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

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

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

DEVICE NAMES
       This backend expects device names of the	form:

	      special

       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.

IMAGING	MODES
       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.

       Viewfinder
	      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.

       Thumbnail
	      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 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(1)  does
	      not work in Super	Resolution mode.  (xcam(1) and the non-preview
	      modes of scanimage(1) and	xscanimage(1) work fine, however.)

OTHER SETTINGS
       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
	      software.

CONFIGURATION
       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:

	      /dev/scanner
	      #	this is	a comment
	      /dev/sge

FILES
       /usr/local/etc/sane.d/dmc.conf
	      The   backend   configuration  file  (see	 also  description  of
	      SANE_CONFIG_DIR below).

       /usr/local/lib/sane/libsane-dmc.a
	      The static library implementing this backend.

       /usr/local/lib/sane/libsane-dmc.so
	      The shared library implementing this backend (present on systems
	      that support dynamic loading).

ENVIRONMENT
       SANE_CONFIG_DIR
	      This environment variable	specifies the list of directories that
	      may contain the configuration file.  On *NIX systems, the	direc-
	      tories are separated by a	colon (`:'), under OS/2, they are sep-
	      arated 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  /usr/lo-
	      cal/etc/sane.d.	If  the	value of the environment variable ends
	      with the directory separator character, then the default	direc-
	      tories  are searched after the explicitly	specified directories.
	      For example, setting SANE_CONFIG_DIR to "/tmp/config:" would re-
	      sult in directories tmp/config, ., and /usr/local/etc/sane.d be-
	      ing searched (in this order).

       SANE_DEBUG_DMC
	      If the library was compiled with debug support enabled, this en-
	      vironment	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.

BUGS
       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.

SEE ALSO
       sane(7),	sane-scsi(5)

AUTHOR
       Dianne Skoll <dianne@skoll.ca>

       The backend is derived from sane-hp(5) by David Mosberger.

				  13 Jul 2008			   sane-dmc(5)

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