[argyllcms] Re: Quato DTP94 vs i1 Display Pro for Dell U2711

  • From: Tom Schumm <phong@xxxxxxxxx>
  • To: argyllcms@xxxxxxxxxxxxx
  • Date: Thu, 29 Nov 2012 17:14:21 -0500

On Thu, November 29, 2012 11:24:09 AM Sebastian Schubert wrote:
> Hi,
> I use a Dell U2711, and so far the DTP94 in the Quato bundle with iColor
> Display 3 and its generic wide gamut correction in the software. Is the
> i1 Display Pro superior? In particular, do I understand it correctly
> that the wide gamut correction is included in the device, so that I can
> use ArgyllCMS without the need of a correction? For first results I
> might also consider using the supplied software under Windows. How about
> that?
> Thank you for any advice,
> Sebastian

I have a U2711 and an i1Display Pro. I can't speak to how it compares to other 
devices, but it seems to do the job, more or less.

The i1Profiler software comes with a spectral correction file, but it's a 
generic file for all wide-gamut CCFL displays. It seems to give similar, but 
not identical results from i1Profiler and ArgyllCMS. There's also a correction 
file available from the colorimeter corrections database for this 
display/colorimeter combination:


It seems to work too, although it gives different results than the specrtal 
file that comes with the colorimeter. I have no way of knowing which is 
better; I do not have access to a spectrometer. The difference in terms of the 
resulting profiles does not appear to be huge, however.

I was not able to get a satisfactory matrix profile in either ArgyllCMS or the 
i1Profiler software. They're both about equally inaccurate, but in different 
directions. It seems that the display simply does not behave in a way that is 
modeled well by matrix profiles.

LUT profiles from either piece of software seem to be pretty good. The 
ArgyllCMS profile has artifacts when displaying an image with a ProphotoRGB 
color space, and I haven't figured out exactly why yet.

The display seems to calibrate and profile well in the Standard or Custom 
presets, at least my revision. There had been some suggestion that the Dell 
Ultrasharps either clipped the gamut or had other problems in anything other 
than Standard mode. This is either not true with the U2711, or it's not true 
on the later revisions (mine is A09). My best result was in Custom mode, using 
the RGB controls to get the white balance as correct as possible. The 
resulting gamut and deltaE results seemed about the same, and the grayscale 
ramp was subjectively more consistently neutral looking.

Tom Schumm

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