Messed around with it for a bit: <a href="https://0x0.st/fPF.webm" rel="nofollow">https://0x0.st/fPF.webm</a><p>Used:
-filter_complex "[0:v] selectivecolor=greens='0 1 0':yellows='-1 -1 1':magentas='1 0.5 -1':blues='1 -0.9 1':reds='-1 0.1 -1' [x] ; [0:v] scale=w=360:h=-1 [y] ; [x] [y] overlay=format=yuv420 [out]" -map "[out]"