[sane-devel] Scanning Lineart/Halftone with MICROTEK Scanmaker
Karsten Festag
karsten.festag@t-online.de
Thu, 16 May 2002 22:37:39 +0200
Hi Joachim,
the function that finds the scanning area and calculates the
dashed rectangle is included only in xsane if I'm not wrong.
That's why in xscanimage you have to draw the scanning area
by hand. I don't know the way xsane calculates the scanning
area but it might be an issue of the contrast between the
sheet of paper and the background of your scanner lid. Maybe
a black paper as background does the trick?
There were some reports of garbled xsane lineart scans
earlier, perhaps Oliver Rauch knows something about this?
I tested this with my scanner: If you scan into a file or
for a fax or for photocopy then the pictures are o.k. as
well as the preview. Only the viewer makes problems. Is this
the same at you?
Regards,
Karsten
Joachim Backes wrote:
>
> On 06-May-2002 Karsten Festag wrote:
> > Hi Joachim,
> >
> > I will investigate this, but as I have no time in the moment it will be
> > not before next week.
> >
> > Does the same problems occur with xscanimage?
>
> Hi, Karsten,
>
> using xscanimage:
>
> 1. When using pre-view with xscanimage, then the dashed preview rectangle
> totally misses after prescan. I have to draw it myself.
>
> 2. The shake-effect together with xscanimage using lineart or halftone
> is heavily reduced (there is a little effect: letters have a small
> black-pixeled wreath which lets letters to be blurred).
> No problem when scanning in gray or colored mode.
>
> Regards
>
> Joachim Backes
>
> --
>
> Joachim Backes <backes@rhrk.uni-kl.de> | Univ. of Kaiserslautern
> Computer Center, High Performance Computing | Phone: +49-631-205-2438
> D-67653 Kaiserslautern, PO Box 3049, Germany | Fax: +49-631-205-3056
> ---------------------------------------------+------------------------
> WWW: http://hlrwm.rhrk.uni-kl.de/home/staff/backes.html
>
> >
> > regards,
> >
> > Karsten
> >
> > Joachim Backes schrieb:
> > > Hi,
> > >
> > > having problems with Microtek ScanMaker 96000 xl.
> > >
> > > Environment: Linux RedHat 7.2
> > > Kernel 2.4.18
> > > xsane-0.86
> > > sane-front/backend-1.0.7
> > >
> > > 1. The preview: When previewing a A4 Page with normal
> > > text on my ScanMaker 9600xl
> > > (A3 scanner), then after previewing, the dashed frame
> > > painted around the read
> > > page is not correct: horizontally, the frame correctly
> > > stops at the right margin
> > > of the A$ page, but the lower margin does not stop at
> > > the bottom of the A4 page,
> > > but at the bottom of the Scanners A3 pane. That means,
> > > the preview frame contains
> > > the rectangle u,v,w,x and not u,v,y,z
> > >
> > >
> > > u v
> > > +-------------------------+---------------+
> > > | | |
> > > | | | A3 Pane
> > > | | |
> > > | | |
> > > | | |
> > > | A4 sheet | |
> > > | | |
> > > | | |
> > > | | |
> > > | | |
> > > | | |
> > > | | |
> > > | | |
> > > | | |
> > > | | |
> > > | | |
> > > | | |
> > > | | |
> > > | | |
> > > | | |
> > > +-------------------------+ |
> > > |y z |
> > > | . |
> > > | . |
> > > | . |
> > > | . |
> > > | . |
> > > | . |
> > > +-------------------------+---------------+
> > > w x
> > >
> > > 2. Having problems when scanning in LineArt or Halftone
> > > mode: in the scan,
> > > a lot of horizontal pixel lines are shifted against
> > > each other, so you have a
> > > "shaked" not readable picture.
> > >
> > > Scanning in Grayscale/Color mode is OK.
> > >
> > > Regards
> > >
> > > Joachim Backes
> > >
> > > --
> > >
> > > Joachim Backes <backes@rhrk.uni-kl.de> | Univ. of
> > > Kaiserslautern
> > > Computer Center, High Performance Computing | Phone:
> > > +49-631-205-2438
> > > D-67653 Kaiserslautern, PO Box 3049, Germany | Fax:
> > > +49-631-205-3056
> > > ---------------------------------------------+----------
> > > --------------
> > > WWW: http://hlrwm.rhrk.uni-kl.de/home/staff/backes.html
> > >
> > >
> > > _______________________________________________
> > > Sane-devel mailing list
> > > Sane-devel@www.mostang.com
> > > http://www.mostang.com/mailman/listinfo/sane-devel
> > >
> > >
> > _______________________________________________
> > Sane-devel mailing list
> > Sane-devel@www.mostang.com
> > http://www.mostang.com/mailman/listinfo/sane-devel