[sane-devel] ScanJet 4400c 1200 dpi IO error

[Ralph Little]

Hi,

On 2024-09-03 11:19, Ralph Little wrote:
> Hi,
>
> On Tue, Sep 3, 2024 at 11:14 AM Marco Moock <mm at dorfdsl.de> wrote:
>
>     Am 03.09.2024 um 11:11:08 Uhr schrieb Ralph Little:
>
>     > Hi,
>     >
>     >
>     > On Sat, Aug 31, 2024 at 5:32 AM Marco Moock <mm at dorfdsl.de> wrote:
>     >
>     > > Hello!
>     > >
>     > > If I scan with 1200 DPI with the ScanJet 4400c I get device IO
>     error
>     > > every time after the scan started.
>     > >
>     > > m at ryz:~$ scanimage --format png --output-file=test1200.png -d
>     > > 'rts8891:libusb:001:006'  --resolution 1200 -v
>     > > scanimage: scanning image of size 10158x14078 pixels at 24
>     > > bits/pixel scanimage: acquiring RGB frame
>     > > scanimage: min/max graylevel value = 0/214
>     > > scanimage: sane_read: Error during device I/O
>     > > m at ryz:~$
>     > >
>     > > 600 dpi (and others) don't produce that error.
>     > >
>     >
>     > > Please tell me if you need further information.
>     > >
>     >
>     > Could you tell us the version of SANE that you have?
>
>     Of course, sorry that I forgot that.
>
>     > scanimage -V
>
>     scanimage (sane-backends) 1.2.1-debian; backend version 1.2.1
>
>     > And perhaps which platform and version?
>
>     Debian Unstable amd64
>
>
> Thanks. I do have one of these. It is supported by the rts8891 backend.
> I will try to drag it out later to reproduce.
>
>

OK, I have not used this scanner before: I had to find a power brick for it.
The results are not great TBH.

In xsane, preview mode seemed to have trouble scanning at all. The 
carriage stalled and wouldn't move.
Later, after some other scanning activity xsane/preview seemed to work 
OK. The calibration is pretty awful but I got an image.
Perhaps in storage the carriage motor was a bit stiff.

Tried various resolutions in colour scan mode using scanimage:

75 - scans OK, but the image is a little light.
150 - seems to go through the motions, but the scanned image is blank.
300 - scans OK
600 - scans OK
1200 - starts to scan then gets the error that you reported.

Are your experiences similar?

Cheers,
Ralph

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