plustek: Scanning without lamp - how to?
Subject:
Re: Scanning without lamp - how to?
From:
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Date:
19 Feb 2001 09:59:07 -0000
Message-Id: <14Ukvo-0of7fUC@fwd05.sul.t-online.com>
Hi Andreas,
the lamp state is toggled by one bit in the ScanControl Register
(grep for AsicReg.RD_ScanControl).This register is often set,
but I think the lamp-bit is only set upon starting the scan.
You might have a look in file ptdrv.c at function
static void ptdrvLampTimerIrq( ULong ptr )
here you'll find an example howto switch off the lamp.
There's one thing which might will cause some trouble. Each
time you start to scan, the scanner will be calibrated. You might
need that step too, but the lamp needs to be on during this step.
So if you switch off the lamp, do it after the calibration step
(in function ptdrvRead().
Hope this helps
Gerhard
> Hi!
>
> I'm thinking about a special application of my Plustek OpticPro
9600P:
> I'd like to turn the lamp off while scanning, that means scanning
> without light inside the scanner.
> The reason is I need to scan some negatives of size 9x12cm (large
> format). So you may ask "why does this guy don't use a transparency
> scanner?" The simple answer: there is none scanning this size in
> transparency mode...
> The "transparency unit" would be a part of an enlarger put on top of
> the negative, but to use this the internal light has to be turned
off.
>
> How has the driver to be modified to swith off the light?
>
> Gruesse
> Andreas Irmer
>
>
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