[sane-devel] How to get infrared image data with sane on an epson v700 scanner?

[Olaf Meeuwissen]

Alain Culos <sane-devel at asoundmove.net> writes:

>>  > scanimage -d epson2 -h
>> <...>
>> scanimage: open of device epson2 failed: Invalid argument
> <...>
>> However scanimage does not seem to recognise my scanner any longer (see
>> above), despite the version being the new one.
>>
>>  > scanimage --version
>> scanimage (sane-backends) 1.0.21; backend version 1.0.21
>
> Solved this problem: I was missing libusb-dev, now it finds my
> scanner, although only with the epson2 backend, not with the epkowa
> any longer.

The epkowa backend is *not* part of sane-backends.  It was removed
together with iscan when you removed libsane.  I suggest you grab
the source tarball and build that the same way as you build the
sane-backends.  You'll need to add the backend to dll.conf after
installation.

If you don't care for the iscan frontend, you can `--disable-frontend`
at `./configure` time and save some CPU cycles (but you may still need
to satisfy some frontend build dependencies :-().

> This is not an immediate issue for me, but I'd appreciate pointer in
> the right direction. The epson2 driver now restricts me in terms of
> scan resolution.  [...]
> When with the epkowa backend of the previous version this was:
> --resolution 25..12800dpi (in steps of 1) [300]
>
> A key resolution is 4800, the other one is Ok as it is 6400.

The epkowa backend may give you 4800dpi, but it won't do infrared.

Hope this helps,
-- 
Olaf Meeuwissen, LPIC-2           FLOSS Engineer -- AVASYS CORPORATION
FSF Associate Member #1962               Help support software freedom
                 http://www.fsf.org/jf?referrer=1962