Provided by: libsane-common_1.1.1-5ubuntu1_all bug


       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.   On  *NIX  systems,  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



                                           14 Jul 2008                               sane-qcam(5)