[clug] SANE and scanners

[Simon Oxwell]

On 20 March 2015 at 13:04, Rodney <rodneyp at pcug.org.au> wrote:

> On Fri, 20 Mar 2015 12:39:09 Simon Oxwell wrote:
> > On 20 March 2015 at 12:26, Brett Worth <brett.worth at gmail.com> wrote:
> > > On 20/03/15 12:14, Simon Oxwell wrote:
> > > > I'm running what seems to be the lastest of the SANE backends
> (1.0.24).
> > > > I've got things working, but I seem to have an odd brightness issue,
> > >
> > > where
> > >
> > > > scans are noticeably light on the left and dark on the right. I've
> made
> > > > sure I've run the calibration mode and that doesn't seem to have
> helped.
> > > >
> > > > Anyone have any suggestions? My google-fu hasn't turned up anything
> > >
> > > useful.
> > >
> > > Is this happening only on Linux?  If yes then ignore the rest of this.
> > >
> > > I had a problem with a scanned doing inconsistent intensity across the
> > > page which turned
> > > out to be a dry joint on the connection to the fluro.  If you put on
> some
> > > welding glasses
> > > on (:-)) and watch the light move across the page you might see it
> > > changing brightness.
> > >
> > > Of course if the gradient is at right angles to the gantry travel it
> could
> > > just be a bad
> > > fluro.  Once again you should be able to see that if the brightness
> varies
> > > along the tube.
> >
> > Hi Brett,
> >
> > Yeah, just In linux, sadly. Windows driver doesn't exhibit the same
> > behaviour.   The gradient is at right angle to gantry travel, but is lit
> > with LED's, which seem fine.
> >
> >
> > Simon
>
> Have you used the driver recommended at http://sane-project.org ?
> Perhaps non-intuitively it is Plustek, not
> Canon.
>
> I have occassionally used a Canon 660U, also with Plustek and it
> w-o-r-k-s, with acceptable quality, if time is
> not of the essence.
>

Hi Rod,

Yep, using the plustek driver. Interesting, I did have this working years
ago (like, 2008) with what would have been a really old version of SANE,
but by the time backends got 1.0.22, the servo speeds for the N650U were
completely broken and had to backport a package for 1.0.24.

Thanks for the suggestion, though.


Simon