[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

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