RGB curves - Why does adjusting the G curve also result in a change in R and B channels?

[sovereign (Matteo Costa)]

@heckflosse

@sovereign

I expect it to be 50 %

It’s 50% in working space (e.g. ProPhoto), but ~61.2% in sRGB output space if working space is ProPhoto.

Thanks, I see it is all about re-mapping the RGB coordinates in different color spaces.