sane-dmc.5

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)