[sane-devel] hp scanjet 5300c works, but not with SaneTwain

[Yves Jeanrenaud]

Hi Erik,

thanks for your fast response. I will try this. Ineed, the scanner is
quite old and looks quite dusty.

I found out some more details. it seems to be connected to the
resolution. using 100 dpi it works, 150 fails at about 12.5%:
scanimage -p -v --resolution 150 > /www/tmp/test.pnm
scanimage: scanning image of size 1264x1765 pixels at 24 bits/pixel
scanimage: acquiring RGB frame
scanimage: min/max graylevel value = 102/255
scanimage: sane_read: Error during device I/O

so, to me this supports your tipp. I try to clean the scanner parts
and report on the results

regards,

Yves

2010/8/30 Erik Lotspeich <erik at lotspeich.org>:
> Hi,
>
> I had a similar problem with my HP Scanjet 6300.  Although I fiddled
> with the timeout in the libsane code, I found that the real problem was
> dust!  Although the glass was clean, the internal mirrors were covered
> in a thick layer of dust and the scanner was having trouble
> self-calibrating.  Cleaning the internal mirrors made the scanner
> operate much faster, more reliably and with better image quality!
>
> Regards,
>
> Erik
>
> Yves Jeanrenaud wrote:
>> Hi all,
>> again, issues with sane. I compiled latest built successfull again,
>> all working, inted too. from console I can scan perfectly, but when I
>> use sanetwain on windows (used to work before with same config but
>> different scanner) it fails.
>> the program finds the server and the scanner. preview works perfectly,
>> but when scanning, the scanner starts to move like usually, sanetwain
>> seems to receive not all data. the progress bar stops after some
>> inches and the scanner finishes its work. then, sanetwain throws a
>> "timeout when reading word from socket"
>> what can I do about this?
>>
>> regards,
>>
>> yves
>>
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