sane-dmc(5)

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

Description

sane-dmc implements a SANE (Scanner Access Now Easy) backend that provides access to the Polaroid Digital Microscope Camera.

sane-dmc 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 symbolic link to such a device.

The Polaroid DMC supports a number of imaging modes. sane-dmc supports:

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 greyscale 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 greyscale, 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.
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 between ``Daylight'', ``Incandescent'' or ``Fluorescent'' white balances. This setting corresponds to the ``Color Temperature'' settings on Polaroid's Windows and Macintosh software.

dmc.conf contains a list of device names that correspond to DMC scanners. Empty lines and lines starting with a hash (``#'') are ignored. A sample configuration file is shown below:

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

The SANE_CONFIG_DIR environment variable specifies the list of directories that may contain the configuration file. The directories are separated by a colon (``:''). If this variable is not set, the configuration file is searched in two default directories: firstly, the current working directory (``.'') and then in /usr/local/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 /usr/local/etc/sane.d being searched (in this order).

The SANE_DEBUG_DC25 environment variable controls the debug level for the sane-dc25 backend if the library was compiled with debugging support enabled. A value of 128 requests full debug output; smaller levels reduce verbosity.

Files

/usr/local/etc/sane.d/dmc.conf: The backend configuration file (see the description of SANE_CONFIG_DIR).
/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).

Notices

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.

Author is David F Skoll.

References

sane-abaton(5), sane-agfafocus(5), sane-apple(5), saned(1), sane-dc25(5), sane-dll(5), sane-epson(5), sane-hp(5), sane-microtek(5), sane-microtek2(5), sane-mustek(5) sane-net(5), sane-pint(5), sane-pnm(5), sane-umax(5), scanimage(1), xsane(1), xscanimage(1)