[sane-devel] frame and batch mode

Jonathan Buzzard jonathan at buzzard.me.uk
Tue Dec 18 17:37:22 UTC 2007

On Tue, 2007-12-18 at 08:40 -0500, m. allan noah wrote:
> On 12/18/07, Giuseppe Sacco <giuseppe at eppesuigoccas.homedns.org> wrote:
> > Il giorno mar, 18/12/2007 alle 12.00 +0000, Jonathan Buzzard ha scritto:
> > > On Tue, 2007-12-18 at 12:13 +0100, Giuseppe Sacco wrote:
> > [...]
> > > > So, my questions: is there already any standard for those action? Is
> > > > there any defined rule for how to name a backend parameter like
> > > > "--frame-number"? Is there any way to know what feeder types are
> > > > available at a given time?
> > >
> > > Good grief, those feelings of déja vu. are pretty strong at the moment.
> > >
> > > The basics are that as it stands the SANE standard is heavily geared to
> > > transmission scanning on flatbed scanners. Understandable as it probably
> > > accounts for 99% of users requirements.
> >
> > Is this problem "solved" with SANE2?
> would both of you please excuse my ignorance, as i primarily deal with
> ADF machines, but-
> why does the front-end need to be involved in the movement at all? can
> the backend not detect the additional slides and move the feeder
> automatically? perhaps i am not picturing the mechanism correctly...

Imagine I have just stuck an APS adaptor into my film scanner and loaded
up a 40 frame APS film. I wish to scan *one* frame which I happen to
know from the contact print I got when they where developed.

How without the front end telling the scanner which frame to advance to
and scan do you propose scanning this? From memory a TIFF image from an
APS frame on my scanner is about 30MB and takes about 1min over 400Mbps
Firewire. Scanning the lot is utterly impractical.

With 35mm film, I load the strip into a holder and insert the holder. I
want to scan just two frames from the possible six in the holder, and
they are frame 2 and 4. Oh and I want to scan 4 first so that it is not
sticking out the scanner with dust settling on it.

Does that illustrate the point?


Jonathan A. Buzzard                 Email: jonathan (at) buzzard.me.uk
Northumberland, United Kingdom.       Tel: +44 1661-832195

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