30 bit display grayed out on Imac 2020 and Photoshop 22.3.0

[sasamihajlovic]

Hello,

I have an Imac 2020, i7, Radeon 5500xt, external monitor Benq SW320, and I am getting grayed out 30-bit display option. 

In my case, Photoshop doesn't use 10bit color.

I have used a test 16 bit gradient image and I can see the banding.

In Big Sur preview the test image doesn't have banding and In the graphic card system report, both of my monitors are 30bit capable.

I have tried reinstalling, resetting preferences, changing to high band cable. I have used several thunderbolt to display port cable and HDMI but still nothing.

Can somebody provide the solution?

Thanks!

[D Fosse · Accepted solution]

I know nothing about which configurations support 30 bit on Mac - but if this changed after updating to 22.3 see this:

https://feedback.photoshop.com/conversations/photoshop/photoshop-223-30-bit-display-and-advanced-dra... 

[sasamihajlovic]

Thank you very much. It seems that this is common in this version.