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109% Extended Range

 
Author Steve

INF
Male
#1 | Posted: 1 Apr 2021 09:22 | Edited by: Steve 
As some have seen, in the most recent build of ColourSpace we have made changes to the way 109% Extended Range works.
This has been planned for some time, and is also a precursor changes for PQ HDR calibration.

The changes in the present ColourSpace build should not really have been released as yet...
But, they have been, and the next release will finalise the changes for 109% Extended.

The information provided in the Patch Scale & Resolution page has been update to include information on these changes, including specific information on the requirement for the 'white patch'.
If this information is not followed correctly, especially with User Preset Patch Lists, the resulting profile, and any LUT generated from it, will be incorrect.

Critically, users must be aware of 109% using 235 (8 bit) as the white patch, with the addition of over-range patch data up to, and including, a 255 patch.
If a user patch set lacks a 235 and/or 255 patch (8 bit), depending on the Patch Scale range being used, synthetic data taken from the 'Target Max' value in the Settings page will be added to the profile.


Steve
Steve Shaw
Mob Boss at Light Illusion

Author liberator72
ZRO
Male
#2 | Posted: 1 Apr 2021 11:50 | Edited by: liberator72 
Hi Steve,

Clarification, if I may...

As you are aware, LG OLED requires 16-255 Extended for Characterisation, so I just want to be sure I understand correctly in case I need to modify the guides and/or custom patch sequences in any way.

When using a custom generated CSV sequence with Patch Scale Extended, the sequence must contain both 100% (235) and 109% (255).

Or is it the case that provided the sequence contains 109% (255) that is all it will need as the Max White value will be correctly recorded?

The above obviously assumes the sequence contains the correct 0% black (16) within the sequence in either case.

Cheers, Leon

Author Steve

INF
Male
#3 | Posted: 1 Apr 2021 11:53 
No, as stated in the Patch Scale & Resolution guide, an Extended Patch Set must have both 235 and 255, as well as 16 (8 bit).
"0 and 255 for Full; 16 - 235 for Legal; 16 - 235 & 255 for Extended ( 8 bit)"

Steve
Steve Shaw
Mob Boss at Light Illusion

Author liberator72
ZRO
Male
#4 | Posted: 1 Apr 2021 11:57 
Cool, that's how I understood the wording in the linked page, I just wanted to clarify due to the wording in the first post (and/or).

All good, just need to check that the sequences we provide contain both 235.235.235 and 255.255.255 patches then, other than that, nothing else changes for us.

Thanks, Leon

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