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sane-dmc(5)									      sane-dmc(5)

       sane-dmc - SANE backend for the Polaroid Digital Microscope Camera

       The  sane-dmc  library  implements  a SANE (Scanner Access Now Easy) backend that provides
       access to the Polaroid Digital Microscope Camera.

       This backend expects device names of the form:


       Where special is the UNIX path-name for the special device that corresponds to  the  scan-
       ner.  The special device name must be a generic SCSI device or a symlink to such a device.
       Under Linux, such a device name could be /dev/sga or /dev/sge, for example.

       The Polaroid DMC supports a number of imaging modes.  This driver  supports  five  of  the
       imaging modes:

       Full Frame
	      This mode corresponds to the 801-by-600 pixel full-color full-frame image.

	      This  mode  corresponds  to the 270-by-201 pixel grey-scale viewfinder image.  This
	      image is acquired very quickly.

       Raw    This mode corresponds to the 1599-by-600 pixel "raw" image from  the  CCD.   It  is
	      grey-scale,  with  pixels  alternating  horizontally  between  red,  green and blue
	      stripes.	The pixels are twice as high as they are wide, so the image is distorted.

	      This mode corresponds to the 80-by-60 pixel full-color thumbnail image.

       Super Resolution
	      This image is a 1599-by-1200 pixel full-color image constructed  by  filtering  and
	      interpolating  the  "raw"  image.  The filtering and interpolation is done in soft-
	      ware, so this mode is very slow.	Also, this mode places restrictions  on  how  the
	      image  is  read  which means that the "preview" mode of xscanimage does not work in
	      Super Resolution mode.  (xcam and the non-preview modes of scanimage and xscanimage
	      work fine, however.)

       ASA Setting
	      This  setting  adjusts  the camera's sensitivity.  You can choose one of 25, 50, or
	      100 "equivalent" ASA.

       Shutter Speed
	      You can select a shutter speed from 8 to 1000 milliseconds.  The shutter	speed  is
	      quantized in units of 32 microseconds.

       White Balance
	      You  can	choose one of "Daylight", "Incandescent" or "Fluorescent" white balances.
	      This setting more-or-less  corresponds  to  the  "Color  Temperature"  settings  on
	      Polaroid's Windows and Mac software.

       The  contents  of the dmc.conf file is a list of device names that correspond to DMC scan-
       ners.  Empty lines and lines starting with a hash mark (#) are ignored.	A sample configu-
       ration file is shown below:

	      # this is a comment

	      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.

       In the "Full Frame" and "Raw" modes, images must be read in units of  entire  lines.   The
       driver  performs  no buffering in these modes; if you ask sane_read to read a non-integral
       number of lines, it may read less than you ask for.  If you ask	sane_read  to  read  less
       than a single line, it returns SANE_STATUS_INVAL.

       In  the "Super Resolution" mode, images must be read in units of two lines (3198 pixels or
       9594 bytes.)  If you try to read less than two  lines,  you  get  SANE_STATUS_INVAL.   The
       Super Resolution mode is very slow.

       In  the	"Viewfinder"  and  "Thumbnail"	modes,	the entire image must be read in one SCSI
       transfer.  In this case, the driver performs buffering and you can read the  image  in  as
       small an increment as you like.

       sane(7), sane-scsi(5)

       David F. Skoll

       The backend is derived from sane-hp by David Mosberger

					   13 May 1998				      sane-dmc(5)
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