Re: Calibrating & Profiling Two Displays
Re: Calibrating & Profiling Two Displays
- Subject: Re: Calibrating & Profiling Two Displays
- From: David Burren <email@hidden>
- Date: Sun, 5 Jun 2005 14:13:37 +1000
On 05/06/2005, at 12:34 AM, Jim Warthman wrote:
On 2005-06-03 7:25 AM, "David Burren" <email@hidden> wrote:
I just upgraded a week ago (waited for 10.4.1), and the first thing I
noticed was that when an external display is connected, Tiger not
only remembers the right profile (Panther managed this) but also
loads the associated LUT. In Panther you had to select Display
Preferences and switch to a different profile and then back again,
which rather spoiled the whole thing.
How do you determine that Tiger applies the proper profile and LUT?
What
would you do to verify this?
Also, the process you describe for Panther, you don't say if that
sets the
correct profile AND the correct LUT.
Checking that it gets the right profile is simple. Take two
different external monitors, "A" and "B".
Plug A in, generate "Profile A1". Plug B in, generate "Profile B1".
Plug A back in, and check the Display Preferences. The system should
will have "Profile A1" associated with it. This worked for me in
10.3 and in 10.4. Plug B back in and you'll find "Profile B1"
associated with it.
However, on Panther the colours were visibly "off". Greys on my Sony
LCD (call it "A"/"Profile A1") were pinkish. But if I went to
Display Preferences, selected a different profile (which reloaded the
LUT) and then reselected Profile A1 (which reloaded the correct LUT
values) everything was fine again. So Panther wasn't loading the
LUTs correctly on display auto-detection. I never quite worked out
where the actual LUT values were coming from, but I suspect they were
just hanging around from the previous display.
On Tiger the LUT is being auto-loaded. My greys are grey. In fact I
made up screwy profiles A2 and B2 which were essentially copies of A1
and B1 but with the red and green vcgt entries dramatically warped in
different ways. After telling the system to use A2 and B2 for each
display, it's easy to see that the matching LUT values are being used.
__
David Burren
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