Anyone Noticed....

sallyanne · **Posted:** Thu Nov 20, 2025 10:12 pm **(#1)**

GIMP Version: 3
Operating System: Windows
OS Version: 10
GIMP Experience: New User

... that desaturate doesn't turn coloured photos to grey anymore - unless you flatten them first. I usually get green/blue.
Only time I want to desturate coloured photos is when enhancing through highpass etc. Or is there some other way?

Wallace · **Posted:** Mon Nov 24, 2025 1:00 am **(#2)**

I have GIMP 3.0.4 installed and don't experience this issue.
You could convert the layer to RGB (perceptual) before desaturating,
to see if this helps.
You'll find this under the "layer right-click menu"
Layer → Composite Space → RGB (perceptual)
This might prevent the green/blue issue.

I think by flattening the image,
forces it back into a composited display color profile,
so desaturation behaves normally.
This is why i think “flatten image” magically fixes it.

sallyanne · **Posted:** Fri Nov 28, 2025 11:13 pm **(#3)**

Thankyou