Official Panasonic VT60/VT65 Series Discussion Thread [No Street Price Talk] - Page 535 - AVS | Home Theater Discussions And Reviews
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post #16021 of 16022 Old Yesterday, 03:46 AM
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Originally Posted by fluxo View Post
He writes "A reference white of D50 (ICC default) and complete chromatic adaption of the viewer to the display's whitepoint is assumed if “simulate whitepoint relative to target profile whitepoint” is used, so the measured XYZ values are adapted to D50 [...]".

Do you think he wants to provide values that correctly describe the report patches as shown on a computer display?
My reading of it was that D50 is being used because that's standard for ICC profiles. But you should pose your questions directly to Florian on his DCG forum here.

Initially, I wanted to know how the 493 sample patches were chosen.
The verification patches consist of the typical neutral and color axis luminance ramps plus a number of randomly distributed patches [not aligned with the profiling patches] to test the robustness of the calibration. The number of random patches you use is somewhat arbitrary but users have found that several hundred up to 1000 have been sufficient to get repeatable assessments across a variety of displays.
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Originally Posted by zoyd View Post
My reading of it was that D50 is being used because that's standard for ICC profiles. But you should pose your questions directly to Florian on his DCG forum here.
If I get a chance, I will do that, thanks. Or perhaps sillysally would take the opportunity to ask why the D65 reference white point is wrong, as he uses the program?

I've been doing some further coding today, as a result of which I have generated a table that can be glimpsed at in this post. During the course of that exercise I decided to check the CIEDE2000 errors as listed in the report table. The good news is that the values I have checked (a small sample) look fine, with only a hint of the occasional possible rounding error.

I was starting to worry that that would not be the case, because if oddities existed elsewhere then who could say what would happen during the calculation of the hideously complicated error function? Fortunately, any fears appear to have been unfounded.
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