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welk171
Participating Frequently
August 25, 2025

P: Photoshop 26.10 Incorrect alpha blending on canvas for gamma 1.00 at different zoom levels

  • August 25, 2025
  • 2 replies
  • 422 views

Issue

  • Photoshop version: 26.10.0 20250811.r.7 x64 (final, Release)
  • OS: Windows 11 64-bit (10.0.26100.4946), 4070 RTX (mobile), i7-13700h, Windows HDR enabled


Steps to reproduce:

  1. Create a new 1000 x 1000 px document., RGB, 8 bit.
  2. In [Edit > Color Settings...] enable "Blend RGB colors using gamma 1.00".
  3. Enable [Settings > Technology Previews > Precise color management for HDR display], but
    it seems to be irrelevant (that's the only other setting I changed since Photoshop installation).
  4. Create 200 x 200 px, #00f blue raster square with 50% opacity ("Normal" blend).
  5. Ctrl + J to duplicate this layer.
  6. Group them.
  7. Fill bg to say #eee.
  8. Notice that the color they have is #6767f8 (correct I assume).
  9. Move the group with the Move Tool (V) and notice the color changed to #7f7ffb.
  10. Use zoom/pan (Z) and notice it flickered back to #6767f8.
  11. It's even possible to duplicate this group and fix both copies by the zoom tool
    and then drag only one of these groups with Move Tool (V) and screenshot this
    and clearly see the bug being screenshottable only on the group that was just dragged.


 

Expected result
Blending works consistently and produces always only #6767f8 blend.

Actual result:
Wrong blending only when gamma is 1.00.
It works with default settings for [Edit > Color Settings...].

2 replies

welk171
welk171Author
Participating Frequently
September 8, 2025

Same here in 2025, this is still not fixed, using Move (V) and Zoom (Z) tools changes the colors of my layers in gamma = 1.00 mode.

Legacy compositing is now gone and can't be enabled.

Photoshop version: 26.10.0 20250811.r.7 x64 (final, Release)
OS: Windows 11 64-bit (10.0.26100.4946), 4070 RTX (mobile), i7-13700h, Windows HDR enabled

Srishti Bali
Legend
September 8, 2025

Hi @welk171

 

Sorry to hear you’re running into this issue, and thank you for sharing details about your setup. Could you please share a short video showing the error, along with a sample file if possible? Also, can you confirm whether this happens with all files or only specific ones?

This information will help us reproduce the issue on our end and share the details with the Product team.

 

Regards,

Srishti

 

welk171
welk171Author
Participating Frequently
September 8, 2025
creative explorer
Community Expert
Community Expert
September 8, 2025

@welk171 learn something new! I guess I really didn't notice this on a MAC?

m
welk171
welk171Author
Participating Frequently
September 8, 2025

It was supposed to be a bug report but someone from Adobe moved it to "Discussions".

I think this is clearly a bug because simply using Move (V) and Zoom (Z) tools changes the canvas preview and at random alternates between correct and incorrect colors.

There is no response or interest from Adobe though but on Windows it's impossible to work in Gamma = 1.00 mode.

Sameer K
Community Manager
Community Manager
September 8, 2025

Hey, @welk171. Thanks for the detailed post. Although I don't have an HDR-certified primary display, one of my secondary screens was recently calibrated and HDR-certified. 

 

I've tried to recreate this with the detailed steps, and Photoshop behaved as expected (No color shifts). Could you include a video of the steps and your precise workflow? 

 

Awaiting to hear from you. Thanks!

Sameer K
(Type '@' and type my name to mention me when you reply)