Matrix profiles – best charts and verification

[Euri Pinhollow]

I found out that matrix profiles are fine for my application and use the instead of LUT profiles for faster refreshing.

I came to conclusion that it is most effective to make a testchart from:
– 256 neutral patches
– several white patches to correct white point drift
– several iterative patches
– several single-channel patches

This should be fine as long as subpixels of LCD are not influencing adjacent subpixels.

I have done profiling and verification (with no simulation) and results are fine – except that the maximum error is detected on (198,198,198) (delta=3) and (0,0,255) (delta=4) both of which are obviously included in profiling chart.

What can go wrong? Why can there be so big error on samples included in chart?

• This topic was modified 7 years, 10 months ago by Euri Pinhollow.
• This topic was modified 7 years, 10 months ago by Euri Pinhollow.

[Euri Pinhollow]

I have redone profiling several times, results are almost the same – mostly fine with with spikes ay blue and gray patches.

Does it mean that there is indeed a non-linearity in LCDs which cannot be expressed with curves and matrix? Does it mean that I should use LUT?

• This reply was modified 7 years, 10 months ago by Euri Pinhollow.

[Florian Höch]

Does it mean that there is indeed a non-linearity in LCDs which cannot be expressed with curves and matrix? Does it mean that I should use LUT?

Possibly, this depends on the particular display.

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