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)
       backend 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
       corresponds 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
       supports 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 does not
              work in Super Resolution mode.  (xcam and the non-preview modes
              of scanimage and xscanimage 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
              "Fluorescent" 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
       correspond 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
       /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.  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).

       SANE_DEBUG_DMC
              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.

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
       David F. Skoll

       The backend is derived from sane-hp by David Mosberger



                                  13 Jul 2008                      sane-dmc(5)
