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Display Calibration Light Illusion Forums / Display Calibration /

Resolve / i1DPro / Z27x first calibration

Author PeteW
Mono
#1 | Posted: 16 Jun 2019 17:02 | Edited by: PeteW 
Hi,
I'm trying out Lightspace and hoping for better results after using Displaycal for several years.
I have an HP Dreamcolor Z27x connected via BM Mini Monitor 4k HDMI to my Davinci Resolve system, with an i1 Display Pro Rev B Retail probe.

So far I have profiled the uncalibrated monitor in it's "Native" state, and tried to create a LUT get me to a standardised Rec709 G2.4 working space.

I used the "Quick Profile" Primary/Secondary setting with probe set to "AIO" and "Generic CMF", all else default settings.
From looking at the results it seems the LUT has done a decent job, but for some reason there is a major outlier in deltae at the bottom end.
Is this something which is down to a user error? Or do I need to run a more in depth display characterisation and 17x LUT for better results? Or is it simply a limitation of my monitor that can't be resolved through calibration?

Any advice gratefully received.


Pre and Post calibration reports:

http://www.petewallington.co.uk/calibrationresults

Author PeteW
Mono
#2 | Posted: 16 Jun 2019 18:03 | Edited by: PeteW 
I generated a comparable quick 145patch LUT in Displaycal and verified in the same way in Lightspace, and the results of the Displaycal calibration seem to be considerably better? Certainly looking at the Delta E graph.

Report at URL above

Author Steve
Scene
#3 | Posted: 18 Jun 2019 20:06 
Sorry - missed this.
The LightSpace Pre-Cal shows a really bad RGB Separation error in black.
No idea why, but something is not right.
But, a 0.1134 nits black level is very high, and suggests something is not right with the displays setup, or the image patch being used.

I'd start by looking into why the black is so high, and why there is that strange RGB Separation error.

Steve

Author PeteW
Mono
#4 | Posted: 18 Jun 2019 21:46 
Hi Steve,
Many thanks for the response.
My understanding was that the 0.1 black level is about right for the z27x, which is an IPS monitor?
If that's not the case, what sort of min black level should I be expecting?

TIA

Author Steve
Scene
#5 | Posted: 18 Jun 2019 21:52 
You should be getting 0.0x for any decent IPS screen.

Steve

Author PeteW
Mono
#6 | Posted: 21 Jun 2019 15:00 
From what I can find trawling around the internet for other users with the same monitor, it does seem that unfortunately 0.1134nits for min black is pretty standard for the Z27x.
I can actually get it down to 0.056, but it means reducing the peak white to only 48cd/m2.
As a compromise I've set it to 80cd/m2 peak white, which gives black level around 0.09.
Profiling the monitor the results look almost identical to those previously, there is still a big deltaE and RGB seperation error in black. Presumably this is the IPS glow inherent in the monitor and nothing can be done about it?

Author Steve
Scene
#7 | Posted: 22 Jul 2019 11:42 
Sorry Peter - I totally missed getting back to you.
One question - why is the LightSpace LUT causing clipping?
That is not at all normal.
Can you send me the profile and the LUT you generated from it, as well as the Verification profile.
Something is wrong somewhere - I think it it may be a TV Legal vs. Data issue?

Steve

Author PeteW
Mono
#8 | Posted: 9 Aug 2019 12:20 
Thanks Steve,
My trial subscription has lapsed so I can't regenerate these. Where would I find the profile and verification profile, are they stored in a standard location on a PC?

Author Steve
Scene
#9 | Posted: 9 Aug 2019 14:02 
The profiles are held in:
C:\Users\XXX\AppData\Roaming\Light Illusion\ColorSpaces

Steve

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