Hi,
I just found out that the colorhold filter doesn't behave as described.
In the documentation is written:
similarity
Similarity percentage with the above color. 0.01 matches only the exact
key color, while 1.0 matches everything.
But when I use similarity=1.0, it matches a wide range of colors, but
not everything. Can be reproduced as follows:
ffmpeg -f lavfi -i color=black:s=1280x256 -vf
geq=r='clip(512-X,0,255)+clip(X-1024,0,255)':g='lt(X,512)*clip(X,0,255)+gte(X,512)*clip(1024-X,0,255)':b='lt(X,1024)*clip(X-512,0,255)+gte(X,1024)*clip(1536-X,0,255)',oscilloscope=tw=1:s=1
-frames 1 -y spectrum.png
ffmpeg -i spectrum.png -filter_complex
colorhold=color=00FF00:similarity=1.0:blend=0 -y out.png
Michael
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