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       sane-umax - SANE backend for UMAX scanners


       This  file only is a short descripton of the umax-backend for sane! For
       detailled information take a look at sane-umax-doc.html (it is included
       in the sane source directory and in the xsane online help)!


       The  sane-umax library implements a SANE backend that provides acces to
       several  UMAX-SCSI-scanners  and  some  Linotye   Hell   SCSI-scanners,
       parallel-  and  USB-scanners  are  not  (and  propably  will  never be)

       I suggest you hold one hand on the power-button of  the  scanner  while
       you try the first scans!


       The    configuration    file    for    this    backend    resides    in

       Its contents is a list of device names that correspond to UMAX and UMAX
       compatible  scanners.  Empty  lines and lines starting with a hash mark
       (#) are ignored. A sample configuration file is shown below:

        # this is a comment
        option scsi-maxqueue 4
        option scsi-buffer-size-min 65536
        option scsi-buffer-size-max 131072
        option scan-lines 40
        option preview-lines 10
        option scsi-maxqueue 2
        option execute-request-sense 0
        option force-preview-bit-rgb 0
        option slow-speed -1
        option care-about-smearing -1
        option calibration-full-ccd -1
        option calibration-width-offset -1
        option calibration-bytes-pixel -1
        option exposure-time-rgb-bind -1
        option invert-shading-data -1
        option lamp-control-available 0
        option gamma-lsb-padded 0

        #scsi Vendor Model Type Bus Channel ID LUN
        # The following scanner supports lamp control
        option lamp-control-available 1
        scsi UMAX * Scanner * * * * *

        # scanner on /dev/scanner does not support lamp control
        option lamp-control-available 0

              values: 0 = disabled, 1 = enabled
              default = 0
              If   set   to   1    umax_do_request_sense    is    called    in
              umax_do_calibration.  This  can  hang  the  system (but has been
              enabled until this version)

       scsi-buffer-size-min, scsi-buffer-size-max:
              values: 4096-1048576
              default min = 32768, max = 131072
              Especially the minimum value is very important.  If  this  value
              is set too small the backend is not able to send gamma tables to
              the scanner or to do  a  correct  color  calibration.  This  may
              result in strange color effects. If the minimum value is set too
              large then the backend is not able  to  allocate  the  requested
              scsi  buffer  size  and  aborts  with  out  of memory error. The
              default is 32KB, for some scanners it  should  be  increased  to

       scan-lines, preview-lines:
              values: 1-65535
              default: scan-lines = 40, preview-lines = 10
              define  the  maximum  number  of lines that are scanned into one

              values: 0 = disabled, 1 = enabled
              default = 0
              set preview bit in rgb real scan

       slow-speed, care-about-smearing:
              values: -1 = auto, 0 = disabled, 1 = enabled
              default = -1
              dangerous options, needed for some scanners do not changed these
              options  until you really know what you do, you may destroy your
              scanner when you define wrong values for this options

              values: -1 = auto, 0 = disabled, 1 = enabled
              default = -1
              do calibration for each pixel of ccd instead of selected image

              values: -99999 = auto, > -99999 set value
              add an offset width to the calculated with for image/ccd

              values: -1 = disabled, 0 = not set, 1 =  1  byte/pixel,  2  =  2
              use # bytes per pixel for calibration

              values:  -1  =  automatically  set  by  driver  -  if known, 0 =
              disabled (own selection for red, green and blue),  1  =  enabled
              (same values for red, green and blue)

              values:  -1  =  automatically  set  by  driver  -  if known, 0 =
              disabled, 1 = enabled
              default = -1
              invert shading data before sending it back to the scanner

              values: 0 =  automatically  set  by  driver  -  if  known,  1  =
              default = 0

              values:  -1  = automatically set by driver - if known, 0 = gamma
              data is msb padded, 1 = gamma data is lsb padded
              default = -1

              values: 0 = handle as device busy, 1 = handle as ok, 2 =  handle
              as i/o error, 3 = ignore bad error code - continue sense handler
              default = 0

              values: 1..# (maximum defined at compile time)
              default = 2
              most scsi drivers allow internal command queueing with  a  depth
              of  2  commands.  In most cases it does not mprove anything when
              you increase this value. When your scsi driver does not  support
              any command queueing you can try to set this value to 1.

       The  special  device name must be a generic SCSI device or a symlink to
       such a device.  To find out to which device your  scanner  is  assigned
       and  how you have to set the permissions of that device, have a look at


       The ISA-SCSI-adapters that are shipped with some Umax-scanners are  not
       supported  very  well by Linux (I suggest not to use it), the PCI-SCSI-
       adapters that come with some Umax-scanners are not supported at all (as
       far  as  I  know).  On  other  platforms  these  SCSI-adapters  are not
       supported. So you typically need to purchase another SCSI-adapter  that
       is  supported  by  your  platform.  See  the relevant hardware FAQs and
       HOWTOs for your platform for more information.

       The UMAX-scanners do  block  the  scsi-bus  for  a  few  seconds  while
       scanning.  It  is not necessary to connect the scanner to its own SCSI-
       adapter. But if you need short response  time  for  your  SCSI-harddisk
       (e.g.  if  your  computer  is  a  file-server) or other scsi devices, I
       suggest you use an own SCSI-adapter for your UMAX-scanner.

       If you have any problems with your Umax scanner, check your scsi  chain
       (cable length, termination, ...).

       See also: sane-scsi(5)


       The backend configuration file:

       The static library implementing this backend:

       The shared library implementing this backend:
              /usr/lib/sane/  (present  on systems that support
              dynamic loading)


              If the library was compiled with  debug  support  enabled,  this
              environment  variable controls the debug level for this backend.
              E.g., a value of 128 requests all debug output  to  be  printed.
              Smaller levels reduce verbosity: SANE_DEBUG_UMAX values

              Number  Remark

               0       print important errors (printed each time)
               1       print errors
               2       print sense
               3       print warnings
               4       print scanner-inquiry
               5       print informations
               6       print less important informations
               7       print called procedures
               8       print reader_process messages
               10      print called sane-init-routines
               11      print called sane-procedures
               12      print sane infos
               13      print sane option-control messages

              export SANE_DEBUG_UMAX=8


       X-resolutions greater than 600 dpi sometimes make problems




       Oliver Rauch



                                  14 Jul 2008                     sane-umax(5)