[argyllcms] Re: Dell U2711 - is it any good?

  • From: Rishi Sanyal <rishi.j.sanyal@xxxxxxxxx>
  • To: argyllcms@xxxxxxxxxxxxx
  • Date: Mon, 20 Jun 2011 13:36:15 -0700

I was under the impression that correction matrices are always needed
for any colorimeter due to the fact that the transmission profiles of
the filters can never accurately approximate the XYZ functions of the
human eye-brain system. This is certainly not hard at all to believe,
as the X, Y, Z spectra are complicated, not simple gaussian curves or
spikes at certain wavelengths.

Therefore a correction matrix is needed to essentially approximate the
total signal (# of photons, e.g.) a device with an excitation profile
of, say, X (in other words having a transmission profile that looks
like the excitation curve for the X function) would 'see' when given a
certain color.

Correct me if I'm mistaken.

On Mon, Jun 20, 2011 at 1:30 PM, Alan Goldhammer
<agoldhammer@xxxxxxxxxxx> wrote:
> NEC do source a colorimeter from X-Rite that has been modified with a filter
> to work on wide-gamut displays.  I've been using it with dispcal to profile
> mine and it works fine without a correction matrix file.  I have followed
> the Ethan Hansen evaluations with great interest but even he pointed out
> that these corrected colorimeters do a good job for the monitors they were
> designed for.
> Of course if you have the appropriate instrumentation you can prepare your
> own correction matrix using the tools that Graeme has developed.
> Alan
> -----Original Message-----
> From: argyllcms-bounce@xxxxxxxxxxxxx [mailto:argyllcms-bounce@xxxxxxxxxxxxx]
> On Behalf Of Rishi Sanyal
> Sent: Monday, June 20, 2011 3:59 PM
> To: argyllcms@xxxxxxxxxxxxx
> Subject: [argyllcms] Re: Dell U2711 - is it any good?
> The correction matrix is something they download into the firmware on
> the colorimeter. Try:
> http://lumita.com/site_media/work/whitepapers/files/xrite-wp-3a.pdf
> On Mon, Jun 20, 2011 at 12:15 PM, Knut Inge <knutinh@xxxxxxxxx> wrote:
>>> Knut, the Spyder 3 is a colorimeter, yes? As a colorimeter, it's not
>>> going to work well on wide-gamut displays unless the correction matrix
>>> supplied by the manufacturer is for wider-gamut displays. Even then,
>>> there's bound to be some inaccuracy. Your best bet is to use a
>>> spectrophotometer to either make the profile, or to at least make the
>>> correction matrix for YOUR monitor + colorimeter combo, then use the
>>> colorimeter with that correction matrix.

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