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Banding / Posterization on 10 bit test ramp image

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Getting pronounced banding when using Affinity Photo 1.8.1 (trial) to view a gray scale 10 bit test ramp image.

Same image displays smooth gradation, no banding, when viewed with OS X El Capitan's Preview app, which supports 10 bit depth.

Using OS X 10.11.6 on Mac Pro (Late 2013) with AMD FirePro D300 cards and a Dell UP2718Q monitor.

Wondering if Affinity Photo lacks 10 bit support for this platform or if it's just a configuration problem that prevents a smooth display of the image.

10_bit_test_ramp.psd

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Current Affinity apps send only 8 bpc to the display when the document is integer 16 bpc. (The apps do smoothly display your ramp on my iMac's 10-bit display when the document is converted to floating point 32 bpc, though.)

 

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I was afraid that was the case.  Can only hope Affinity will take advantage of the 10 bit display capability soon.  I like the organization and ease of use of the app.  It would help to know if this capability is in the near future plans or not. But I see a related issue (the absence of a 32-bit floating-point display in the color sampler) raised back in November 2018 remains in limbo.  

Thanks for the info!

 

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