[argyllcms] Re: Display Calibration Hardware Capabilities

  • From: Rishi Sanyal <rishi.j.sanyal@xxxxxxxxx>
  • To: argyllcms@xxxxxxxxxxxxx
  • Date: Fri, 29 Apr 2011 19:21:25 -0700

I'm not so sure I believe the ColorMunki is that bad. Ethan doesn't
talk about using longer integration times via ArgyllCMS/dispcalGUI
with the ColorMunki. I have done this, & get much more accurate
shadows with my ColorMunki. Prior to using longer integration times,
my ColorMunki was *horrible*. Its profile brightened all shadows
(didn't map input 0 to output 0 like my colorimeter did). You *have*
to use the longer integration times with the ColorMunki. Perhaps this
is the reason his CM performed poorly.

Another reason his CM may have performed poorly could be because
ColorMunki software is just silly. It only measures primaries. I
didn't find its profile to be at all accurate. Which is why I switched
to using dispcalGUI. I'm happy with my profiles now, but I haven't
objectively tested how accurate the colors are (how do you do that
anyway? I don't believe you can use one hardware device to test
itself...).

I will email Ethan & ask him if he could redo the test with CM +
dispcalGUI (using longer integration times).

Also, Ethan talks about the user-unfriendliness of command-line
ArgyllCMS, but doesn't mention the very user-friendly (IMHO)
dispcalGUI.

FYI wide-gamut displays are very problematic. My Dell U2711 just
couldn't be profiled with my i1 Display 2. because it just estimated
the red primary (& perhaps the others too, but not as obviously)
completely wrong. The resulting profile completely hue-shifted &
desaturated my reds such that I just couldn't see red on my monitor. I
could literally make a color patch in Adobe Photoshop of 255,0,0 &
it'd look like a desaturated orange. The ColorMunki profile fixes
this.

Interestingly enough, when I used the CM to make a new correction
matrix for my i1 Display 2 (you can do this using ArgylllCMS, which
shows a bunch of colors to both your colorimeter & your CM or any
other spectrophotometer, separately of course, & creates a 3x3
correction matrix that helps the colorimeter more accurately assess
that monitor's primaries), my i1 Display 2 behaved quite well. Reds
came back. The profile looks pretty similar to the CM profile, not
surprisingly.

Best,
Rishi

On Fri, Apr 29, 2011 at 7:02 PM, adam k <aak1946@xxxxxxxxx> wrote:
> I'm sorry to find out about CM now after I bought it. How can I test it?
>
> Sent from iPhone
>
> On Apr 29, 2011, at 9:58 PM, edmund ronald <edmundronald@xxxxxxxxx> wrote:
>
>> I wonder whether the bad showing of ColorMunki on blacks is a one-unit 
>> failure?
>> The Spyder guys seem to have reinvested the cashflow from their
>> mediocre products into making perfectly acceptable products.
>>
>> Edmund
>>
>> On Sat, Apr 30, 2011 at 3:07 AM, Iliah Borg <ib@xxxxxxxxxxx> wrote:
>>> An updated review of the hardwares is published today by Ethan Hansen here:
>>> http://www.drycreekphoto.com/Learn/Calibration/MonitorCalibrationHardware.html
>>>
>>> It contains some interesting references to Argyll CMS too.
>>> Ethan suggested some additional explanations here
>>> http://www.luminous-landscape.com/forum/index.php?topic=53825.0
>>>
>>> --
>>> Iliah Borg
>>> ib@xxxxxxxxxxx
>>>
>>>
>>>
>>>
>>>
>>
>
>

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