sane-pnm - SANE PNM image reader pseudo-backend


   The  sane-pnm  library  implements  a  SANE  (Scanner  Access Now Easy)
   backend that provides access  to  PNM  (Portable  aNyMap  files,  which
   covers  PBM  bitmap  files, PGM grayscale files, and PPM pixmap files).
   The purpose of this backend is primarily to aid in  debugging  of  SANE
   frontends.  It also serves as an illustrative example of a minimal SANE


   This backend provides two devices called 0 and 1.


   No configuration required.


          The static library implementing this backend.

          The shared library implementing this backend (present on systems
          that support dynamic loading).


          If  the  library  was  compiled with debug support enabled, this
          environment variable controls the debug level for this  backend.
          E.g.,  a  value  of 128 requests all debug output to be printed.
          Smaller levels reduce verbosity.


   If the pnm backend is installed and saned is used  to  allow  users  on
   remote computers to scan on the local machine, pnm files can be read by
   the remote user. This is limited to the files saned can access (usually
   it's  running  as user "sane"). All pnm files can be read if saned runs
   as root which isn't recommended anyway. The pnm backend is disabled  by
   default. If you want to use it, enable it with configure (see configure
   --help for details). Be sure that only trusted users can access the pnm
   backend over saned.


   Andreas Beck, Gordon Matzigkeit, and David Mosberger



                              14 Jul 2008                      sane-pnm(5)


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