12-14-2019, 09:20 AM
There are may ways to convert to grayscale. Color->Desaturate has five opfions!
The Gimp color selector can work wit three "color models", RGB, HSV, and LCh. With LChi if you don't change the L value, the resulting luminosity shouldn't change, LCh can be tricjy to work with (you can have out-of-gamut color (the purple ranges). In HSV, the "V" is a less accurate approximation of the perceveid luminosity, but is much easier to work with.
The Gimp color selector can work wit three "color models", RGB, HSV, and LCh. With LChi if you don't change the L value, the resulting luminosity shouldn't change, LCh can be tricjy to work with (you can have out-of-gamut color (the purple ranges). In HSV, the "V" is a less accurate approximation of the perceveid luminosity, but is much easier to work with.