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Author Topic: Color banding with 10-bit color Asus PA329c  (Read 716 times)

David Eckels

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Color banding with 10-bit color Asus PA329c
« on: May 13, 2023, 02:44:20 pm »

New Asus PA329c display connected to NVIDIA GeForce RTX 2070 Super GPU on a Win11 machine. Win11 settings seem a little wonky because the Display Information shows Bit depth of 10, RGB, and a Color space of Standard dynamic range (SDR). Monitor On Screen Display (OSD) shows I am using the Adobe color space. Because of the discrepancy in what the monitor OSD shows and the Win11 OS (Adobe vs Standard color spaces, respectively), I decided to download the the 10-bit ramp image referenced by Andrew Rodney and verify that I could see no banding with that image using PS 24.4.1
Below I attach screen shots. I don't know if you can see what I see without a 10-bit monitor
1-The 10-bit ramp (psd from Andrew)
2-After changing mode from 16 to 32 bit and back again
3-The HDR Toning window with settings used when going from 32 to 16 bit mode
4-A simple gradient created within PS, but note the color bands to the left (darker) part of the gradient
To my eye the first two look like there's vertical banding. The fourth (my gradient) looks perfectly smooth. The first, upon initial opening in PS has discrete vertical banding, but they seem to be smoothed out by the Asus; jpg artifact?
There's always the possibility I am making this more difficult than it needs to be  ;D  but...
...I'd appreciate second opinions.
« Last Edit: May 13, 2023, 02:47:25 pm by David Eckels »
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digitaldog

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Re: Color banding with 10-bit color Asus PA329c
« Reply #1 on: May 13, 2023, 02:52:42 pm »

What does Photoshop show you in these prefs?
And you're viewing at 1:1 (100%) zoom?
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David Eckels

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Re: Color banding with 10-bit color Asus PA329c
« Reply #2 on: May 13, 2023, 04:48:13 pm »

Aaaahhh! Yet another lesson in details! The 30 bit display box was indeed unchecked (see below). I checked it, quit PS, and reloaded the psd file, smooth as a baby's butt this time. Color artifacts also seem to be resolved.

DRIVER UPDATE: I had downloaded the ASUS PA329c driver files, but hadn't read the instructions all the way through. After 3 hours wasted, I read them again and right clicked on the .inf file, installed it and, "Bob's yer uncle!" :-[

Lesson learned.
THANK YOU ANDREW! Once again...

digitaldog

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Re: Color banding with 10-bit color Asus PA329c
« Reply #3 on: May 13, 2023, 04:51:35 pm »

On the Mac, it's checked and grayed out automatically. But the importance is being set which is PS telling you: “I support a full 10-bit display path”.
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