I'm the main developer of the external 'niash' backend
with support for the Hewlett-Packard 3300C, 3400C, 4300C and
the Agfa Snapscan Touch.
Generally the backend provides the basic functionality, i.e.
scanning at 150, 300 and 600 dpi, adjustable scanning area,
control of the 12-to-8-bit gamma table, simple calibration
before each scan, color scan only.
Support for the HP3300C is good. The HP3400C and 4300C use
some hacks in order to achieve 150 dpi and 600 dpi resolution.
Support for the Agfa Snapscan Touch is basically the same as
for the HP3300c (the CCD is mounted the other way around),
but has probably not been tested as much.
The sources are currently licensed under GPL.
Project page is at:
Sources can be found at:
Can the sane maintainers have a look at it and see what's
needed to have this included into sane?