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hurodal
Known Participant
December 19, 2022

P: Color Sampler handing by History and Action steps is inconsistent

  • December 19, 2022
  • 12 replies
  • 723 views

Hi there, this is my first message here.

I've experienced an issue since many versions of Ps and I was hoping someone fix it but at the end I realized it's better to search where to tell someone to fix... and I finally came here.

This bug is still there since Photoshop CS or so until today. I'm using Windows 10 x64 and now Ps 24.0.1

Steps to see it:

  • Open an RGB image
  • Go to the Information tool
  • Place a color sample anywhere into the image with the color picker sample tool (shortcut I and then shift+clic) (sorry I'm using the spanish version of photoshop, so no sure the english name of it)
  • Select Lab color in the drop-down list in the color dropper icon just beside the R,G and B values in the Info tool:

 

BTW: In this very same drop-down list I bet 0-32768 is a small mistake, it should be 0-32767.

 

  • Do a color conversion from the actual color space to another one in RGB.
  • Go to History panel and go a step back. you'll see it automatically changes back to RGB instead of keeping Lab values. that's the bug.
  • If you change it again to Lab and go a step forward and then back again, you'll see the same behaviour.

I hope this helps you fix it. I know it's a small bug but sometimes when you're working with Lab values and readings it's very annoying.

Best regards from Barcelona.

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12 replies

rayek.elfin
Legend
December 19, 2022
quote

BTW: In this very same drop-down list I bet 0-32768 is a small mistake, it should be 0-32767.


By @hurodal

 

No, that is actually not a mistake. Photoshop's 16bit mode is a 15bit +1 mode.

 

If it were a true 16 bit mode the range would be 0 through 65,535.

But in Photoshop (for legacy performance reasons back in the 90s when the 16bit mode was implemented) the actual range is 0 through 32,767 + 1, which made it simpler and more efficient to calculate with in Photoshop's code.

 

That means that 0-32768 is correct for Photoshop's 16bit mode.

 

In other image editors you'd see a range of 0 through 65,535.

chrisg11235813
Participating Frequently
December 19, 2022

in the "Info Panel Options", if you change the First Colour Mode to Lab Color, does it still revert when converting to a new profile?