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General questions regarding ColourSpace and general calibration

 
Author zmas
ZRO
Male
#1 | Posted: 19 Oct 2022 17:16 
I' ve been using ColourSpace for a couple of months now and I have some questions about it's functionality so I'd thought I'd ask them here in the forum instead of sending a support email;

I bought a i1 Display Pro and been using that probe too which leads me to my first question:

Drift - Does the drift chart show the drift on the display only or is it also influenced by the heating of the probe? In the case of the i1 probe, how does heat at affect the measurements? Does the probe heat up from the display heating up or does it also heat "internally" from taking measurements. In that sense, is doing a pre roll before a large profile measurement enough or just I run a "dummy" profile to heat up the probe as well as the display? I'm asking because the drift chart on my last profile of an LG woled shows quite a bit of drift.

21^3 profile vs greyscale rgbcmy profile - I've just performed a 21^3 profile on my LG C2 television and was slightly disappointed in the greyscale result, as a test I ran a quick greyscale +rgbcmy profile and the resulting calibration was much more accurate on the greyscale. I checked both calibrations with a 1000 point profile and obviously the 21^3 profile achieved better volumetric results (surprisingly not that much superior though) but slightly worse greyscale results. I was wondering what the issue might be here, I tried different LUT generation methods but the results were the same. I can share the before/after profiles of each calibration if needed.

In the case of WOLEDs; I decided to lift the black point on my c2 unit slightly (setting set at 58 - measured at 0,0042 nits by the i1 display pro) how does does affect the longevity of t he panel? Does it help or worsen the changes of burnin in the long run?

Frame insertion - also pertaining to woleds, does using FW frame insertion to prevent burn in from using an L20 patch size have an effect on the measurements due to panel stability?

Author Steve

INF
Male
#2 | Posted: 20 Oct 2022 11:35 
For obvious reasons, Drift is always a combination of all devices in the signal chain, so could be the display or probe.
In reality, probe drift is usually negligible, unless the probe is in direct contact (no hood, as with CR, Klein, etc.) and you have a display that heats-up hugely during profiling, as so heats the probe too.
But, any display that heats-up that much will be the bigger issue with Drift...

If the probe is heating up, then doing a dummy profile, before the real profile, may help.

But, displays using WOLED glass are very unstable, so seeing bad Drift is not at all unusual.

Due to the issues with display instability, it becomes impossible to know if the result of a Cube based calibration vs. a Grey Ramp is actually better/worse, as Drift will also effect the Verification profiling...

But, under all 'normal' circumstances, Cube based calibration will always be better...

Lifting black will have no noticeable effect on screen longevity.
It 'could', in theory, improve longevity, based on less pixel on/off transitions...

And yes, FW bright frame insertion could also affect Drift, for obvious reasons.

Steve
Steve Shaw
Mob Boss at Light Illusion

Author zmas
ZRO
Male
#3 | Posted: 20 Oct 2022 11:55 
Thanks for your reply Steve.

Regarding frame insertion on WOLEDS, is it better to use a darker color instead of a bright one to help with the heat drift?

Author Steve

INF
Male
#4 | Posted: 20 Oct 2022 13:25 
A darker patch will not prevent the possibility of burn-in in the same way...
The choice is yours.

Steve
Steve Shaw
Mob Boss at Light Illusion

Author zmas
ZRO
Male
#5 | Posted: 23 Oct 2022 08:07 
Got it. Thanks.

Regarding the LUT generation option, in the case is WOLED's is there a method that works best?

The last LUT I generated I used the hybrid method to see if I could have improvements in the greyscale tracking, but found no discernible difference betweeen that method and Peak Chroma.

Author Steve

INF
Male
#6 | Posted: 23 Oct 2022 08:10 
There is no 'best' option for any given calibration. The choices are there so you can try them all, and define the one that works for you.

A Focused Patch Set may also be worth trying.

Steve
Steve Shaw
Mob Boss at Light Illusion

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 General questions regarding ColourSpace and general calibration

 

 
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