On 21 Jan 2001, at 12:25, Henning Meier-Geinitz wrote:
> > Scanned color images show horizontal lines, one pixel high. The
> > colors of these lines are clearly off. They seem to lack one or two of
> > the RGB components.
> From your image it looks like they occur at the border between two
> scan buffers (64k). You may check this by setting option buffersize to
> something other than 128
I tried that. It doesn't seem to make a difference. Check the results if
you want on:
http://www.xs4all.nl/~ferencj/stripe2.html
> It's one possibility for stripes. It doesn't look like a line distance
> problem, however.
>> The scanner is tied to a nameless NCR810 SCSI card, no other
>> SCSI devices are involved.
> I have also some sort of NCR810 Clone but at the moment I'm using an
> Adaptec 2940.
Ah. I just remembered something. I have tried to connect the
scanner and a zip drive to one NCR810 card on another machine.
Under Windows 98 this yielded results very much like my current
images. Maybe this is a SCSI [cabling] problem? It worked in
another machine though.
I've read somewhere (in SANE docs?) that this Mustek should be
terminated (by me). But my active terminator makes the line
phenomena a lot worse. What is it with this scanner? Doesn't it
follow SCSI specs, or has it auto-termination?
> I will try the 810 later. I'm using the following option
> in modules.conf: options ncr53c8xx ncr53c8xx="disc:n"
> But I don't think it will change anything.
Nope. Not at all.
> The debug log doesn't look unusual. Can you send a debug log of an
> actual scan (with stripes) to me directly (not the list)?
Ok. If anyone else is interested, find it on:
http://www.xs4all.nl/~ferencj/sane_debug.html
Well, it does seem to be a SCSI problem, or am I wrong. Maybe it's
not working now because this particular machine doesn't have
enough power (VA) to drive the SCSI bus or the Mustek auto-
termination? Or something like that? I'm guessing here.
There's another NCR810 (Asus SC200) card in there (to connect
afore mentioned ZIP drive). I'll try that one (again) but it didn't work
before. If that doesn't make a difference, I'll look inside the scanner,
maybe I can remove the termination or something else is wrong. If I
break it, it needed repair anyway! :-)
cheers
Ferenc
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