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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?
I know nothing about which configurations support 30 bit on Mac - but if this changed after updating to 22.3 see this:
Thank you very much. It seems that this is common in this version.