Question about meter correction and change wb on existing 3d lut

[patrik10 SourceForge]

Hi
i have just got my i1d3 meter profiled against a Jeti spectrometer
the problem is that these corrections are build in in the new licence file i got for chroma pure.

i know what x and y corrections being set for white ballance and colors
is there a way to manually put the x and y corrections into dispcal?

i also wonder since white ballance now was slight changed with the corrected meter
i have recalibrated the white ballance on the tv.
will the existing 3d LUT that i use change its colors with this NEW whiteballance?
that is if the 3d lut corrections follows the new set whites ?
or must i make a new 3d lut profiling ?

corrections being made
http://privat.bahnhof.se/wb192876/ProMeterReport.pdf
its only the plasma section i will use for now

• This topic was modified on 2016-01-14 13:42:21 by patrik10.

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[Florian Höch]

i know what x and y corrections being set for white ballance and colors
is there a way to manually put the x and y corrections into dispcal?

If you convert to XYZ you can use one of the existing CCMX as template and just insert the values. If you need help doing this, let me know.

[patrik10 SourceForge]

thanks but its only those X and Ys listed in the pdf that is corrected.
its at 100% saturation for primary and secondary colors only.
and also for white.

is that enough to put in?
it would be great if you can explain it.

the old 3d lut works and looks ok with the new whiteballance.
but colors are still off

[patrik10 SourceForge]

i mean i have changed the WB on the tv to hit the new target for the corrected meter.
the old 3D LUT uses the same new wb and doesnt change it which is great.

wb doesnt seem to be locked with the 3d LUT right?
you can change it manually and the 3D LUT uses it

• This reply was modified on 2016-01-21 00:37:59 by patrik10.

[Florian Höch]

thanks but its only those X and Ys listed in the pdf that is corrected.
its at 100% saturation for primary and secondary colors only.
and also for white.
is that enough to put in?

It’s a little involved deriving XYZ from just x y values, so I’ve created the matrix for you. You just need to drop it into dispcalGUI.

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[Florian Höch]

wb doesnt seem to be locked with the 3d LUT right?
you can change it manually and the 3D LUT uses it

Typically any changes to the display settings require re-doing the profile and 3D LUT for best accuracy.

[patrik10 SourceForge]

thanks!
i will try it out.

i also have a suggestion
when you are done profiling and get to the selfcheck window can you add % of gamut coverage for DCI P3 also?
i know its close to adobe rgb but as many tv reviewers measure todays tvs against P3 it would be great.

• This reply was modified on 2016-01-23 15:04:49 by patrik10.

[patrik10 SourceForge]

the correction file works 🙂
it only shows an dE of 1.4 for the whiteballance with the calibration.
dE 6.2 without the correction file so quite a huge difference and mostly a visible one.
that is with the new set whiteballance on the tv with chroma pure and correction added to the meter.

in chroma pure with the correction added wb has dE 0.4
small differences but this is close to perfect.

so time for another 3100 pacthes profiling today
thanks again

• This reply was modified on 2016-01-23 15:58:42 by patrik10.

[patrik10 SourceForge]

Btw are you going to upload this correction file to the database ?
I think it will be usefull for others.

As for Plasma the readings Tom Huffman did was on a 9G Kuro specific.
I have a KRP 500M and the corrections i got from my tv was spot on with the corrections he did on the other Kuro.
So i think its safe to say that this file will be most correct on Pioneer 9G/9.5G Kuros

[Florian Höch]

Btw are you going to upload this correction file to the database ?
I think it will be usefull for others.

I don’t think I can. All corrections uploaded to the database need to be in the public domain (or made available as such), and the licensing of the original measurement data is unclear to me.

[patrik10 SourceForge]

ok no problem
just have to report that this new meter correction and the new 3D LUT after 3100 patches is amazing!
colors/gamma/grayscale/blacklevel a are spot on.

its great to see that the new versions of dispcal fixes the issues i had with gamma tracking before.
now we are talking a totally flat gamma curve from 5% to 100%
i never got it with the eariler versions last year.
it was allways bumps and dips with the gamma curve before

picture is so amazing now!
posterization/water paint looking hairs and skins in low apl scenes that the KRP-500Ms have standard is gone with the 3D lut.
its clear that the 3D LUT fixes color and grayscale grades/steps near black that you dont get with a standard calibration

just one off topic question
i know another 500M user that still thinks Lumagens is the way to go for 3D LUTs
but i have explaind that dispcal/argyll cms/madvr combo beats them.
and we are not talking prices for the Lumagens here 🙂

thats right that this combo with argyll cms can use much bigger 3d luts that any of the Lumagens offer right?
even the eecolor lut box is behind or am i wrong?

im still amazed that this program is free lol

• This reply was modified on 2016-01-26 20:25:06 by patrik10.

[Florian Höch]

thats right that this combo with argyll cms can use much bigger 3d luts that any of the Lumagens offer right?

The nice thing about a LUT box is that you can run sources other than a HTPC through them. As far as I know, support for Lumagen devices may come in a future version of Argyll. Currently, only eeColor and Prisma LUT boxes are supported.

even the eecolor lut box is behind or am i wrong?

In regards to LUT size, it’s on par with madVR (65^3, effectively 64^3 in case of the eecColor).

im still amazed that this program is free lol

Financial contributions are always welcome to either project -)

[Peter V.]

Hi Florian,

I tried to replicate the correction matrix you supplied for the plasma screen from patrik10 and also came up with an alternative correction matrix.  Is it possible that your correction matrix focuses on the white point calibration (with RGB relatively speaking off-see blue marked correction matrix and calculated post calibration table) where as my correction seems to focus on RGB (with white relatively speaking off, see orange marked correction matrix and calculated post calibration table)?

Which more correct, practical or benefical? Is something wrong with my calculation?

I used  for Y=100% white , R=21,26%, G=71,52%, B=7,22%

I converted xyY to XYZ with formula from Bruce Lindbloom.

In attachement the calculation file (Excel)

Greets P.

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[Florian Höch]

Which more correct, practical or benefical?

It’s better to focus on getting the whitepoint right as the human visual system is much less prone to notice errors in highly saturated colors, but much more sensitive to errors in neutrals.

[Author]

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