[argyllcms] Re: Colormunki Photo & Dell up2414q led back-lit

  • From: Graeme Gill <graeme@xxxxxxxxxxxxx>
  • To: argyllcms@xxxxxxxxxxxxx
  • Date: Fri, 06 Mar 2015 00:02:11 +1100

Mathieu GRENET wrote:
> yes, it has wide gamut, here is the file for white patch, calibration loaded.

        well it's always possible that the ColorMunki has inadequate accuracy
for the given type of display (for instance, wavelength calibration accuracy),
but given the nature of the display primaries, it's also possible that your
are feeling the pain of being at the bleeding edge of wide gamut.

The green primary in particular is extreme, and is close to the point
of maximum variability of observers medium and long wavelength cones.
The red is rather way out there too, and although it's broader than
the blue and green primaries, it's out in a region where the long
wavelength cones are dropping off in sensitivity, and have high
variabilityamongst observers.

So in summary you may be experiencing observer induced metameric failure.
The instrument is measuring color as the standard observer sees it,
and you aren't a standard observer (very few people are exactly
on the average).

The most pragmatic "fix" is to manually drag the white point
aim chromaticity to location that looks like a match to you
to the other screens, and then calibrate & profile as usual.
(This is the type of thing that Sony is doing with their
 wide gamut monitors to counteract similar issues.)

The theoretical fix is to measure your particular CMF's, and
then use them, rather than the standard observer. A practical
way of doing this has yet to be manufactured.

Graeme Gill.

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