HP Dreamcolor luminance/contrast question

[Jeremy Haccoun]

Hello,

I have a question about the HP Dreamcolor z24x for VFX and color work. When set to BT. 709, the luminance is very low, which is of course normal for Rec.709. However I am used to work on monitors with much stronger luminance/contrast levels. So my question is, is it a problem to enable the "dynamic contrast" option in the menu and does it affect in any way the color accuracy of the Rec.709 calibration? Or as an alternative, I could set the luminance to taste/max (which is at 28 on factory calibration).

Thanks for your advice
Jeremy

 

[Maz Mawlawi]

what is your luminance set as? and what is your gamma set as?

 

[Jeremy Haccoun]

When using the BT.209 preset, Gamma is at 2.4 and Luminance at 120 cd/m2 (this is translated as 28 out of 100 on their luminance threshold)

 

[Jeremy Haccoun]

BT.709 I mean

 

[jussi rovanpera]

The viewing environment plays a part here. 2.4 and 120cd should be viewed in a fairly dark environment. Lighter environment will reflect off the screen and reduce contrast.

 

[Marc Wielage]

The internal settings and control labels mean very little. You've got to actually calibrate the monitor from a color-managed output or it's simply not going to work. And most colorists I know are not happy with the Dreamcolor monitors.

 

[Jeremy Haccoun]

Thanks Marc, I've calibrated the monitor internally using the HP X-rite iDisplay Pro, I just want to make sure that I'm not affecting my calibration by adjusting the luminance to taste

 

[Marc Wielage]

Thanks Marc, I've calibrated the monitor internally using the HP X-rite iDisplay Pro, I just want to make sure that I'm not affecting my calibration by adjusting the luminance to taste

If the overall peak white video level isn't 100 nits (standard for Rec709 / BT1886), you've got a problem:

https://www.itu.int/dms_pubrec/itu-r/rec/bt/R-REC-BT.1886-0-201103-I!!PDF-E.pdf

There are over 320 messages in this thread on LiftGammaGain as to the problems with the Dreamcolor monitors in general

http://liftgammagain.com/forum/index.php?threads/new-hp-dreamcolor-monitors-4k-capable.2694/

 

[Jeremy Haccoun]

Thank you!

 

[Jeremy Haccoun]

Thanks for those links - After extensive reading I upgraded to Eizo CS240.

I've read a lot in the forums that it makes sense to use a Blackmagic decklink to send a broadcast video signal to the monitor.
How much of a difference is that compared to connecting my NVidia GeForce Quadro K1000M via DisplayPort to the reference monitor?

Thanks

 

[Marc Wielage]

The Eizos are actually not bad. You do have to use a color-managed output for color correction, and as far as I know Resolve will only recognize Blackmagic Design video cards and playback devices. It's also possible to calibrate through the Blackmagic output directly from Resolve's signal generators, provided you have the compatible software and sensors (pp. 485-486 in the manual).

 

[Jeremy Haccoun]

Thanks. Sorry if this has been asked before, but can you tell me why the output has to be color-managed if the monitor is already calibrated?
Is it a problem to send my GeForce Quadro output to the calibrated Eizo via DisplayPort? (I'm in Speedgrade)