RE: NEC PA271Q "Native" chromaticities
RE: NEC PA271Q "Native" chromaticities
- Subject: RE: NEC PA271Q "Native" chromaticities
- From: Roger Breton via colorsync-users <email@hidden>
- Date: Sat, 4 Jan 2020 13:08:51 -0500
> There is a "Uniformity Compensation" function and it really works.
Great!!!
> Implications here are that Uniformity Compensation (UC) mode requires use
> of a "calibrated" mode, and you are forced to disable UC if you want to do a
> custom color temp (anything other than 6500) either via a non-ICC-mode
> preset, or via custom gain/bias.
Can't have your cake and eat it too ☹
> Which leads to a theory about how it works: Panel zone variances must be
> measured at the factory and storied with the built-in cal data? (If so, it
> suggests that in principle local measurements could be uploaded into the
> device in a service mode? And that Dell's Xrite solution can maybe do this?
> Idk, but fun to think about. (In world of video, is device LUT loading
> standardized, open or proprietary?)
Seem to remember the specs on Dell's site mentioned a "SDK"? Everything may not
be lost, after all. Your theory about factory calibration at a specified CCT
makes sense.
> To give you a sense of what I'm seeing I've added some screen grabs taken
> with an iPhone, which tends to exaggerate panel / color aberrations.
> https://drive.google.com/open?id=1DSpUzIAgxsiG8qi8FKr2uJ5_P4MNmTKu
I can see some differences from left to right ☹
I don't think you'd be able to improve on this difference.
> When put in "Adobe RGB" mode, these two displays agree side-by-side as
> good as my custom cal. No trouble believing they hit < 2dE across board.
Do you mean a 2 DeltaE (whatever) in screen uniformity?
> My gestalt at this time is that a designer who hopes to just unbox, set mode
> and work appears to get what he needs.
I would tend to agree with your gestalt. Many designers would never see the
difference between the two screens or complain about the screen uniformity.
> I may—or may not—take the time to measure and evaluate the ICC presets.
It will be worth your time.
> I'm still climbing steep learning curve for these tools.
It's not for the faint of heart, I agree.
> And I'm caught because I'm not sure how much I can trust this DTP94 in my
> setup.
Florian could best reply as I'm not 100% familiar with DispCal but isn't there
some kind of 'correction matrix' to use a DTP94 on a flat panel display?
> As I play with DisplayCal the repeatability (or lack of it) keeps me
> guessing.
It's entirely possible. You have to test this hypothesis but taking repeat
measurements on the same screen area, off the same color, like RGB=128. Some
variability might come off the display as well.
> For example, I just found new instrument modes and compensation data are >
> available for download in DisplayCal since I last checked a few months ago,
> which is great! But adds to confusion. Need a more modern puck.
A modern puck would not hurt, or just, go for the gold, get an i1pro.
> For now my choice is to run these as described above, enable UC, let
> DisplayCal set whitepoint and target sRGB. This appears to get me to 95%
> Display P3 and 98% Adobe, with an sRGB TRC for default and UC enabled. It's
> a compromise that looks good.
I agree.
/ Roger
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