Hi,
On Tuesday 30 November 2004 17:16, Eric Ding wrote:
> The lowest "next" resolution up is 100dpi; anything in between rounds
> either down to 75dpi or up to 100dpi. Things seem to work just fine at
> 100 dpi, though...
>
> The latest version of sane seems to allow an attempt at 50 dpi; this
> also fails in Lineart mode, but not in other modes.
you might wanna try and tweak the motor settings, checkout file
plustek-usbdevs.c and search for MODEL_CANON1200, you will find something
like:
{ MODEL_CANON1200, 8, 51, 3,
/* Motor settings (PWM and PWM_Duty) */
/* <=75dpi <=100dpi <=150dpi <=200dpi
<=300dpi */
{{ 8, 31, 1 }, { 8, 31, 1 }, { 8, 31, 1 }, { 8, 31, 1 }, { 8,
31, 1 },
/* <=400dpi <=600dpi <=800dpi <=1200dpi
<=2400dpi */
{ 8, 31, 1 }, { 8, 31, 1 }, { 8, 31, 1 }, { 8, 31, 1 }, { 8,
31, 1 }},
/* Color mode MCLK settings */
{ 3.0, 3.0, 3.0, 3.0, 3.0, 3.0, 3.0, 3.0, 3.0, 3.0 },
{ 3.0, 3.0, 3.0, 3.0, 3.0, 3.0, 5.0, 6.0, 6.0, 6.0 },
/* Gray mode MCLK settings */
{ 6.0, 6.0, XXX.0, 6.0, 6.0, 6.0, 6.0, 6.0, 6.0, 6.0 },
{ 6.5, 6.5, 6.0, 6.0, 6.0, 6.0, 8.0, 12.0, 12.0, 12.0 }
},
tweak the settings for "Gray mode" and <= 150dpi (where the XXX is located),
you may increase the value to 7 or 8...
Ciao,
Gerhard
>
> Eric
>
> Gerhard Jaeger <gerh...@gjaeger.de> wrote:
>
> > Hi,
> >
> > On Saturday 27 November 2004 20:24, Eric Ding wrote:
> > > I'm using sane-backends 1.0.15 with libusb on Gentoo Linux with a Canon
> > > N1240U scanner.
> > >
> > > When I try to scan in Lineart mode at 75dpi, I get a few back-and-forth
> > > pauses, then a significant buzzing sound as the scanner's (green) light
> > > is on, but the light bar doesn't move at all. Scanning in other modes
> > > (i.e., Gray, Color) or in Lineart mode with higher resolutions (i.e.,
> > > 96, 300, etc.) works fine.
> > >
> > > Scanning with these settings using Canon's Windows driver works, so I
> > > conclude that this is likely an issue with the SANE plustek backend.
> > > Below find the stderr output of running
> > >
> > > scanimage --mode Lineart --resolution=75
> > >
> > > with SANE_DEBUG_PLUSTEK set to 13. Have I found a bug? Can anyone
> > > confirm or deny this behavior?
> > >
> > > Thanks,
> > > Eric
> > [SNIPSNAP]
> >
> > I've tested that here and have no problems so far. It might be, that the
> > motor settings for this mode are somewhat at or slightly beyond the limit
> > so that some devices have no problems while others have...
> > Can you do some more tests, i.e. increase the resolution and check when it's
> > working?
> >
> > Ciao,
> > Gerhard
> >
> >
>
