[argyllcms] Re: Can anyone help with a weird OSX problem?

  • From: "Derek Wells" <sigma3@xxxxxxxxxxxxx>
  • To: <argyllcms@xxxxxxxxxxxxx>
  • Date: Tue, 8 Jul 2014 12:23:11 +0100


If I remember correctly, there were a number of parallel problems with
10.6-ish and blue / purple tinted screens

One was that fast user switching didn't handle the screen correctly
going from one user to another ... giving blue/magenta tinted screens:
Fix for that one was to disable fast user switching.

Some versions of 10.6 handled V4 profiles incorrectly. Not a problem
with Argyll, which produces V2 profiles, but you might want to check
that your other software is producing V2 profiles, not V4.

Another problem was that the MBPs of that generation had screen
backlights with primaries that were some distance from the sRGB
primaries ... especially the blue primary which was quite "purple". This
caused some smaller (matrix / shaper?) profiles to map saturated blues
to more purple tints on the screen. Note that the profile itself is
correct, within the constraints of the screen's performance.
A general fix was to go to larger patch counts and produce a larger,
look up table based, profile.

I hope this helps.


-----Original Message-----
From: argyllcms-bounce@xxxxxxxxxxxxx
[mailto:argyllcms-bounce@xxxxxxxxxxxxx] On Behalf Of Quartz
Sent: 08 July 2014 10:51
To: argyllcms@xxxxxxxxxxxxx
Subject: [argyllcms] Can anyone help with a weird OSX problem?

First off, let me apologize in advance: this list is probably not the
best place to ask this question, but it's the only place I can find a
collection of people who know what they're talking about wrt ICC stuff,
and I'm kind of at my wits end.

I have in front of me a 2007-era MacBook Pro running OSX 10.6.8 (Snow
Leopard), and a Gretagmacbeth EyeOne Display2. I cannot for the life of
me get correct colors out of this combination. I've tried both versions
of Xrite's 'EyeOne Match' software as well as dispcal+argyll, and I
always get this weird issue with select blues appearing noticeably
purple, but in a weird mix-and-match fashion depending on what I'm
doing. I don't think it's a bad sensor- Xrite's utility says the i1d2 is
fine, there's no uniform or linear color cast, and everything works fine
on an older PPC tower running OSX 10.5. Neither is it generic to all
profiles on this laptop- if I 'eyeball' a profile using Apple's utility
or SuperCal I don't have this problem.

I've been hunting for info for days... there was a flurry of people
reporting this issue back in '09 when 10.6 came out, but the net seems
to have gone silent since then, and I'm not seeing that there was any
sort of a general solution.

Can anyone here point me to a place where I might be able to get help
for this?

it has a certain smooth-brained appeal

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