Re: Calibrating & Profiling Two Displays
Re: Calibrating & Profiling Two Displays
- Subject: Re: Calibrating & Profiling Two Displays
- From: Jim Warthman <email@hidden>
- Date: Sat, 04 Jun 2005 21:36:55 -0700
- Z-usanet-msgid: XID026JFeeK70063X31
On 2005-06-04 9:13 PM, "David Burren" <email@hidden> wrote:
> 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,
That clarifies things, thanks.
In my case (10.3.9, moving to 10.4.x soon) I need to have two LCD displays
hooked up to my G5 concurrently. 10.3.9 seems (usually) to list the correct
profiles when I open the Displays preference panel. But I have no idea if my
system is applying separate LUTs (the correct ones!) to the two displays.
Maybe I can create two obviously different profiles, with different
calibrations, and see if the system will assign them "correctly".
Enjoy!
-- Jim
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