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sane-dmc(5)		 SANE Scanner Access Now Easy		   sane-dmc(5)

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

       The  sane-dmc library implements a SANE (Scanner Access Now Easy) back‐
       end 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	corre‐
       sponds  to the scanner.	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 sup‐
       ports 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

       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 software,  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  "Fluores‐
	      cent"  white balances.  This setting more-or-less corresponds to
	      the "Color Temperature" settings on Polaroid's Windows  and  Mac

       The contents of the dmc.conf file is a list of device names that corre‐
       spond to DMC scanners.  Empty lines and lines starting with a hash mark
       (#) are ignored.	 A sample configuration 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 config‐
	      uration  file is searched in two default directories: first, the
	      current	working	  directory   (".")   and   then   in	 /sys‐
	      tem/resources/sane-backends/1.0.18/etc/sane.d.   If the value of
	      the environment variable ends with the directory separator char‐
	      acter,  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	 "/system/resources/sane-back‐
	      ends/1.0.18/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

       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

sane-backends 1.0.18		  13 May 1998			   sane-dmc(5)

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