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 Gray|Color
              Selects the mode for the scan.

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 buses 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.

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)