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Tips and Tricks Light Illusion Forums / Tips and Tricks /  
 

Focused Patch Set Profiling & Calibration

 
 
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Author Light Illusion


Male
#1 | Posted: 2 Dec 2021 17:35 
For users looking for the ultimate in calibration accuracy - gaining the last few % of accuracy - ColourSpace provides access to totally unique profiling capabilities that can focus on the Target colour space, making sure all profiling measurements are tailored towards generating the best possible 3D calibration LUT for any given target colour space.

This 'Focused Patch Set' capability uses a two-pass profiling approach, using a first profile pass to define the required colour patches for a second, focused profiling pass, and generates seriously unheard of levels of calibration accuracy!

Advanced Profiling & Calibration
(If necessary, refresh your browser cache, and click on the Advanced Profiling & Calibration option)

Any volumetric patch set can be used, including User Generated, when defining the new Focused Patch Set...

Steve

Author gorman42
ZRO
#2 | Posted: 7 Dec 2021 17:43 
Hi! I'm using ColourSpace 1.0.0.1292 with HTL license. Is this functionality available at my license level? Because the only place where I see the Active LUT functionality is in the profiling window, settings tab. And I don't understand how I could "Use the generated LUT to export a new, focused patch set, via the LUT Active option", so maybe it's something not available for my license level and I thought to ask.

Thank you.

Author Steve

INF
Male
#3 | Posted: 7 Dec 2021 17:51 
Yes - in the Characterisation menu.

Steve
Steve Shaw
Mob Boss at Light Illusion

Author gorman42
ZRO
#4 | Posted: 7 Dec 2021 17:53 
Hmmm... maybe I got it. Correct me if I am wrong and this is not the correct procedure.

Have the first LUT generated under Active LUT in the Settings tab.
Go to Characterisation tab, click on Custom Sequences/Manage. In the resulting window have the original sequence loaded, tick the Export LUT option that will display the LUT one has previously selected under Active LUT, and then click Export Sequence.

Correct? Do you think this will work with better results if used for the custom sequences that go with the LG OLEDs calibration guides?

Author Steve

INF
Male
#5 | Posted: 7 Dec 2021 17:55 
See the post on the 'Extended Range' bug...

Steve
Steve Shaw
Mob Boss at Light Illusion

Author gorman42
ZRO
#6 | Posted: 7 Dec 2021 18:00 
Steve:
See the post on the 'Extended Range' bug...

Right... once the bug is solved, is the procedure I described the correct one? And would it lead to potentially more accurate results when using the custom patch sets the guides suggest?

Author Steve

INF
Male
#7 | Posted: 7 Dec 2021 18:01 
Yep, all good.

Steve
Steve Shaw
Mob Boss at Light Illusion

Author gorman42
ZRO
#8 | Posted: 7 Dec 2021 18:03 
Steve
Thanks for confirming! I find the product you offer absolutely fascinating. I have to restrain myself or I would be spending all my time in testing all the incredible capabilities on offer. Hats off, really.

Author Steve

INF
Male
#9 | Posted: 7 Dec 2021 18:05 
Steve Shaw
Mob Boss at Light Illusion

Author mrtickleuk
ZRO
Male
#10 | Posted: 15 Feb 2022 13:33 
Thanks for this feature. I've been experimenting and followed this process:

  • Profiled with standard 4913 set from the excellent LG OLED guides
  • Created LUT (using Normalise code range, Normal range, Hybrid option)
  • Used that LUT to create a "focussed patchset" from the standard 4913
  • Added 235,235,235 white which wasn't included (total 4914 patches)
  • This contained duplicate patches: so I de-duplicated. Result = 4804 patches
  • Sorted with bobof's patch sorter to make an optimum (for LG OLED) sorted version and paired pre-roll set.
  • Profiled with new paired pre-roll and sorted 4804 patches.

The reason I used Hybrid above was that - for me - I got slightly better results overall compared with "Peak Chroma", when I was doing the normal one-pass LUT creation.

The profile I end up with, can be used to create a new LUT using "Peak Chroma" without issues. However, I can't get it to create a LUT with "Hybrid", it just hangs. I did wonder if the absence of any "grey" patches caused an issue, so I added some "grey" measurements to the Profile but it doesn't seem to have helped. So my question is, does Hybrid have any restrictions when used with a focussed patchset that I need to be aware of please?

Author Steve

INF
Male
#11 | Posted: 15 Feb 2022 16:13 
We'll need to see the initial patch set, the initial LUT, the focused patch set, and the final profile.
You can upload .zip files to the forum, or email directly.

Note: the focused patch set would NOT include a 235 patch, as it is not Extended - you used Normal Range.
100% is 255.

Steve
Steve Shaw
Mob Boss at Light Illusion

Author mrtickleuk
ZRO
Male
#12 | Posted: 15 Feb 2022 17:06 
Thanks, willdo.
I understand what you mean about why 235 wouldn't've been output, that makes sense, thanks.

Author Steve

INF
Male
#13 | Posted: 16 Feb 2022 10:09 
We'll still need to see the initial patch set, the initial LUT, the focused patch set, and the final profile, so we can test the Hybrid issue you seemed to have.
You can upload .zip files to the forum, or email me directly.

Steve
Steve Shaw
Mob Boss at Light Illusion

Author Steve

INF
Male
#14 | Posted: 16 Feb 2022 11:04 
Ah yes, Hybrid will not presently work with a 'Focused' patch set profile, due to there not being default grey patch values..
Good catch!

Actually, see later post - the issue is not the lack of grey scale patches!

Added to the Bug List.

Steve
Steve Shaw
Mob Boss at Light Illusion

Author mrtickleuk
ZRO
Male
#15 | Posted: 16 Feb 2022 12:24 
Cool, thanks!

As a work-around in the meantime, are there particular grey values that could be added to the patchset, if so which ones does Hybrid look for?

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