1sane-dmc(5)              SANE Scanner Access Now Easy              sane-dmc(5)
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NAME

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

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

13       This backend expects device names of the form:
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15              special
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17       Where special is the UNIX path-name for the special device that  corre‐
18       sponds  to the scanner.  The special device name must be a generic SCSI
19       device or a symlink to such a device.  Under Linux, such a device  name
20       could be /dev/sga or /dev/sge, for example.
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IMAGING MODES

23       The  Polaroid DMC supports a number of imaging modes.  This driver sup‐
24       ports five of the imaging modes:
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26       Full Frame
27              This mode corresponds to the 801-by-600 pixel  full-color  full-
28              frame image.
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30       Viewfinder
31              This   mode  corresponds  to  the  270-by-201  pixel  grey-scale
32              viewfinder image.  This image is acquired very quickly.
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34       Raw    This mode corresponds to the 1599-by-600 pixel "raw" image  from
35              the CCD.  It is grey-scale, with pixels alternating horizontally
36              between red, green and blue stripes.  The pixels  are  twice  as
37              high as they are wide, so the image is distorted.
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39       Thumbnail
40              This mode corresponds to the 80-by-60 pixel full-color thumbnail
41              image.
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43       Super Resolution
44              This image is a 1599-by-1200 pixel full-color image  constructed
45              by  filtering  and interpolating the "raw" image.  The filtering
46              and interpolation is done in software,  so  this  mode  is  very
47              slow.   Also,  this mode places restrictions on how the image is
48              read which means that the "preview" mode of xscanimage does  not
49              work  in Super Resolution mode.  (xcam and the non-preview modes
50              of scanimage and xscanimage work fine, however.)
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OTHER SETTINGS

53       ASA Setting
54              This setting adjusts the camera's sensitivity.  You  can  choose
55              one of 25, 50, or 100 "equivalent" ASA.
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57       Shutter Speed
58              You can select a shutter speed from 8 to 1000 milliseconds.  The
59              shutter speed is quantized in units of 32 microseconds.
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61       White Balance
62              You can choose one of "Daylight",  "Incandescent"  or  "Fluores‐
63              cent"  white balances.  This setting more-or-less corresponds to
64              the "Color Temperature" settings on Polaroid's Windows  and  Mac
65              software.
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CONFIGURATION

68       The contents of the dmc.conf file is a list of device names that corre‐
69       spond to DMC scanners.  Empty lines and lines starting with a hash mark
70       (#) are ignored.  A sample configuration file is shown below:
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72              /dev/scanner
73              # this is a comment
74              /dev/sge
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FILES

77       /etc/sane.d/dmc.conf
78              The   backend   configuration  file  (see  also  description  of
79              SANE_CONFIG_DIR below).
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81       /usr/lib*/sane/libsane-dmc.a
82              The static library implementing this backend.
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84       /usr/lib*/sane/libsane-dmc.so
85              The shared library implementing this backend (present on systems
86              that support dynamic loading).
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ENVIRONMENT

89       SANE_CONFIG_DIR
90              This environment variable specifies the list of directories that
91              may contain the configuration file.  Under UNIX, the directories
92              are  separated  by a colon (`:'), under OS/2, they are separated
93              by a semi-colon (`;').  If this variable is not set, the config‐
94              uration  file is searched in two default directories: first, the
95              current working directory (".") and then in /etc/sane.d.  If the
96              value  of the environment variable ends with the directory sepa‐
97              rator character, then the default directories are searched after
98              the  explicitly  specified  directories.   For  example, setting
99              SANE_CONFIG_DIR to "/tmp/config:" would  result  in  directories
100              "tmp/config",  ".",  and  "/etc/sane.d"  being searched (in this
101              order).
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103       SANE_DEBUG_DMC
104              If the library was compiled with  debug  support  enabled,  this
105              environment  variable controls the debug level for this backend.
106              E.g., a value of 128 requests all debug output  to  be  printed.
107              Smaller levels reduce verbosity.
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BUGS

110       In  the  "Full  Frame" and "Raw" modes, images must be read in units of
111       entire lines.  The driver performs no buffering in these modes; if  you
112       ask  sane_read to read a non-integral number of lines, it may read less
113       than you ask for.  If you ask sane_read to  read  less  than  a  single
114       line, it returns SANE_STATUS_INVAL.
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116       In  the  "Super  Resolution"  mode, images must be read in units of two
117       lines (3198 pixels or 9594 bytes.)  If you try to read  less  than  two
118       lines,  you  get  SANE_STATUS_INVAL.  The Super Resolution mode is very
119       slow.
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121       In the "Viewfinder" and "Thumbnail" modes, the  entire  image  must  be
122       read in one SCSI transfer.  In this case, the driver performs buffering
123       and you can read the image in as small an increment as you like.
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SEE ALSO

126       sane(7), sane-scsi(5)
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AUTHOR

129       David F. Skoll
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131       The backend is derived from sane-hp by David Mosberger
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135sane-backends 1.0.18              13 May 1998                      sane-dmc(5)
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