The SnapScan backend fails scanimage -T because it imposes a restriction on
the minimum size of a read (currently, you aren't allowed to ask for less
than a single scan line of data from the scanner).
This violates the SANE spec, but for normal local use (ie. not through
the net meta-backend) this works fine.
There is a revised implementation of the backend that does pass
scanimage -T, but it won't work in colour mode with your SnapScan 600.
This is something that should get fixed by sometime around mid-December,
after I move. When it does get fixed, version 1.0 will become the
new backend release, and the base for future modifications.
For the moment, try the backend out with your scanner. BTW, you should
get at least version 0.7 of the backend, available from
http://www.cs.ualberta.ca/~charter/SnapScan/snapscan.html
Earlier versions of the backend don't work with the new generic scsi
driver that has appeared in the series 2.2 Linux kernels.
I hope that helps,
Kevin
> Hallo,
> my AGFA SNAPSCAN 600 and
> scanimage [sane 1.01] -d snapscan:/dev/scanner -T say:
> scanimage: scanning image of size 2539x3420 pixels at 24 bits/pixel
> scanimage: acquiring RGB frame, 8 bits/sample
> scanimage: reading one scanline, 7617 bytes... FAIL No data
> scanimage: reading one byte... FAIL No data
> scanimage: stepped read, 2 bytes... FAIL No data
> scanimage: stepped read, 4 bytes... FAIL No data
> scanimage: stepped read, 8 bytes... FAIL No data
> scanimage: stepped read, 16 bytes... FAIL No data
> scanimage: stepped read, 32 bytes... FAIL No data
> scanimage: stepped read, 64 bytes... FAIL No data
> scanimage: stepped read, 128 bytes... FAIL No data
> scanimage: stepped read, 256 bytes... FAIL No data
> scanimage: stepped read, 512 bytes... FAIL No data
> scanimage: stepped read, 1024 bytes... FAIL No data
> scanimage: stepped read, 2048 bytes... FAIL No data
> scanimage: stepped read, 4096 bytes... FAIL No data
> scanimage: stepped read, 8192 bytes... FAIL No data
> scanimage: stepped read, 8191 bytes... FAIL No data
> scanimage: stepped read, 4095 bytes... FAIL No data
> scanimage: stepped read, 2047 bytes... FAIL No data
> scanimage: stepped read, 1023 bytes... FAIL No data
> scanimage: stepped read, 511 bytes... FAIL No data
> scanimage: stepped read, 255 bytes... FAIL No data
> scanimage: stepped read, 127 bytes... FAIL No data
> scanimage: stepped read, 63 bytes... FAIL No data
> scanimage: stepped read, 31 bytes... FAIL No data
> scanimage: stepped read, 15 bytes... FAIL No data
> scanimage: stepped read, 7 bytes... FAIL No data
> scanimage: stepped read, 3 bytes... FAIL No data
>
> What may be wrong?
> Every suggestion appreciated!
>
> TIA Erwin.
>
>
> --
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>
-- Kevin Charter charter@cs.rice.edu | charter@cs.ualberta.ca http://www.cs.rice.edu/~charter | http://www.cs.ualberta.ca/~charter
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