[argyllcms] Re: Displays with internal gamut emulation

  • From: Graeme Gill <graeme@xxxxxxxxxxxxx>
  • To: argyllcms@xxxxxxxxxxxxx
  • Date: Thu, 19 Aug 2010 00:51:09 +1000

János wrote:

 In the graphs you show, what is the horizontal axis - time ?



No, that is the luminance. :)


Oh, OK, it was rather unclear. So you are saying that
the emulation doesn't emulate an additive device.


I measured every steps on red, green, blue and white gradients [0..255]. The
gamut emulation is not perfect on the near-black shades, and this will
produce colorized grays after the VGA LUT calibration.


If you are using only calibration, yes. If you profile with a cLUT based
profile and use color management, this shouldn't be such an issue though.


You can't notice the slightly over saturated colors on dark shades but the
software will miss the white balance because it assumes stable primary color
saturations (I think).


An Argyll display calibration should result in a neutral ramp even in
this case, since that is what it is striving for.


It was a poetical question, if somebody may know how to do it... Dell
doesn't offer any automated calibration softwares (like the EIZO
ColorNavigator)  or service tools (to readjust the strange factory
settings).


Sounds unlikely. It would probably have to be reverse engineered,
and there's nothing I can do about that since I don't posses such
a display.


Yes, I only read about the fix and I assumed you corrected the problems.
I still have some "Misread, Retrying..." messages.
Will it affect the calibration precision? Are the current measures correct
after the software gets over this hangups?


The readings aren't as accurate as they should be in adaptive mode, because
in some cases the integration is calculated incorrectly. I'm hoping to
get V1.2.2 out shortly though.

Graeme Gill.

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