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

[Marco Moock]

Am 07.09.2024 um 17:08:07 Uhr schrieb Ralph Little:

> On 2024-09-06 04:12, Marco Moock wrote:
> > Am Tue, 3 Sep 2024 17:55:36 -0700
> > schrieb Ralph Little <skelband at gmail.com>:  
> ...
> >> 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.  
> 
> I have merged some changes that were submitted 4 years ago which 
> improves this backend considerably: 
> https://gitlab.com/sane-project/backends/-/merge_requests/853
> The original MR languished in obscurity unfortunately. Apologies for
> not getting on top of that.

Thanks.

> The images are better and 150dpi now works. The general colour
> rendition still isn't great but the scans are consistent and fairly
> crisp. Preview seems to work consistently and I have not seen the
> crashing behaviour.

The crash behavior for 1200 dpi or the behavior that the first and
sometimes 2nd attempt to scan results in nothing and a hang of the
scanning application?

> 1200dpi gets further but still fails eventually. Looks like a
> buffering issue, because some data is received.
> You are using Debian, but if it helps, our nightly GIT PPA snapshot 
> should contain the changes tomorrow morning, assuming it doesn't fail 
> (again): https://launchpad.net/~sane-project/+archive/ubuntu/sane-git

It failed.
If that is fixed I will try the new version and report back.

-- 
kind regards
Marco