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sane-pnm(5)									      sane-pnm(5)

       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 primarly to aid in debugging of
       SANE frontends.	It also serves as an illustrative example of a minimal SANE backend.

       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


					  22 April 2001 			      sane-pnm(5)
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