This is a known bug. You'll just have to use it multiple times before you get it to actually remove all the colors. http://johnriselvato.com/ffmpeg-how-to-remove-all-colors-except-one-from-a-video/
On Sat, May 16, 2020 at 3:41 AM Michael Koch <astroelectro...@t-online.de> wrote: > 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 > > _______________________________________________ > ffmpeg-user mailing list > ffmpeg-user@ffmpeg.org > https://ffmpeg.org/mailman/listinfo/ffmpeg-user > > To unsubscribe, visit link above, or email > ffmpeg-user-requ...@ffmpeg.org with subject "unsubscribe". _______________________________________________ ffmpeg-user mailing list ffmpeg-user@ffmpeg.org https://ffmpeg.org/mailman/listinfo/ffmpeg-user To unsubscribe, visit link above, or email ffmpeg-user-requ...@ffmpeg.org with subject "unsubscribe".