[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:
http://dispcalgui.hoech.net/colorimetercorrections/
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
http://www.fortmyersgo.org/
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