[sane-devel] Scanning Lineart/Halftone with MICROTEK Scanmak
Karsten Festag
karsten.festag at t-online.de
Thu May 23 22:09:13 BST 2002
Joachim Backes wrote:
>
> Hi, Karsten,
>
> On 16-May-2002 Karsten Festag wrote:
> > 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?
>
> The cover of the scanner IS black!
Hmm, in this case the black paper probably won't help ;-)
Anyway, I think Oliver Rauch should make a statement if it
could be a xsane problem.
I think it isn't backend-related because the preview-image
seems to be correct.
>
> >
> > 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?
>
> Almost. Additionally, when scanning into the viewer, not only
> the viewer picture itself is blurred or shaked, but the file's
> contents too when saving the picture to some file.
Same as above - looks like an xsane issue only for the xsane
viewer mode. Oliver, do you agree?
Karsten
>
> Regards
>
> Joachim Backes
>
> --
>
> Joachim Backes <backes at 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 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 at 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 at 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
> > > > >
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