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: Andrew Rodney via colorsync-users <email@hidden>
- Date: Sun, 13 Feb 2022 15:48:47 -0700
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
http://www.digitaldog.net/
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