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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
  • 694 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.

This topic has been closed for replies.

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?