plustek: Aries Scan-It Pro 4800
Subject:
Re: Aries Scan-It Pro 4800
From:
"Jaeger, Gerhard" ####@####.####
Date:
15 Sep 2000 06:51:31 -0000
Message-Id: <00091508534502.00462@gja>
On Fre, 15 Sep 2000, Pieter Meiring wrote:
> Hi Gerhard,
> I have been playing around with the scanner a bit more and the following
> things have come to light:
> * Colour images at all resolutions misregister red/green/blue images
> * Gray scale images only work up to 150dpi - beyond that, and sometimes on
> this resolution for large images, images are "banded" with non-contiguous
> bands of image; sometimes with horizontal offset- the higher the resolution
> (300dpi max) the worse the banding.
> * Trying to scan an image of any size or resolution on "Colour32" mode gives a
> "scanner not started - Out of Memory" error.
>
> Pieter
Hi Pieter,
that all doesn't look that bad. First of all try the parameter mov=2
(see INSTALL file or man sane-plustek how to apply), this
should solve the colour problem.
The "banded" image problem is well known but unfortuneably not
solved. The problem is, that these old style scanners does not have
a large fifo. The fifo is needed to buffer data that can't be read
immediately, this is the case in multitasking systems like Linux.
In their former Windows drivers, Plustek simply disables the
multitasking stuff while scanning, but I think this not what
we want on Linux. I'm working on that problem and maybe sometime
I'll find a way. Tests have been shown, that if you're machine
has enough memory and you do nothing while scanning, the banding
effect almost disappears...
The colour32 mode has been disabled in the current backend, because
I couldn't get it work.
Have you tested the EPP mode of your BIOS (should be faster)?
Gerhard
BTW: Simply post to the mailing-list, I'll get your mails ;-)
