[sane-devel] sane-backends-1.0.31, issue with HP 5370C

[Ralph Little]

Hi,

On 2020-12-18 5:01 a.m., Byron Campbell via sane-devel wrote:
> Not sure if this is the best place to report a sane-backends issue,
> but I don't have a github account to report directly to upstream.
> Perhaps someone can relay the following as/if necessary?
>
> Regards, Byron Campbell
>
> ----------------------------------------------------------
>
> sane-backends-1.0.31,  issue with HP 5370C flatbed scanner,
>
> Problem: incorrect scan resolution (output image size)
>
> xsane-0.999 front-end settings:
>
> Normal
> Color
> Full Color Range
> 300 DPI
> 2544*3292 (21.6cm x 27.88cm)
>
> ISSUE: the resulting sane-backends output is a scanned image (out.pnm)
> size: 2544*6584, or double length; 2*3292=6584
> The best way I can describe the issue; sane-backends is not honoring
> xsane frontend settings, and I've experimented with ALL the settings.
>
> Additionally, I've verified that the problem is present and identical
> on Linux, OpenBSD, and FreeBSD using sane-backends-1.0.31 and
> xsane-0.999.
>
> Interestingly, the problem is nonexistent for an older backup machine
> that has sane-backends-1.0.29, but with the same xsane-0.999 frontend.
>
>
>
I have managed to reproduce this issue on my machine.
The output image is not expanded to twice the height, but an additional
block of white image is appended to the bottom of the scanned image
which is the same height as the scanned image, thus giving an image
twice as high.

I should also note that the machine that I have cannot do a preview. The
scan head just buzzes rather than moving down the platen.
That is probably a motor control issue with the resolution used for
preview scanning.

I have created an issue on GitLab for this issue, but I would strongly
suggest you create a GitLab account so that you can comment on and track
that issue.

https://gitlab.com/sane-project/backends/-/issues/402

Cheers,
Ralph