Re: Repetitive Calibration with Optical
Re: Repetitive Calibration with Optical
- Subject: Re: Repetitive Calibration with Optical
- From: "Bertho Boman" <email@hidden>
- Date: Mon, 13 Jan 2003 08:11:37 -0500
- Organization: Vinland
Thanks for helping David.
This is frustrating. I bought the full ColorVision's Pro profiling
package based on good reviews and customer support, and it appears to
have been a good choice except I, and several others, are having basic
problems because of silly program interactions that should not exist.
Remember, I am new at this so I might be overlooking something obvious.
From a logical standpoint, shouldn't the monitor profiling and
adjustments be:
1. Get a "screwdriver" and tweak the monitors controls for best
performance.
2. Run a calibration program to measure and linearize the guns.
3. Create a profile.
1. Select desired color temperature, mini "black point" and the max
brightness. Attach the Spyder and at this time the software should
ignore all previous calibrations and profiling since we are just
tweaking the monitors hardware. That is not the case now since previous
calibrations are effecting the monitor settings and people get into
trouble by repetitive calibrations "walking" the adjustments out of
range. Also, why do a visual "black point" when I bought the Spyder? I
bought the Spyder so I do not have to rely on eyeballing it.
2. When running the "Calibrate" I expect the program to ignore previous
calibrations and profiles and do the measurements by itself. No user
options to enable or disable. At this time the monitor "screwdriver
adjustments" obviously will be in effect as should be since the program
can not change them.
3. Finally, the profile is generated and the program should
automatically apply the previous step's calibration.
I other words, If I repeat the sequence many times, nothing bad should
happen and I should always end up at the same point.
What do we have now? A confusing mess!
We have three programs that apparently do not know what the other one is
doing. Why in the world is there an option to set color temperature in
two places when one program calls the other one? I suspect that the
programs where written independently and then merged. Even worse, from
some of the other comments, it appears that PreCal acts differently if
run independently versus called from OptiCal.
I got into trouble because I carefully set the color temperature in both
OptiCal and PreCal to the same value. Obviously they ought to be the
same!
There are also obvious bugs that I am surprised to find since the
program has been around for a significant time. For example; I go step
by step through the calibration and then the profiling and then I
request a "info" printout. I get an error message that says that I have
to profile first. I just did!
Further we are told to not use precision mode for setting up the
OptiCal. Isn't that why we bought the program?
Yes, I am frustrated. I think the programs are very good by themselves
and they have the ability to be super, but they are hampered with some
minor user interface issues that are causing a lot of confusion and
problems.
What I think should be done is to remove the PreCal program as a
freestanding one and make it part of the OptiCal. I think 99% of the
problems would disappear if it the followed the logical three steps. No
multiple choices in several places.
These changes would be extremely simple to implement since they are just
changes to the user interface and not effecting the internal modules.
Hopefully we can see a unified program soon. It would be a boom to
everyone and much less tech support for ColorVision.
Bertho Boman
----- Original Message -----
From: <email@hidden>
To: <email@hidden>; <email@hidden>
>
The "Calibrate" button applies the video corrections built in the
"calibrate"
>
phase while building the profile built in the "profile" phase. Don't
go back
>
and forth to PreCAL while fooling with the setting in OptiCAL... you
might
>
manage to create some kind of problem. Simply leave the "calibration
on" (or
>
however its worded in your OS) checked, and you should be fine.
>
>
>
>
If you Precalibrate to 80 can. m/s, then set a white point other than
native
>
in OptiCAL, OptiCAL will force one or two of the guns to lower levels
to
>
balance the white point... lowering your total luminance. Using native
>
whitepoint in OptiCAL, and Standard instead of Precision will
eliminate two
>
places that the software could force changes between readings, and
should
>
show similar luminance numbers.
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