[argyllcms] Re: Awful result with Argyll 1.3.5 + dispcalGUI 0.8 + i1Display Pro & Dell U2711 :-(((
- From: adam k <aak1946@xxxxxxxxx>
- To: "argyllcms@xxxxxxxxxxxxx" <argyllcms@xxxxxxxxxxxxx>
- Date: Mon, 9 Jan 2012 18:06:43 -0500
Hello,
Does Colormunki with Xrite software create a LUT profile?
A Kielcz
On Jan 9, 2012, at 5:38 AM, Fabrizio Giudici
<Fabrizio.Giudici@xxxxxxxxxxxx> wrote:
> Following Pictus' advice, I've run more visual tests, this time with a
> reference chart. I've found these suggestions at Luminous Landscape:
>
>
> http://www.luminous-landscape.com/essays/test-charts.shtml
>
>
> The Granger chart looks interesting, even though if I understand well it's a
> sort of "over-stressing" the performance, since it also contains imaginary
> colors (see below).
>
> Since I only have Photoshop Elements, that can't create from scratch 16bpc
> images and lacks some tools, I've found this pre-made Granger chart in TIFF:
>
> http://www.cameratrax.com/Color/color.php?BodyName=color_granger.txt
> http://www.cameratrax.com/Images/CT-Granger_4x6_300ppi.tif
>
>
> The comparison has been very interesting. I've compared the i1Profiler LUT
> profile and 4 Argyll profiles from the same data created with these options:
>
> $ARGYLL_BIN/colprof -v -qu -ni -no -ag -O "$BASE_NAME gm.icc" "$BASE_NAME"
> $ARGYLL_BIN/colprof -v -qu -ni -no -as -O "$BASE_NAME sm.icc" "$BASE_NAME"
> $ARGYLL_BIN/colprof -v -qu -ni -no -al -O "$BASE_NAME cLUTlab.icc"
> "$BASE_NAME"
> $ARGYLL_BIN/colprof -v -qu -ni -no -ax -O "$BASE_NAME cLUTxyz.icc"
> "$BASE_NAME"
>
>
> The Granger chart has been opened by Lightroom 3.5.
>
>
> Argyll SM: Some parts in the transition between blue and green gets violet,
> with an internal area that abruptly loses the violet cast but is darker.
> Moderate banding in the lower third.
> Severe banding in the dark area. Some problems in the lower fourth between
> greens and yellows (the yellow are seem to extend too much into green).
>
> Argyll GM: same as above, plus the bottom part is not as dark as SM. The
> problematic area between greens and yellows is better.
>
> Argyll XYZ: Same as SM, more banding in red/violet lower third. The
> problematic area between blue and green has still the violet cast, but at
> least without the darker area inside. The problematic area between greens and
> yellows gets slightly violet.
>
> Argyll LAB: Same as XYZ, but no extra banding in red/violet lower third. The
> problematic area between blue and green has still the violet cast, but it's
> lighter and overall it looks better. Also no strong problems in the
> green-yellow area.
>
> i1Profiler (LUT). There's a bit more banding in the lower fourth, but all the
> problematic areas look better (the violet cast in the blue-green area is the
> least of the comparison).
>
>
> Remember that I have a monitor which has only 6 true bits per color, so some
> banding is due to the hardware. Of course, in areas where there's at least
> one profile that doesn't cause banding the monitor is not the guilty one.
>
>
> All in all, the better profiles are the i1Profiler (the one I currently use)
> and Argyll LAB.
>
>
> At first sight, anyway, the tests with the Granger chart are depressing
> especially for that problematic area between blues and greens. But since - if
> I understand well - the chart is generated in the ProPhoto RGB space, and
> this space has some "imaginary" blues, I presume it's normal. I've searched
> for a further explanation on Granger charts, but I've found nothing (there's
> a previous discussion with Argyll and Granger here, but no big information:
>
>
> http://comments.gmane.org/gmane.comp.graphics.argyllcms/5720
>
>
> I tried to take screenshots of all the tests, but the results are
> meaningless. I'll try later to take photos at the screen.
>
> Note that during these tests I was severely annoyed by the Mac OS X System
> Preference panel used to change profiles:
>
> 1. In spite of Apple's reputation for UI, the window with the profile name is
> narrow and can't be enlarged - it seems that at Apple they don't understand
> that serious people usually use very long names for profiles.
> 2. Focusing on the System Preference panel for changing a profile makes
> temporarily disappear the full screen Lightroom loupe.
> 3. The System Preference panel seems to be buggy, since after a number of
> switches it also screwed up the profile setting of the MacBook... I've seen
> the bug other times (for safety I usually reboot at this point), I'll try to
> re-run the test with a script that changes profile by means of the Argyll
> tools.
>
>
>
> --
> Fabrizio Giudici - Java Architect, Project Manager
> Tidalwave s.a.s. - "We make Java work. Everywhere."
> fabrizio.giudici@xxxxxxxxxxxx
> http://tidalwave.it - http://fabriziogiudici.it
>
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