Re: Gray Gamma 2.2 space and Photoshop2022 (23.1.1)
Re: Gray Gamma 2.2 space and Photoshop2022 (23.1.1)
- Subject: Re: Gray Gamma 2.2 space and Photoshop2022 (23.1.1)
- From: Peter Miles via colorsync-users <email@hidden>
- Date: Sun, 13 Feb 2022 22:35:33 +0000
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- Thread-topic: Gray Gamma 2.2 space and Photoshop2022 (23.1.1)
Thanks Scott!!
Yes, all our workstations “working color space” are normally set to
AdobeRGB1998 and Gray Gamma 2.2 where I work. But on this workstation the
“working color space” is often changed, depending on the group of files being
worked on. And indeed, on this workstation PS 2022 is currently set to sRGB.
That explains it. Yes, of course, the reported RGB eye dropper values are seen
as a color conversion into a different colour space. From Grayscale space to
RGB space.
Phew !! …That such a relief.
QUESTION.
I always think of the “actual values” of greyscale files as being values from 0
to 255. Not a percentage, as the Photoshops eyedropper “actual values” report.
That’s my photography background.
In some situations, I want to know the actual 0-255 device values I'm sending
in a grayscale file. Not just the device values 'reinterpreted' as a percentage.
So how do you get photoshop to display the actual grayscale 0-255 values
encoded in a grayscale file I have open.
I can only use the RGB eyedropper display setting if I know in advance that my
RGB “working colour space” uses the same gray-axis encoding as the grayscale
file I have open? Or is there another way?
Thanks so much for your Help guys!!
Regards
Peter Miles
________________________________
From: Scott Martin <email@hidden>
Sent: Monday, 14 February 2022 6:09 am
To: email@hidden <email@hidden>
Cc: Peter Miles <email@hidden>
Subject: Re: Gray Gamma 2.2 space and Photoshop2022 (23.1.1)
On Feb 13, 2022, at 2:34 AM, Peter Miles wrote:
1: RGB pixel values stay the same when doing conversions from Gray Gamma 2.2
<-> Adobe RGB (1998) in Photoshop 2019.
Not necessarily!! The RGB values in the Info palette and Color Picker are
subject to your RGB Working Space and intent in Color Settings.
2: My understanding is that the Gray axis of Adobe RGB (1998) and the 'Gray
axis' of Gamma 2.2 space are identical. Values 0 to 255 encoded Gamma 2.2. So
the color meaning of RGB values along the gray axis of Adobe RGB (1998), and
the color meaning for the same 'RGB' value in gray gamma 2.2 space are also
identical.
Yes, but are you actually seeing AdobeRGB numbers in the Info palette and the
ColorPIcker? I bet you’re not. Again, show us your Color Settings in both
versions of Photoshop.
So that's a null conversion between them. And that expectation is being meet
with the behavior of Photoshop 2019. It does not change the RGB values for
gray, when converting in either direction between Adobe 1998 <-> Gray Gamma
2.2. But Photoshop 2022 does (on my install).
Maybe that’s because you have the defaults color settings with sRGB set as the
RGB Working space…
Also, what were your Color Setting when you mad the Grayscale file to begin
with? I suspect you could have made the file with sRGB set as your working
space so the 5,5,5 10,10,10 values were sRGB values - not AdobeRGB Gamma 2.2
values. Again, setting a grayscale file with RGB values is a funny thing to do
and subject to this type of error.
Silent Changes of RGB values in PS 2022:
This gets more interesting. I created a patches in PS 2019 in Gray Gamma 2.2
space. The RGB patch values were 0, 5, 10, 15, 20. I then saved it with Gray
Gamma 2.2 embedded. I opened the very same file in PS 2022. The eye dropper in
PS 2022 indicates that the RGB values have silently been changed (without any
pop-up warnings) to 0,1,3, 6,12. Yet the L* meaning of those new numbers did
not change. (all profile mis-match warnings are on.)
Yup, because your RGB Working Spaces are different between the two apps…. It’s
just calculating different values.
Any one else getting this sort of behavior with Photoshop 2022?
No they are both behaving identically for me when the Color Settings are synced.
Please show us your Color Settings in both apps before we take this
conversation further.
Scott Martin
www.on-sight.com<https://apc01.safelinks.protection.outlook.com/?url=http://www.on-sight.com/&data=04|01|email@hidden|d1c55b7a9b8441f9f3d808d9ef138b05|388728e1bbd0437898dcf8682e644300|1|0|637803689509736416|Unknown|TWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0=|3000&sdata=Mfbm11BkE3kqRN4jk7+6SD6Zte96DIOAiX14gYdfd9k=&reserved=0>
Imaging Science for Art
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