FFMPEG – CONVERT VIDEO TO GREYSCALE EXCEPT ONE COLOR? LEAVE ONE COLOR, THE REST BLACK & WHITE?

I have been researching and cannot find anything on how to preserve just one color / color range; while converting a video to greyscale / black & white using FFMPEG. For example; all black and white, except the peoples Blue Jeans, etc.

Anyone know how to do this in FFMPEG?

Thanks in advance.

I haven’t actually found anything that has promise to achieve this. Of course I know how to convert everything to greyscale / black & white. But, not just leave the color / color range.