primax: D600 Calibration Problem?
Subject:
Re: D600 Calibration Problem?
From:
Andre Herms ####@####.####
Date:
11 Feb 2002 10:53:50 -0000
Message-Id: <200202111049.g1BAnDX03533@sunny.urz.uni-magdeburg.de>
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Hi,
> Is there a description anywhere of what the scanner is trying to do during
> calibration? I read in earlier posts that Primax released some
> documentation, is this still available?
>
> My assumptions are:
>
> 1. There are three passes of the calibration area during this process, one
> each for Cyan, Magenta and Yellow.
I think, it's Red, Green and Blue.
> If I remove the calibration code then
> the scan works, but the colour registration is poor.
Does it really work with the D600 and the whole scan area. Did you try this
with primaxd?
> 2. A value for white and black is generated for each pixel(?) of the CCD
> and these are put in a table. These are factored into the scanned values to
> give a common brilliance level across the page.
>
> If anyone can shed some more light on this area, it will be gratefully
> received.
Hmm - I read a little bit in the sane newsgroup. There are other scanners
that work simmilar. The CCD contains many sensors, that don't give the same
output for the same scanned color. So a correction value for every sensor is
calculated and put into the registers. At the front of the scanner should be
a black and white stripe (I hope so as I cannot see there). This area is
scanned and used for the value correction.
So far what I know.
Andre
- --
Andre Herms ####@####.####
http://www.cs.uni-magdeburg.de/~aherms
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