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* Includes sound 🔊
I have updated the script for this FFmpeg 'rainbow' effect I created in 2017¹ as there were numerous flaws, errors, and inadequacies in that earlier version. One major issue was the inability to colorkey with any colour other than black; this has been resolved.
This time, the effect is based on the 'extractplanes' filter and the alpha levels created after using a 'colorkey' filter. This produces a much more refined result; better colour shaping, and maintains most of the original foreground subject. This 'extractplanes' filter can even be removed from the filtergraph, to create an alternative, more subtle effect.
