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Posts by gwgill

From the measurement counts, it looks like it's never been used. [ X-Rite's driver updates this info, but note that ArgyllCMS's drivers do not. ]
One is more robust than the other when different black points are taken into account (ie. BT1886 etc.).The 50% stimulus measure gives a consistent "look", irrespective of the black level, or the actual power value needed to achieve it.At the end of the day you can end up with exactly the same result, but one is just easier to specify and transfer from one display or situation to another.
No. You seem to have it reversed.With very low ambient light and typical source material, you likely need a higher Gamma, somewhere approaching 2.4. This is because the low ambient light causes your eyes to be adapted to a lower light level, so to maintain the same shadow contrast the shadow areas need to be darker.For a brighter ambient lighting condition you likely need a lower Gamma, somewhere approaching 2.2. This is because your eyes will be adapted to a slightly...
No. Calibration and Profiling (Characterization) are different things. See http://www.argyllcms.com/doc/calvschar.html
Recent research has postulated that observers tend to clump into groups.[ see "Identification and Assignment of Colorimetric Observer Categories and Their Applications in Color and Vision Sciences" and "Toward Reducing Observer Metamerism in Industrial Applications: Colorimetric Observer Categories and Observer Classification" by Abhijit Sarkar ]Rather than attempting to re-formulate CIE 1931, the current interest seems to be more in the direction of creating parametrized...
The more wide gamut a display is, the narrower the primaries, and hence the more observer variation is likely to be noticable. Even if personalized observer curve characterization was widely available, there's no way to make two displays with different types of primary spectral characteristics match exactly for all observers. Bottom line - this is one of the fundamental disadvantages of colorimetric reproduction. Any sort of multi-primary or spectral reproduction is...
Nothing in the instrument locks it to any particular software.Some software may or may not work with a particular type of instrument, or may want certain licenses to work with a particular instrument.[ Maybe not relevant to conventional Video calibration, but note that ArgyllCMS & DispcalGUI run on a Mac, so you can use these to create 3DLut calibrations if it suites your setup. ]
Please to do not contact X-Rite with support queries for software they are not responsible for.From the ArgyllCMS main documentation page:Please note that instruments are being driven by ArgyllCMS drivers, and that any problems or queries regarding instrument operation should be directed to the Argyll's author(s) or the Argyll mailing list, and not to any other party.
You seem to be part of the repetition. So let me repeat once more: I've never claimed that Argyll is perfect - on the contrary, I'm painfully aware of its limitations and defects.But it's quite a stretch to claim that botching the first measurement is an Argyll problem when in this case it is LS that is completely controlling the measurement process that created the data file.If someone uses Argyll's dispread to take the measurements and the first reading is inconsistent...
Here we go again - a repeat of the "LS is perfect - the problem must be somewhere else" BT1886 type embarrassment.
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