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Decklink 10-bit GUI output?

PostPosted: Wed Jun 27, 2018 7:10 am
by Karel Voners
I invested in a 10 bit monitor so I also need to upgrade my gpu or output solution to support 10-bit.

I was hoping I could still use my new monitor in tasks like photoshop and make use of 10-bit like I would be able to using a quadro. Is this possible when I drive this using a decklink card?

Cheers,
Karel.

Re: Decklink 10-bit GUI output?

PostPosted: Wed Jun 27, 2018 6:03 pm
by Jack Fairley
No, you'll have to connect the monitor to your graphics card to do that.

Re: Decklink 10-bit GUI output?

PostPosted: Thu Jun 28, 2018 10:02 pm
by Karel Voners
Ok, but does it still function as a normal GUI display output, just in 8-bit? Or wil the monitor not display anything unless using resolve, premiere or supported apps like photoshop?

Cheers!
Karel.

Re: Decklink 10-bit GUI output?

PostPosted: Thu Jun 28, 2018 10:52 pm
by Jack Fairley
Karel Voners wrote:Ok, but does it still function as a normal GUI display output, just in 8-bit? Or wil the monitor not display anything unless using resolve, premiere or supported apps like photoshop?

Cheers!
Karel.

It does not appear as a monitor to the OS like you are expecting. It will only work with apps that support using a BMD output device, and that support is for fullscreen video output.

Re: Decklink 10-bit GUI output?

PostPosted: Thu Jun 28, 2018 11:04 pm
by Craig Marshall
In professional video production, 10bit and colour accuracy on your GUI monitors is not particularly important. On the other hand, your Decklink card guarantees you see a reliable 'Video' signal feed to your full screen Reference Monitor which should map pixels at 1:1. Running a full screen display direct from your GPU will only offer your computer's 'interpretation' of a Video signal which could be quite misleading.

Your Reference Monitor's correct calibration (to Rec.709 for example) is far more important than whether it shows an 8bit or 10bit display.

Re: Decklink 10-bit GUI output?

PostPosted: Fri Jun 29, 2018 12:16 am
by JPOwens
Craig Marshall wrote:on your GUI monitors is not particularly important.


The image on the User Interface is not particularly important re: grading judgement -- but yes, on the Decklink grade monitor output, it is. Eight- or Ten- bit'tedness doesn't contribute to chromatic accuracy per se, but higher chroma depth will yield a smoother rendition. It will tend to hide 8-bit issues that may result in later compressions when the bit-depth is reduced (banding #1 issue). This will be a more serious issue with HD, and even more serious with UHD resolutions, where 12-bit is really more appropriate.

jPo, CSI

Re: Decklink 10-bit GUI output?

PostPosted: Fri Jun 29, 2018 12:43 am
by Craig Marshall
Yes, I use a calibrated IPS Computer monitor as a Rec.709 Reference where we see a 10bit RGB 4:4:4 display. This HD monitor is driven from a 12G Decklink card via an SDI to Display Port converter but it is a Computer monitor, not a proper Video monitor.

If I was offered for example, an 8bit HD, FSI AM210 SDI 'Video' monitor for the same price as a 10bit 4K 'Computer' Monitor, I would chose the 8bit FSI every time. Depending on your client base, correct calibration can be far more important than 8bit vs 10bit.

Worth noting too that a correctly calibrated HD Video monitor can still be used to Grade 4K material as several 12G Decklink options have on-board hardware 4K > HD down-converters.