# Re: Writing Fujitsu M3091 backend

From: Frederik Ramm (frederik@remote.org)
Date: Thu Mar 01 2001 - 12:08:01 PST

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  Hi,

  > This is why the status code does exist. I think it does not make a
  > difference here if the scanner scans a new page, the backside of a page
  > or gets the image from memory.

  It does make a difference I think. If the front-end is expected to do
  something automatically - even if it's just saving the images with
  proper names - it would be good to know whether a certain image is
  "another image derived from the same sheet of paper" or "a new image
  derived from a new sheet of paper". You would probably want to assign
  different file names.

  Of course it can be "guessed" - if the front-end knows that duplex
  mode is on, every other image that the scanner delivers will probably
  be a back side - but that's not exactly cool. For example I've been
  looking at the Bell+Howell driver and saw that these scanners may
  produce a multitude of images from one page - things like "front
  thumbnail", "front barcode", whatever.

  So, in "some future version" of SANE, there ought to be a mechanism by
  which the backend can inform the front-end of the intrinsic relation-
  ships between images it delivers.

  Of course, for the time being, I'm quite happy with the "ADF out of
  documents" option since it works without having to wait for the
  committee to approve the design for a suggestion on a draft outline of
  a probable future... you get the point :-)

  Bye
  Frederik

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