[argyllcms] Re: Dell U2711 and i1Display Pro - ArgyllCMS vs i1Profiler
- From: Tom Schumm <phong@xxxxxxxxx>
- To: argyllcms@xxxxxxxxxxxxx
- Date: Sat, 24 Nov 2012 09:47:48 -0500
On Thursday, November 22, 2012 09:21:57 PM Tom Schumm wrote:
> I'm trying to get my new monitor properly profiled and I'm having some
> trouble...
>
> I got a i1Display Pro and tried using the X-Rite i1Profiler software. I also
> tried using ArgyllCMS via DispcalGUI. The profiles they produce are
> noticeably different. I would expect some small variation, but the
> difference is pretty big. At least one of them has to be quite wrong. Most
> of the difference seems to be in the reds.
I can add some additional information. After playing around with it for a
while, I'm sure the Argyll profile is the one that is wrong - it has very high
Delta E for some colors, and subjectively looks quite wrong (reds are really
really orange, not a little bit orange).
I tried playing around with varous settings, and was able to make small
improvments (e.g. I got rid of the strong color cast in grays by using Matrix
+ a single curve instead of 3xCurve) but the delta E remained high, and the
handling of red colors remained really far off.
Finally I tried generating an XYZ LUT profile instead, and somehow that
produced a radically better result. The primaries are located in entirely
different places (closer to where I would expect them to be) and the overall
appearance is quite similar to the i1Profiler generated profile.
However, I was using Matrix+Curves profiles because all the documentation says
that LUT profiles are less smooth and have compatibility issues. In fact, I
notice a lot of banding in Adobe Camera Raw and Photoshop.
I know Matrix profiles are less accurrate, but are they supposed to be that
far off? I'm talking delta Es of like 8 or more vs. the 0.4/1.4 average/max
for the LUT profile.
I tried with the display in both "Standard" mode and "Custom" mode. Both
generated equally accurate LUT profiles, but neither got close with Matrix.
--
Tom Schumm
http://www.fortmyersgo.org/
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