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@GIMP I wish I could claim ownership of the image, but it's a screenshot I'm adjusting for a gaming blog.

Different colour profiles, hmm. With colour management turned off I get these images.

I'm going to see if I can reproduce the only-one-contrast on an older version of the GIMP AppImage.

It just feels like G3's contrast has bigger "steps" than G2.

@GIMP Oh I see what's going on.

To get the same level of darkness from "1 Contrast" in Gimp3, I had to set a contrast of 7-8 in Gimp 2.

So, is there something missing in how I've set up #GIMP3 that means it's making larger jumps in G3?

@FibroJedi Not sure. is your image at the same encoding/precision (e.g. RGB 8bits)? Also check with colour management turned off in the view menu to see it's not a profile difference.

@GIMP

1. I used the same image file in both tests, I just used different layers to display the outputs.But yes, it's RGB-8 set in 2.10 and 3.0.

2. Colour managing off made no difference.

I meant to dig into this while it was GIMP 2.99 but I just never got around to it. And I assumed I'd done something wrong, so "User Error" is not a "Bug" (with the software anyway, just...the user).

@FibroJedi it might be a bug, or at least a difference - please do feel free to file an issue; there's a link at the foot of gimp.org to file a bug, and we can look in more detail. Thanks!

In the meantime reducing opacity in Blending Options may be a workaround to explore.

@GIMP Aye, I will use your workaround for now. I'll leave the bug report as the one I did yesterday turned out not to be one because it was mentioned 1-2 years ago and I hadn't searched that far back before filing. I don't want to waste anyone's time.

Hopefully someone else will spot it and I can support it then.

But thank you so much for your time, I appreciate it.

@FibroJedi it’s not a waste of time - it helps us know it affects more people.

I did find this though - https://gitlab.gnome.org/GNOME/gimp/-/issues/13174

@GIMP Now I need to research colour theory and how GIMP3 interprets light differently. I've tried using levels, but I was so used to how Brightness/Contrast works it was enough.

I've "thumbed-up" that thread. As it's a known issue, is there any point in filing it now?

@FibroJedi i don't know for sure it's the same thing, so if you hav more to add feel free, no point making a new report indeed. Thanks!