[FFmpeg-user] colorchannelmixer: perceptual gamma

Paul B Mahol onemda at gmail.com
Sat Jan 23 21:36:24 EET 2021

On Sat, Jan 23, 2021 at 8:29 PM Phil Rhodes via ffmpeg-user <
ffmpeg-user at ffmpeg.org> wrote:

>  > I see that if I use
> > the Colours -> Components -> Channel Mixer tool and supplement the
> blue> channel (1.0) with the green channel (1.0)
> https://i.imgur.com/Q0qqgSP.png> the result is desaturated but usable
> https://i.imgur.com/t19QU4U.png
> I'd be a little cautious about this; have you tried it on other subjects?
> If it's just this clip then fine - I suspect your proposed solution is
> working well because the gate is actually supposed to be white. What you've
> created here is sort of a riff on very early two-colour film systems which
> used red and green; they sort of work in the same way this sort of works,
> giving a quasi-reasonable rendition of skin tones and foliage.
> If you have other situations, though, where you have subjects that are
> supposed to be just green, they'll end up cyan. I'm surprised it isn't more
> visible on the plants.
> I'd gently suggest that something like Resolve (free version available for
> major platforms) which allows you to get creative in how and where this
> stuff is applied.

Why you must always recommend alternative crappy solutions here?

> P
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