NAME

       sane-cardscan - SANE backend for Corex CardScan usb scanners

DESCRIPTION

       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.

OPTIONS

       The cardscan backend supports the following options:

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

CONFIGURATION FILE

       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  aquired  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.

ENVIRONMENT

       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

KNOWN ISSUES

              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.

CREDITS

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

SEE ALSO

       sane(7), sane-usb(5)

AUTHOR

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

                                           10 Feb 2010                           sane-cardscan(5)