Hi,
On Sun, 2 Jan 2000, Bernd Schroeder wrote:
>
> > Finally, I discovered that while mirroring is solved for the
> > scanned image and the previews, there is a little problem
> > remaining: if the area to scan is at the upper left part of the
> > scanner's window, I have to mark the upper right part to have the
> > desired area scanned! So the selected area in xsane or xscanimage
> > is still mirrored while the image itself is not anymore. I
> > suppose the upper-left and lower-right coordinates which delimit
> > this area are not recalculated by the backend while the image and
> > the preview are mirrored.
>
> Looks as if this scanning direction 'right to left' has more implications
> than its looks at first sight. I have uploaded a new version of the
> backend to
>
> ftp://ftp.muc.de/people/bernds/mtek2/microtek2-pre0.9.020100.tar.gz ,
>
> which should at least fix this problem.
>
I have tested the new backend, here is the report:
- mirroring is now OK even in the preview window
- when backend-calibration is on, there are still crashes. I discovered
that these always occur if there was no preview scan with backend-
calibration on, while (most of the time) there is no crash when I do
a preview scan with calib on. I did not test the previous version
(0.8), but I suppose it had to have the same behaviour.
- now something surprising: images scanned with calibration are
worse than those scanned without, as they have a strong blue tint!
Effectively, scanning a white sheet of paper and looking at the
histograms shows that while R and G histograms are very close to
each other, the blue histogram is markedly shifted towards brighter
intensities. Without backend-calibration, the left-to-right order
of the three histograms is different, but clearly there is no such
a shift in respect to blue channel. I haven't had time to retest
with previous backend release, but do not remember having a
similar result with it. Did you change something inbetween?
Finally, I am very interested to know how did you trace the commands sent
by the twain driver with scantest.exe? If I could do the same, maybe it
would be easier to find what is the trick of the driver under Windows.
Unfortunately, I was unable to get my scanner recognised with recent
releases of WINE, while the version shipped with Debian Slink (2.1) did
the job, but then scanimage.exe crashed right after. Maybe it is important
to mention that I used Windows 3.1 (and the 16 bit version of the drivers
and executables).
Levente
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