[sane-devel] sane-coolscan3 --subframe behavior

wicked witch wicked-witch at gmx.net
Tue Aug 12 08:57:37 UTC 2014

Hi Zach,

I have the same problem. I looked at the code and could not find a way to
actually advance the film. (btw you can just download the code from the git
repository git://git.debian.org/sane/sane-backends.git )
We would have to find out the code to send to the scanner to advance. And I
have no clue how to approach that.

My workaround, although not completely satisfying, is to insert the film
strip with the first image cut to the border exactly. This way it turns out


2014-08-11 5:27 GMT+02:00 Zach Sterba <zas618 at gmail.com>:

> Dear Sane Developers,
> I am using sane-coolscan3 to scan negatives on a Nikon LS-50 ED with an
> SA-21 strip feeder.
> The --subframe option produces unexpected results: The right side of the
> image is "smeared" by the distance specified, rather than offsetting the
> entire frame (see attachment). I have several questions:
> 1. Should --subframe advance the film through the SA-21 rollers by the
> specified distance? or simply offset the scanner head?
> 2. Is the sane-coolscan3 source code available, and is there a community
> that can help me build and use new sane libraries?
> I need to offset the frame by any arbitrary distance, since the SA-21 does
> a poor job of automatically aligning frames. I am willing to get my hands
> dirty with some coding if necessary to make this happen.
> Thanks.
> Zach Sterba
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