sane-umax



ABOUT THIS FILE
       This file only is a short description of the 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 online help)!


DESCRIPTION
       The sane-umax library implements a SANE backend that provides access to
       several UMAX-SCSI-scanners and some Linotye Hell SCSI-scanners,  paral-
       lel- 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 scans!


CONFIGURATION
       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
        /dev/sge

        #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
        /dev/scanner
              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

       force-preview-bit-rgb:
              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

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

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

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

       exposure-time-rgb-bind:
              values: -1 = automatically set by driver - if known,  0  =  dis-
              abled (own selection for red, green and blue), 1 = enabled (same
              values for red, green and blue)

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

       lamp-control-available:
              values:  0  = automatically set by driver - if known, 1 = avail-

       scsi-maxqueue:
              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
       sane-scsi.


SCSI ADAPTER TIPS
       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 sup-
       ported. 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  scan-
       ning.  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 sug-
       gest 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)


FILES
       The backend configuration file:
              /etc/sane.d/umax.conf

       The static library implementing this backend:
              /usr/lib/arch_triplet/sane/libsane-umax.a

       The shared library implementing this backend:
              /usr/lib/arch_triplet/sane/libsane-umax.so  (present  on systems
              that support dynamic loading)


ENVIRONMENT
       SANE_DEBUG_UMAX
              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.
               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


       Example:
              export SANE_DEBUG_UMAX=8


BUGS
       X-resolutions greater than 600 dpi sometimes make problems


SEE ALSO
       sane(7)


AUTHOR
       Oliver Rauch


EMAIL-CONTACT
       Oliver.Rauch@Rauch-Domain.DE



                                  14 Jul 2008                     sane-umax(5)
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