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)!
DESCRIPTION
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) 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
execute-request-sense:
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
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 = disabled (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 = disabled,
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 = available
default = 0
gamma-lsb-padded:
values:
-1 = automatically set by driver - if known,
0 = gamma data is msb padded,
1 = gamma data is lsb padded
default = -1
handle-bad-sense-error:
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
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 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, ...).
/usr/lib/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. 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
Example:
export SANE_DEBUG_UMAX=8
BUGS
X-resolutions greater than 600 dpi sometimes make problems
