[sane-devel] SANE calibration on Mac OS X Tiger

[Gerhard Jaeger]

On Wednesday 02 November 2005 18:46, Saul Good wrote:
> 
> On Nov 2, 2005, at 10:35 AM, Gerhard Jaeger wrote:
> 
> > On Wednesday 02 November 2005 15:15, Saul Good wrote:
> >> I have a CanoScan LiDE 30 and I am trying to use SANE as the  
> >> device driver.
> >> It installs fine and scans fine, but the scans come out very dark as
> >> compared to VueScan.  I've read the files on how to configure the
> >> plustek.conf (the driver SANE uses for the LiDE 30) and they do in  
> >> fact have
> >> a few settings, but they seem to be enabled properly.
> >>
> >> Here are scanning examples:
> >>
> >> VueScan
> >> http://img392.imageshack.us/img392/6182/vuescanl2sr.jpg
> >>
> >> SANE
> >> http://img392.imageshack.us/img392/4083/sanel7gd.jpg
> >>
> >> thanks so much in advance,
> >> ./sg
> >>
> > Which version? What bit-depth?
> > The latest CVS version should work fine. Try 8bit color scans.
> > If you use the 16bit then you need to tweak the data after scanning,
> > as the internal gamma-correction only works for 8bit scans.
> >
> > HTH
> > Gerhard
> 
> I am using 1.0.15 and 16 bits.  I will try the 8 bit scans.  Will  
> internal gamma-correction for 16bit work in future versions?

No, because the internal correction is only available for 8 bit scans.
For 16 bit, the LM9833 needs the memory for the scan-buffers. The correction
needs to be done in the frontend, i.e. XSane.

Gerhard