On Feb 13, 2022, at 3:35 PM, Peter Miles via colorsync-users <colorsync-users@lists.apple.com> 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/