[sane-devel] Re: epson 3490 - transparency unit problem

Jim MacLeod j75trym at blueyonder.co.uk
Sun Nov 13 19:25:34 UTC 2005

Oliver Schwartz wrote:

> Hi,
>> I've just bought an epson 3490, and download the
>> sane-backends-2005-11-10.tar.gz and
>> sane-frontends-2005-11-10.tar.gz.
>> While the flatbed seems to work as expected, the transparency unit
>> doesn't.
>> I want to scan a negative film, but the resulting file is crossed
>> by a thick green line.
>> I've tried to scan at different scan resolution and bit depth, but
>> the resulting scan is always bad. The higher the resolution is the
>> thicker the green line is.
> I haven't looked at the transparency specific stuff for the 3490 yet.
> As it doesn't work out of the box I'll need an USB trace from the
> windows driver first. Do you think you can provide one?
I'm using the tpu on the 3490 with backend-11-10. It works ok though the
scans seem quite dark compared to the original slide. However adjusting the
gamma settings on the scanned file gives a nice 1024x768 display size.
I'm very much a newbie at this so sorry I can't give more detailed info.

> You need to install an USB sniffer first. I prefer USBSnoop which is
> available from http://benoit.papillault.free.fr/usbsnoop/ . The page
> also gives basic instructions on how to use it.
> Once it works you should start logging and do a preview scan and a
> scan of a very small area in low resolution, both times using the
> transparency adapter. The log files tend to get quite large, but it
> should shrink to a manageable size after zipping. Please send it to
> me directly, not to the list.
> Regards,
> Oliver

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