[sane-devel] UMAX scanner problems

[Gerhard Jaeger]

Hi Richard,

as Henning already suggested, please use the latest version. There
your problems are solved:
- lamp switching is fixed
- UMAX 3400 works correctly

1.0.8 has only a bad 3400 support based on lot of assuptions...
Another thing:
The buttons of these devices are in general not supported. On windoze
machines the button-states are normally polled by the driver and accordin=
g
to the states, the software decides what to do - and currently we have no=
=20
button support here - although often wished ;-)

Cheers
  Gerhard

On Sonntag, 9. M=E4rz 2003 16:33, Richard M. Teitel wrote:
> Developers,
>
> First, let me apologize in advance for the length of this message.  I a=
m
> trying to solve several problems, which I believe to be related.
>
> I am running Red Hat Linux 8.0 on a 700 MHZ Pentium III using a UMAX
> Astra 3400 flatbed scanner connected to the USB port.  Red Hat came wit=
h
> sane-backends-1.0.8, which includes the sane-plustek.5.gz package (I'm
> not sure which release this is).  According to the documentation I've
> read, these are the most recent releases and should work with the UMAX
> scanner.  Indeed, the scanner is detected using modprobe (thanks to
> Henning), and I am able to run the scanner from either the XSANE
> front-end (version 0.84) or GIMP, using the Plustek backend.  I have
> successfully copied and faxed B&W images.  But all is not well :-(
>
> First, the Preview function does not work.  When I run Preview, the
> scanner makes an odd "clicking" noise as it scans and does not produce
> an image.  I am able to use the Preview function to set the scan area,
> but that's all.
>
> Second, the Lamp Off After Scan function does not work.  I set it for
> several different time intervals (from 5 to 30 seconds), but the lamp
> never turned off.  It does turn off when I close SANE, after I edited
> the Plustek driver to do so.  Also, the front panel "Power Saver" butto=
n
> does not turn off the lamp (according to the UMAX tech rep, the button
> sends a command to the software to turn the lamp off).  I suspect this
> problem leads to other problems having to do with overheating of the CC=
D
> sensor, since the quality of the first image is better than succeeding
> images.
>
> Third, the quality of color images scanned from photographs is terrible=
=2E
> I have attached a copy of a color image scanned from a photograph.  The
> brightness, contrast and color of the photo are good.  The scanned
> images appear to be overexposed and "bloom" badly.  My initial thought
> was that the color saturation was way too high.  The problem gets worse
> as the scanner heats up (since the lamp doesn't shut off), and I have
> been unable to correct the brightness, contrast, or color settings
> enough to make the images look good.  I tried adjusting the brightness
> and contrast of the scanner using the SANE backend, and the quality
> improved some, but not much.  I have not tried scanning from the comman=
d
> line.
>
> As a final note, I used to run this scanner under Win98SE using
> Vistascan and Photodeluxe and everything worked well, so I know the
> scanner works correctly.
>
> I would very much appreciate any help you can offer.  I am not a
> developer, but have enough computer experience to do some
> trouble-shooting and file editing.
>
> Thanks,
> Rich Teitel