How to reduce the red color on image ?

[Stephen Liu]

(07-24-2022, 06:54 AM)sallyanne Wrote: - snip -

Value to the left - right make a picture lighter - darker
Red to the left - right will give you more red - green
Blue to the left - right will give you more blue - yellow
Green to the left - right will give you more green - magenta

Moving the center handle (small triangle icon)
Pls advise "Input Level" or "Output Level" ?

Thanks

Regards