Histogram tab Preferences in Lightroom Classic?

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Anyone know if I can change the RGB readings from % to 0-255? 
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@meat_pie

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Posted 4 months ago

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Edmund Gall

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I can see a way to show LAB values but not RGB in 0-255 in normal mode in Develop Panel. If you turn on Soft Proofing, it shows the RGB in 0-255, but you have to choose an ICC profile: https://www.lightroomqueen.com/community/threads/how-show-rgb-value-from-0-to-255-and-no-in.31026/

If you use a Mac, you can run the Digital Colour Meter (DCM) app from in Utilities (or Other Utilities): this shows, within the DCM window that opens, the RGB values in 0-255 of the pixel under the mouse cursor anywhere on the screen when you choose "Display native values" in the droplist. However, you will lose a bit of screen space for your LR window as the DCM window doesn't stay open above other windows when it's not in focus, i.e. when you start working within the other windows: so, you will have to put the DCM on one of your screen edges and reduce the size of your LR window in order to shpow both side by side. Explore the menu options to see what else DCM can give you (e.g. it can show RGB in HEX or percentage as well, as well as other formats besides RGB).

Hopefully, someone else has a more elegant solution in general (eg. something that shows the RGB values in a transparent tooltip attached to the cursor at all times or in a window that stays open above all others wven when not in focus?), or solutions for Windows (unsure what's the DCM equivalent in Windows)...
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@meat_pie

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Hi Edmund. Thanks for taking the time.

Losing my DCM window is exactly what I'm trying to do. It's the same info, but I'm intuitively 0-255.
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Andrew Rodney

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Apple Color Picker magnifying glass reads the data converted to the current display profile i.e. from the frame buffer. There is no way for the Color Picker to know what was the original image opened by an application and how it was displayed (ignore color issues - just how the pixels from the image are mapped to the app's window). Therefore only the app could read the data, LR in this case, is correctly reporting 0-255 image pixels.
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Andrew Rodney

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No, you cannot change the scale of RGB outside of soft proofing and the numbers provided in 0-100% are Melissa RGB as well.