HP Dreamcolor Gamma setting?

[Kevin Cannon]

Hey Andrew, are you using the Dreamcolor APS and Dreamcolor probe? The gamma option usually pops up in the advanced page once you’ve selected the monitor as 2480zx…

One weird thing about it, the Dreamcolor must be connected via USB for the advanced page to show up, even if you aren’t otherwise plugging USB devices in… Unless they’ve changed it, there’s no warning to tell you that you’re missing out on the advanced page…

KC

Prehistoric Digital
PhD Grading Suite

[Andrew Smith]

Hey Kevin,

I am on a mac system so i had to lug over a friends pc tower just to be able to update the firmware…i did not download or use any of the other stuff since it would require using the pc to adjust etc, and no i do not use a probe because i had been doing it by eye and now i have a calibration expert coming to me to probe both the dreamcolor AND my plasma to match rec. 709 – sounds like what you are saying is that I need that application to launch from the pc in order to change the gamma to 2.2?

can you explain in any further detail about this?

thank you

MacPro 4,1 OSX 10.6.8 / FCS3 / CS5
2.26 ghz 8-core / 24GB RAM
Nvidia GT 120/285 combo

[Kevin Cannon]

Yeah, the Advanced Profiling Solution works with the Dreamcolor probe, and as far as I know it’s the only way to manage certain aspects of the Dreamcolor color management… the good news is, it’s available for your Mac, so no need to lug a PC over to work with it… the bad news is it’s an extra 350 bucks.

But talk to your calibration person, mine once told me that the probe is specific to the Dreamcolor because there there is a physical difference between it and other xrite probes (some filtration) and that he needed to use that software and probe alongside his non-contact probe in order to get at all the controls. Things might have changed though, I switched to an FSI about a year ago…

KC

Prehistoric Digital
PhD Grading Suite

[Andrew Smith]

oh man you would think the guy would have said something about this when i mentioned the Dreamcolor…however after looking thru each of the downloading on HP’s driver page i think the HP Display Assistant Utility is the software that might allow me access to changing Gamma and correct me if i am wrong but this does not require the probe to use?

Maybe if i try that and can change the gamma to 2.2 (like the FSI default rec. 709 shipping setup) then hopefully he can have enough control of settings on the monitor itself to get it calibrated with his probe’s.

Just curious – onyour FSI did you leave it as 2.2 rec. 709 or do you switch to other settings when doing film or web stuff not needing rec. 709 specs?

thanks for you input – really makes me sick of dealing with the Dreamcolor – needles to say the tech support is terrible compaired to FSI 🙂

here is a link to what I am talking about…hopefully if i launch this software i can adjust the gamma for rec.709 which is not adjustable on my monitor it seems.

https://h20000.www2.hp.com/bizsupport/TechSupport/SoftwareDescription.jsp?lang=en&cc=us&prodTypeId=382087&prodSeriesId=3648397&prodNameId=3648398&swEnvOID=228&swLang=13&mode=2&taskId=135&swItem=ir-95082-1

[Kevin Cannon]

Possibly there’s another way… that’s just how I used to do it. The tech support from HP is a nightmare. You probably already determined this, but basically nobody in the company is aware that the product even exists… I actually went through 6 different displays because nobody seemed to know or care about the quality issues, they were just willing to pay for shipping for a replacement… SIX TIMES. I still have the last one, it’s about to go onto an assistant station…

For the FSI and the projector I use 2.2 for Rec. 709 material, sometimes DCI at 2.6.

KC

Prehistoric Digital
PhD Grading Suite

[Andrew Smith]

yeah its SO bad, you might as well have purchased it from some shady company in china or wherever – i cant wait to be able to afford an FSI 10 bit monitor or OLED once it catches some more traction in the market just to not have to deal with the HDLINK box and HP issues – it is very much not a ‘confidence’ monitor 🙂

MacPro 4,1 OSX 10.6.8 / FCS3 / CS5
2.26 ghz 8-core / 24GB RAM
Nvidia GT 120/285 combo

[Andrew Smith]

Just to clarify – did you leave it on rec.709 gamma 2.4 when you were using it? i seem to not be able to change gamma with this software either…will try the APS now but i imagine without the probe it wont allow me to do anything…

MacPro 4,1 OSX 10.6.8 / FCS3 / CS5
2.26 ghz 8-core / 24GB RAM
Nvidia GT 120/285 combo

[Knut Jansohn]

Hi,

sorry but I have to say:
Gamma 2,4 is the right gamma to display rec 709 (2,35 is recommended by EBU).
There is no need to change in this case!

Regards

Knut

[Kevin Cannon]

Here’s a good thread on the lack of standards for Rec 709 gamma, whether you go with 2.4 or 2.35, or 2.2, it’s good to be able to change it: https://mobi.creativecow.net/thread/286/157#162

KC

Prehistoric Digital
PhD Grading Suite

[Knut Jansohn]

Thanks for the interesting link.

A quote from the EBU-tech3320:
“The television system has been deliberately designed with an end-to-end system gamma of about 1.2, to provide compensation for the ‘dim surround’ effect [6]. Therefore the Tech 3320 User requirements for Video Monitors in Television Productionmonitor gamma is not, and never has been, the inverse of the camera gamma.”

I guess that’s within the meaning of the creators of Rec 709.

But anyway – if your clients like to watch a display gamma 2.2, you better switch your dislay to 2.2

Regards

Knut