Two Displays, One Graphics Card, Two Profiles, Which Profile wins?
Two Displays, One Graphics Card, Two Profiles, Which Profile wins?
- Subject: Two Displays, One Graphics Card, Two Profiles, Which Profile wins?
- From: "Andrew T. Lynch" <email@hidden>
- Date: Thu, 3 Feb 2005 11:08:38 -0800
Hi Folks,
I have an 20" Apple Cinema Display (DVI) and a 17" Apple Studio
Display (ADC) plugged into the Radeon 9600 on my G5 2.5DP. I have
profiled each of them with a Gretag Macbeth Eye-One Display (Version
1). I used a (not native) white point of 6500, a gama of 2.2 and a
luminance of 140 for both profiles.
After profiling, the two displays still look different. I have a the
same photo as a background on both displays, and the colors are
slightly different.
From the Gretag Macbeth website:
Please note, the monitor profiling process in i1Match supports two
steps: the first step is the monitor calibration, which stores an
individual gamma table in the graphic card. The second step is the
profile generation, which stores an individual ICC monitor profile as
current system profile in the control panel "Display". If you have a
dual monitor card with one graphic ship and two output signals, it is
not possible to store an individual gamma table for each monitor (both
monitors will be controlled by the same gamma table). But it is
possible to set an individual ICC profile for each monitor in the
system's control panel "Display". On dual monitor cards with one
graphic chips you need to decide, which of the two monitors should be
used for color critical work. However, we recommend to use a dual
graphic card with two graphic chips.
Is this the cause of the color difference?
Do I need to use the same profile for both displays? If not, how do I
make sure that I am using the gamma table from the profile for the
primary display (the 20" cinema display).
It does appear that for some purposes the 17" display is considered the
primary display. It is where the little spinning wheel appears when
the system is booting. I do have the menu bar on the 20" cinema
display.
As a side note, both displays are supposed to have a native white point
of 6500. The 17" was measured as 5900 and the 20" was measured at
7100.
Thanks Much,
Drew
- Andrew T. Lynch
- Chief Zymurgist
- Verisity Design Inc.
- (650)934-6875
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