Provided by: libsane-common_1.1.1-5ubuntu1_all bug


       sane-umax - SANE backend for UMAX scanners


       This  file  is  only  a  brief description of the sane-umax backend for SANE! For detailed
       information take a look at sane-umax-doc.html (it is included in the sane source directory
       and in the xsane(1) online help)!


       The sane-umax library implements a SANE backend that provides access to several UMAX-SCSI-
       scanners and some Linotype Hell SCSI-scanners, parallel- and  USB-scanners  are  not  (and
       probably will never be) supported!

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


       The configuration file for this backend resides in /etc/sane.d/umax.conf.

       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 64KB.

       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 buffer

              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 change these options unless you really know what you are doing otherwise you
              may destroy your scanner with invalid values.

              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 to the calculated width for image/ccd

              values: -1 = disabled, 0 = not set, 1 = 1 byte/pixel, 2 = 2 bytes/pixel
              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 = available
              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 improve anything when you increase this value. When your
              SCSI driver does not support any command queueing you can try to set this value  to

       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 sane-scsi(5).


       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/x86_64-linux-gnu/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 information
               6       print less important information
               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 cause problems.


       sane(7), sane-scsi(5)


       Oliver Rauch



                                           14 Jul 2008                               sane-umax(5)