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

  • From: Rishi Sanyal <rishi.j.sanyal@xxxxxxxxx>
  • To: argyllcms@xxxxxxxxxxxxx
  • Date: Mon, 20 Jun 2011 12:02:00 -0700

CM software is a joke b/c it only displays the primary colors & builds
the most basic profile. Certainly doesn't allow for any 'adaptive'
mode, so the CM underestimates dark patches due to its lowered
sensitivity (being a low-end spectrophotometer, not a colorimeter),
resulting in profiles that artificially brighten darks (presumably b/c
the spectrophotometer just couldn't 'see' the darks very well due to
low exposure after running through the prism or whatever it has that
splits the light into its components).

CM software just offers no options. It's profile was completely whack
for my U2711.

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.

FWIW, my i1 Display 2 made terrible profiles when it had adjust the WB
to a set temperature; when I set it to 'native' the profile was
inaccurate, but not horrendous. I'm not sure what the implications of
this are... someone more knowledgeable should chime in.

And, yeah, I agree -- the state of affairs WRT color management is just sad.

-Rishi

On Mon, Jun 20, 2011 at 11:55 AM, adam k <aak1946@xxxxxxxxx> wrote:
> Why do you say that CM software is a joke?
> I calibrated my U2410 using displcal, Quatto software and cannot see
> much difference. I like Quatto, because it let u tune calibration
> curve for RGB.
>
> Sent from iPhone
>
> On Jun 20, 2011, at 2:48 PM, Knut Inge <knutinh@xxxxxxxxx> wrote:
>
>> I am having problems using this display and a pair of Spyder 3
>> express/Spyder 3 sensors + DispCalGui (ArgyllCMS based) + Adobe
>> Lightroom. When using the default display settings (Except seriously
>> reducing brightness) and targeting a 6500K whitepoint, I end up with a
>> lot of gain in the red channel. This puzzles me, as the Spyder 3 is
>> supposed to be quite good for Wide-Gamut displays, but riddled with
>> large sensor-to-sensor variability. Having similar (faulty?) readings
>> from 2 different sensors would be less likely, I would think.
>>
>> I have an old sRGB Dell display beside it, and using the same
>> calibration procedure it looks markedly different, and to my humble
>> eyes (using camera auto-WB or the white-point picker in Lightroom on a
>> known "white" object), actually more realistic. I am tending to
>> believe that this color stuff is just to much work and hazzle, and
>> just go with the sRGB-flow and buy newer and better gear...
>>
>> -k
>>
>> On Mon, Jun 20, 2011 at 8:18 PM, Rishi Sanyal <rishi.j.sanyal@xxxxxxxxx> 
>> wrote:
>>> What's your definition of 'good'? I had a considerable amount of
>>> nonuniformity in white balance & luminosity across the screen (up to
>>> 20%), so I had to swap out a # of times until I got a decent monitor.
>>> As for profiling, my i1 Display 2 did a horrible job, possibly because
>>> the correction matrix for that colorimeter applied to a vastly
>>> different red primary. But once I used the ColorMunki with
>>> dispcalGUI/argyll (do *not* use the ColorMunki software; it's a joke),
>>> & used the 'adaptive' mode that increases exposure for dark patches, I
>>> got a decent profile.
>>> -Rishi
>>>
>>> On Mon, Jun 20, 2011 at 7:29 AM, Matthew H. Owens
>>> <matt@xxxxxxxxxxxxxxxxxxxx> wrote:
>>>> I prefer the Eizo Nanao wide gamut displays. I have a cg241.  Take a look 
>>>> on
>>>> their website.  Many seem to accept that Eizo makes an excellent monitor 
>>>> for
>>>> working with color.
>>>>
>>>> Sent from my iPad
>>>> On Jun 20, 2011, at 7:25 AM, Marek Matulka <marek.matulka@xxxxxxxxx> wrote:
>>>>
>>>> Hi all,
>>>>
>>>> At the moment I have Dell U2410 wide gamut monitor calibrated with
>>>> ColorMunki Photo.
>>>> I am being tempted to upgrade it to U2711 - is it worth an effort?
>>>> Do you have any experience?
>>>> Is it easier to calibrate? :) assuming that I will use argyllcms suite to 
>>>> do
>>>> with ColorMunki Photo spectrometer.
>>>>
>>>> Thanks,
>>>> Marek
>>>>
>>>> --
>>>> http://marek.matulka.net/
>>>>
>>>
>>>
>>
>
>

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