[sane-devel] Canon CanoScan LiDE 35

[Cameron Harris]

On 10/30/05, Pierre Willenbrock <pierre at pirsoft.dnsalias.org> wrote:
> Cameron Harris schrieb:
> > On 10/30/05, Pierre Willenbrock <pierre at pirsoft.dnsalias.org> wrote:
> >
> >>
> >>Thanks for the log.
> >>
> >>Please try the attached patch.
> >>I don't know if it helps. The backend is trying to read 1560000 bytes
> >>from the scanner, but libusb does not provide that much. We need to find
> >>out where the data is lost. The patch addresses one possible cause.
> >>
> >>Regards,
> >>  Pierre
> >>
> >
> > Ummmm.. well... good and bad news.
> >
> > The patch made it get past where it was stopping before, and now loads
> > of rubbish appears on the terminal when I do scanimage. I ran xsane to
> > see if it was scanning anything, hit acquire preview.
>
> The "loads of rubbish" actually are the requested image. scanimage
> outputs on stdout per default.
>
> >
> > The scanner made a few noises, then went "beeeeeeeeeeeeeeeeeeeeeeeep"
> > until the scan was done. While it was beeping, the scanner head was
> > lit green.
>
> Did the head move? xsanes default is to scan in grey mode, which is
> translated into a monochrome green scan.
>
> >
> > The image produced was just grey lines on a black-ish background. One
> > good thing is that if I open the scanner lid mid-scan, it seems to
> > have an effect on the image appearing on screen.
> >
> > Sane Screenshot: http://htsc01.b3ta.org/scan.png
> >
> > Where it gets lighter is where I opened the lid, and darker again when
> > I closed it.
> >
>
> I guess the calibration step failed.
>
> Each scan should look like this:
> - (optionally)move head home
> - blink lamp
> - move head away from home
> - blink lamp
> - move head home
> - (maybe) blink lamp
> - move head away from home
> - blink lamp
> - move head home
> - do a short scan
> - move head home
> - do the real scan
>
> If the head moved in the "short scan" part, please compress and send me
> black_white_shading.pnm. That image should be generated while using
> scanimage with SANE_DEBUG_GENESYS=255.
>
> > I'll try getting it onto a Windows system and actually making sure the
> > scanner works properly :|, maybe I could get a USB snoop while I'm at
> > it, just in case.
> >
>
> Regards,
>   Pierre
>
Fantastic! I just messed around with the lock button on the bottom of
the scanner, locking and unlocking a few times, then tilting it to the
side a bit.. and it works now!

All I can guess is that someone picked up the scanner when it was
unlocked and I wasn't looking and it made the scanner head lock in a
funny position... but now it works, so that's cool. :D It was the
bulkin patch that seemed to actually make it scan.

Thanks for your help :)
--
Cameron Harris