
to 'white' and not 'white+transparant'. At least that is my experience last
night. I am still interested (and motivated) to see the Color Erase happen
by the algorithm GIMP uses. I have found that ffmpeg has a blend filter,
but subtract is not equal to color erase.
What I have done during the early hours. I have implemented a QML Webkit
based browser. I am able capture the onscreen RGBA surface (yes, really...)
but because this is a single threaded effort I cannot do that at the
'native' speed to PNG. So I multiplied all the timing by 10, and captured
at 2.5fps, this gives me:
<http://stefan.konink.de/proRes444_output.mov>
--
Stefan
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