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: Mon, 14 Feb 2022 00:09:20 +0000
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- Thread-topic: Gray Gamma 2.2 space and Photoshop2022 (23.1.1)
Hi Scott.
<snip>
Gray again is yet another scale using 0-100%. And no, there is no 0-255
option/conversion.
But my understanding is that Grayscale pixel values are encoded using 0-255.
Not 0-100%.
If that's true, then surly no math would be required for photoshop to display
the 0-255 values?
If anything, I imagine math is needed to convert the 0-255 grayscale pixel
values to their equivalent ink% values?
And why doesn't photoshop eyedropper display the actual values for grayscale
file (i.e. 0-255) when "Actual Color" is selected for the eyedropper?
but instead, appears to display those values converted into 'ink % colospace' ?
Or am I missing something again.
Thanks again for your help!
Peter Miles
________________________________
From: Andrew Rodney via colorsync-users <email@hidden>
Sent: Monday, 14 February 2022 11:48 am
To: email@hidden <email@hidden>
Subject: Re: Gray Gamma 2.2 space and Photoshop2022 (23.1.1)
On Feb 13, 2022, at 3:35 PM, Peter Miles via colorsync-users
<email@hidden> wrote:
>
> 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?
In Photoshop, you can view the RGB triplets as 0-255 scale (or high bit) and in
Lightroom Classic it is 0-100 percent. I wish Adobe would provide both options
in both products so we could always bounce back and forth, the don't.
Gray again is yet another scale using 0-100%. And no, there is no 0-255
option/conversion.
Maybe someone far more mathematically skilled (I'm not) can provide a simple
calculation for each.
My 'solution' is sticking with Lab which is an option in ACR/LR/PS. But again,
I sure wish Adobe would simply allow us to toggle from each scale.
Andrew Rodney
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