Very bad banding since the latest update

Was having the same issue with very bad gradient banding in 27.8 (and 27.9 beta).  Initially had to downgrade back to 27.7 to fix the issue.  After reading some suggestions online,  I was able to turn off ‘Precise Color Management for HDR display’ (must quit and relaunch after) under the ‘Technology Previews’ setting, and it seemed to resolve the issue in 27.8 so far.

[Mac Studio M1 Max, OS Tahoe 26.5.1, Apple Studio Display with default Apple Display Profile]

Hey there,

Thanks for replying.

I’m using a Mac, Apple M2 Max 2023, OS Tahoe 26.5.1, Eizo CG247 monitor.

I updated Photoshop to 27.8, saw this issue, then re-installed 27.7 and the issue went away.

I haven't reset the preferences yet and it is happening on all images and layer masks.

I opened an image in PS27.8, saved out a JPG, which looked bad, then opened that JPG in PS27.7 and it looked OK.

The fact that it went back to normal after I re-installed version 27.7 tells me that the issue is with the update.

It’s also happening with Photoshop Beta 27.9.

Hope this info helps you.

Don't have this issue personally. Are you on Windows or Mac? Have you tried resetting preferences? Are the images identical after export / outside of PS? Is it happening on all files / images?