sane-qcam - SANE backend for Connectix QuickCam cameras


   The  sane-qcam  library  implements  a  SANE  (Scanner Access Now Easy)
   backend that provides access Connectix QuickCam cameras.


   This backend expects device names of the form:


   Where port is the I/O port address at which the device  resides.   This
   address  is  normally  specified  in  hexadecimal using C syntax (e.g.,
   0x37b) and may be prefixed with the letter "u" (e.g., u0x37b) to  force
   the backend to access the camera in uni-directional mode.


   The contents of the qcam.conf file is a list port addresses that may be
   connected to a Connectix QuickCam.  Empty lines and everything starting
   from  a  hash  mark  (#) up to the end of a line are ignored.  A sample
   configuration file is shown below:

          0x37b  # /dev/lp0
          0x378  # /dev/lp1
          u0x278 # /dev/lp2 forced in uni-directional mode
          0x3bc  # /dev/lp0 (alternate address)

   In general, it is safest to list only the port  addresses  that  really
   correspond  to a QuickCam.  For example, if one of the listed addresses
   actually connect to a printer, then starting up this backend will cause
   the printer to perform a device reset (which is generally undesirable).


          The   backend   configuration  file  (see  also  description  of
          SANE_CONFIG_DIR below).

          The static library implementing this backend.

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


          This environment variable specifies the list of directories that
          may contain the configuration file.  Under UNIX, the directories
          are  separated  by a colon (`:'), under OS/2, they are separated
          by a semi-colon  (`;').   If  this  variable  is  not  set,  the
          configuration  file  is  searched  in  two  default directories:
          first,  the  current  working  directory  (".")  and   then   in
          /etc/sane.d.  If the value of the environment variable ends with
          the directory separator character, then the default  directories
          are  searched  after  the explicitly specified directories.  For
          example, setting SANE_CONFIG_DIR to "/tmp/config:" would  result
          in   directories  "tmp/config",  ".",  and  "/etc/sane.d"  being
          searched (in this order).

          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.


   David Mosberger


   Support is currently limited to the color version of the QuickCam.  The
   black-and-white camera is starting to work too, but I don't believe  it
   works  in all cases yet.  Reportedly, acquiring images of certain sizes
   work fine, but others result in shifted images (sounds like  a  problem
   due to byte-padding).

   The  program  needs root-privileges since it needs to be able to access
   the camera's I/O ports.



                              14 Jul 2008                     sane-qcam(5)


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