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Plazmodeus
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10bit color on Dell P2715q

Sat Nov 18, 2017 5:00 pm

Comrade Gerbils
I have two Dell 27" monitors, u2711 and P2715q, both 10-bit capable monitors, running off GTX 1070 via Dp cables on Windows 10. Using the Nvidia control panel, I can set the older monitor, the U2711, to 10bpc color, but I cannot do the same with the P2715q, which should be able to. Does anyone know how to force this functionality?

Thanks in advance.

-(A)-
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Ryu Connor
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Re: 10bit color on Dell P2715q

Sat Nov 18, 2017 6:55 pm

According to this thread the monitor EDID does not properly report 10-bit color. So you'd need some way to override the EDID and I'm not sure that's worth the trouble. PowerStrip used to be an option for such things, but that software is dead.

It's not technically a 10-bit panel, but instead 8-bit + FRC (dithering).

As a monitor with an sRGB color space, 10-bit color is largely pointless. So many metamers.
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Plazmodeus
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Re: 10bit color on Dell P2715q

Sat Nov 18, 2017 8:09 pm

Thanks Ryu. Sadly I didn't see that post when I was searching for this, or even when buying the monitor. I got 10bpc working on the U2711 and it looks gorgeous. I wonder if it's worth trying an EDID hack just to see what AFR deep color looks like.
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Airmantharp
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Re: 10bit color on Dell P2715q

Sun Nov 19, 2017 12:23 am

Plazmodeus wrote:
I got 10bpc working on the U2711 and it looks gorgeous.


Can you detail what you mean? In theory, there should be no difference with the same content :D.
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Plazmodeus
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Re: 10bit color on Dell P2715q

Sun Nov 19, 2017 11:05 pm

@airmantharp I have a Nikon D800 and viewing 14bit/Adobe RGB raw files in Lightroom or Photoshop in 10bit colour looks more 'lush' than 8bit colour. If you were standing at my desk and I toggled between 8bpc/10bpc I believe you'd agree. With a good camera it's an obvious upgrade.
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Airmantharp
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Re: 10bit color on Dell P2715q

Mon Nov 20, 2017 7:33 am

Plazmodeus wrote:
@airmantharp I have a Nikon D800 and viewing 14bit/Adobe RGB raw files in Lightroom or Photoshop in 10bit colour looks more 'lush' than 8bit colour. If you were standing at my desk and I toggled between 8bpc/10bpc I believe you'd agree. With a good camera it's an obvious upgrade.


Let me preface by saying that I absolutely believe that you are seeing what you're stating- the challenge is that what you're seeing may not be what you should be seeing.

It sounds like you have a different calibration between the two modes.

What I'm getting at is that 8bit and 10bit both have the same 'colors', and the same range; what's different is that 10bit affords significantly more steps of gradation, and so less banding should be seen for the same content.

You may also be switching color profiles as well, i.e. SRGB to ARGB, and Adobe may be doing some of that for you; it's not something I've had a chance to work with on my system, no 10bit here (yet). Main thing is that when you take a picture of blue with your D810, it should still be 'blue' on your monitor, whether set to 8bit or 10bit, SRGB or ARGB, etc.


[the hell of getting all of this mess calibrated, and then having to deal with the different color spaces, is why I've honestly avoided 10bit; however, when MS gets their act together with HDR, I'll be looking to jump, as that takes care of a lot of the issues for general usage]
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Re: 10bit color on Dell P2715q

Mon Nov 20, 2017 8:14 am

Just to chime in on this and concur with Airmantharp.

Our graphics department spends significant amounts of time, money and effort on professional screen and printer calibration, so they know what they're talking about.

If you can see any obvious difference between 8-bit and 10-bit colour, there's something horribly wrong with your colour profiles or output range. A colour value at 8-bit should look exactly the same at 10-bit, unless there's a mapping problem between the source colour space and the screen colour space.

The ONLY time you should see any difference between 8-bit and 10-bit is reduced colour banding on very smooth gradients over a large number of pixels. Normally the noise/film-grain in even the highest-quality RAW images from state of the art cameras will obfuscate this by adding a pseudo-dithering anyway, but you'll find that 8-bit and 10-bit are most visibly different on artificially-generated images, where there is no noise to start with, or in photos that have had noise-reduction applied.

Perhaps I'm preaching to the choir, but when you said "more lush" I interpret that is "more vivid, more contrast, or more saturation". This is absolutely wrong and you should fix that, rather than worrying about 8-bit/10-bit, especially since one of your panels is only 8-bit anyway.
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