Gray Gamma 2.2 space and Photoshop2022 (23.1.1)
Gray Gamma 2.2 space and Photoshop2022 (23.1.1)
- Subject: Gray Gamma 2.2 space and Photoshop2022 (23.1.1)
- From: Peter Miles via colorsync-users <email@hidden>
- Date: Sun, 13 Feb 2022 02:31:15 +0000
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- Thread-topic: Gray Gamma 2.2 space and Photoshop2022 (23.1.1)
Hi List members
Adobe RGB (1998) is gamma 2.2. So I was surprised to see that Photoshop (2022
23.1.1) changed the RGB values of a step-wedge I made in Gray Gamma 2.2 space
after I converted it into Adobe RGB space. For example, in Gray Gamma 2.2 space
my wedge starts out with RGB values, 0,0,0 / 5,5,5 / 10,10,10 / 15,15,15 /
20,20,20…. and the AdobeRGB(1998) conversion goes 0,0,0 / 13,13,13 / 18,18,18
/ 22,22,22 / 27,27,27…
Hmm…
I just tried the same thing in Photoshop2019 and the RGB numbers stay the same
for the conversion from GG2.2 to adobeRGB(1998) and back again.
There are some other weird things happing with Photoshop 2022 handling of Gray
Gamma 2.2 space black point.
If I use a levels layer and lift the black point output level, I have to lift
it to 5 before an eye dropper on my image on full black patch, finally moves
from 0 to 1. That’s not right.
REQUEST
Can someone else on the list check this out. And let me know if you are seeing
the same behaviour?
Maybe there is something broken with our particular install?
I am going to stop using Photoshop 2022 with my GrayGamma 2.2 space images till
I can get to the bottom of this.
Regards
Peter Miles
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