PM5 Issues & Bad Display Profiles
PM5 Issues & Bad Display Profiles
- Subject: PM5 Issues & Bad Display Profiles
- From: DS <email@hidden>
- Date: Sun, 4 Sep 2005 20:33:45 -0700 (PDT)
I'm attempting to profile the LCD of my PowerBook
(auto brighntness adjustment is off) with ProfileMaker
5.0.4 and an EyeOne, and I'm running into several
difficulties with the application and the profiles
it's generating.
APPLICATION ISSUES
When I start the process, PM asks if I want to do a
calibration first, and I select yes. In the screen
that appears, I can select several settings: white
point, gama, brightness, and monitor type. I have no
idea what this brightness setting is (a list from 25%
too 100% in 5% increments), and there's no description
of it in the documentation. I assume I should use 100%
and continue along my way. What is this and what does
it control? Should I use 100%? When would one *not*
want to use 100%?
In the next step, PM tells me to set the contrast to
it's highest setting and then lower it until the
arrows line up. My PBook has only a brightness
setting. Should I skip this contrast step completely
(without hitting the start button)? Or should I hit
the start button and change the brightness settings
being well aware that I'm just going to change the
brightness level in the next step? I just want to be
assured that PM isn't going to generate a bad profile
because it was expecting to get a value from the
contrast step that I skipped. I gather that in
skipping that step the application is having to use an
assumed value, and I want to know the implications of
this assumed value when PM goes through its
mathematical manipulations to generate the profile.
When I do get to the step in which I need to select a
brightness level, PM prompts me to select an
unexpectedly low brightness--7 out of 16 bars on my
display, which PM reports as 44-53 Cd/m2. (PM doesn't
give the luminance directly, but when I create the
next profile a luminance value is listed in the system
status box, and I assume that to be the value from the
previous profile made. As a sidenote, I'd like to know
how to measure the luminance of my screen; I don't see
any spot measurement function for luminance in PM). If
I recreate a profile with the same settings in PM,
sometimes the brightness PM tells me to choose jumps
to 10 of the 16 bars on my display. This jump is
intermittant, and I'm always finding myself selecting
a brightness of 7 or 10 bars, nothing in between. Even
at 10 bars, I'm only up to 67 Cd/m2. Why is PM having
me choose such low brightness levels?
PROFILE ISSUES
In an attempt to be thorough, after generating a
profile, I've reprofiled immediately without changing
any settings in PM (the same brightness level is
chosen as well). What I've found, unfortnately, is
that color casts (usually red) appear intermittently.
The results are random... and very frustrating. The
color cast is most noticeable in the black background
after the first 15 patches of the calibration swatches
are measured and PM makes an adjustment before going
on to the optimization and chart patches. Has anyone
else seen such variability in profiles? Could it be
related to PM having me choose such a low brightness?
Any comments and advice would be greatly appreciated.
I had hoped to spend the holiday weekend doing
something a bit more entertaining than wrestling with
unpredictable profiles.
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