sane-cardscan - SANE backend for Corex CardScan usb scanners


   The  sane-cardscan  library implements a SANE (Scanner Access Now Easy)
   backend which provides access to the Corex CardScan 800c & 600c  small-
   format scanners.

   The  backend  supports  only  grayscale  and  color  modes and media of
   (theoretically) infinite length.

   This backend may support other scanners.  The  best  way  to  determine
   level of support is to get a trace of the windows driver in action, and
   send it to the author.


   The cardscan backend supports the following options:

   mode m
          Selects the mode for the scan. Options are "Gray" and "Color".


   The configuration file "cardscan.conf" is used to tell the backend  how
   to  look for scanners, and provide options controlling the operation of
   the backend.  This file is read each time the frontend asks the backend
   for a list of scanners, generally only when the frontend starts. If the
   configuration file is missing, the backend will use a set  of  compiled
   defaults, which are identical to the default configuration file shipped
   with SANE.

   Scanners can be specified in the configuration file in 2 ways:

   "usb 0x04c5 0x1042" (or other vendor/product ids)
          Requests backend to search all usb busses in the  system  for  a
          device  which  uses  that vendor and product id. The device will
          then be queried to determine if it is a cardscan scanner.

   "usb /dev/usb/scanner0" (or other device file)
          Some systems use a kernel driver to access  usb  scanners.  This
          method is untested.

   Additionally,  there  are  two  configuration  options that control the
   protocol used by the backend:

   "lines_per_block 16" (or other number from 1 to 32)
          Controls the number  of  lines  of  image  data  which  will  be
          acquired  in each pass.  Older scanners will require this number
          set lower, often 1.

   "has_cal_buffer 1" (1 or 0)
          Causes the backend to get calibration data from  scanner  during
          initialization.  Older scanners do not support this request, and
          must be set to 0.


   The backend uses a single  environment  variable,  SANE_DEBUG_CARDSCAN,
   which enables debugging output to stderr. Valid values are:

          5  Errors
          10 Function trace
          15 Function detail
          20 Option commands
          25 SCSI/USB trace
          30 SCSI/USB detail
          35 Useless noise


          The  scanner does not seem to have much control possible, so the
          backend cannot set  x/y  coordinate  values,  resolutions,  etc.
          These  things  could  be simulated in the backend, but there are
          plenty of command line tools.
          The backend also does not send all the commands that the windows
          driver does, so it may not function the same.
          The backend does not have the calibration or ejection options of
          the windows driver.


   The hardware to build this driver was provided to the author by:
     Jeff Kowalczyk <jtk a t yahoo d o t com>


   sane(7), sane-usb(5)


   m. allan noah: <kitno455 a t gmail d o t com>

                              10 Feb 2010                 sane-cardscan(5)


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