sane-project-backends/doc/sane-umax_pp.man

.TH sane-umax_pp 5 "15 February 2002" "@PACKAGEVERSION@" "SANE Scanner Access Now Easy"
.IX sane-umax_pp
.SH NAME
sane-umax_pp \- SANE backend for Umax parallel port flatbed scanners
.SH DESCRIPTION
The
.B sane-umax_pp
library implements a SANE (Scanner Access Now Easy) backend that
provides access to Umax parallel port flatbed scanners.  The
following scanners work with this backend:
.PP
.RS
Model:                
.br
-------------------- 
.br
Astra 1220P         
.br
HP3200C            
.br
Astra 1600P       
.br
Astra 2000P      
.br
.RE
.PP
This backend handles 75x75, 150x150, 300x300, 600x600 and 600x1200 dpi scan
resolutions, in color and gray levels. There is a software lineart mode.
.PP
These scanners share the same ASIC. Only parts such as CCD and ADC change from
one to another. They even all reports being UMAX Astra 1220P via IEEE1284.
There isn't software way to recognize them properly. Under windows, model is
set by the driver installed, regardless of the hardware. 
.PP
.TP
.B EPP MODE ONLY
The current version of the backend use only EPP mode to communicate with the 
scanner. PS/2 and SPP mode aren't implemented. It is recommended that you set
your parallel port to EPP in BIOS with the current version of this backend. 
ECPEPP will only work if you use a 2.4 kernel with ppdev character device support.
.PP
This backend does support parport sharing only 
.I 
if you have a kernel with ppdev support.
.I 
.PP
Note that if you don't use the ppdev character device, the backend 
needs to run as root. To allow user access to the scanner
run the backend through the network interface (See saned(1) and sane\-net(5)).
A more relaxed solution (security wise) is to add suid bit to the frontend
(See chmod(1)).
The backend drop root priviledges as soon as it can, right after gaining direct
access to IO ports, which lessen risks when being root.

.SH "DEVICE NAMES"
This backend expects device names of the form:
.PP
.RS
.I port value
.RE
.PP
Where
.B value
is the base address, or the ppdev device name of the port your scanner is attached to. 
Known ports are
.B 0x378
(lp1)
.B 0x278
(lp2) and
.B 0x3BC
(lp0). Note that if you are using a Kernel 2.2.x or better , the first
parallel port is named lp0 regardless of the base address. However,
this backend requires the base address of your port. If you are not sure which
port your scanner is connected to, have a look at your /etc/modules.conf.
.PP
If you are using the linux ppdev character device, you will have to specify
the device name, which is /dev/parport0 for the first parallel port. Check 
the permissions on /dev/paraport0, many linux distributions restrict them
for root only access. Get sure they are like:
.br
crw-rw-rw- 1 root root 99, 0 mai 20 2002 /dev/parport0
.br
crw-rw-rw- 1 root root 99, 1 mai 20 2002 /dev/parport1
.br
crw-rw-rw- 1 root root 99, 2 mai 20 2002 /dev/parport2
.br
crw-rw-rw- 1 root root 99, 3 mai 20 2002 /dev/parport3
.br


You can rename any device using the
.PP
.RS
.I name devname
.br
.I model model
.br
.I vendor vendor
.RE
.PP
options. These options apply to the last port option. 

.SH CONFIGURATION
Please make sure to edit umax_pp.conf
.B before
you use the backend.
.PP
The contents of the
.B umax_pp.conf
file is a list of options and device names that correspond to Umax
scanners.  Empty lines and lines starting with a hash mark (#) are
ignored.
.PP
The height options supported are
.BR red-brightness ,
.BR green-brightness ,
.BR blue-brightness ,
.BR red-contrast ,
.BR green-contrast ,
.BR blue-contrast ,
.BR astra ,
and
.BR buffer .

Options
.B red-brightness
,
.B green-brightness
and
.B blue-brightness
allow you to adjust the sensitivy of your scanner for the given color. Values
range from 0 (lowest brightness) to 15 (highest). The "Brightness" option isn't
checked in the frontend, the backend does automatic brightness calibration.

.PP

Options
.B red-contrast
,
.B green-contrast
and
.B blue-contrast
allow you to adjust the contrast of your scanner for the given color. Values
range from 0 (lowest contrast) to 15 (highest). 
.PP

Option
.B astra
allows you to change the model of your scanner. Current auto detection is based
on side effects on scanning when using 1220P command set on other models, so
it may fail on unkown hardware combination. Valid values are 1220, 1600 
and 2000. It is usefull only autodetection fails to detect properly your scanner 
model. If your scanner work properly but is reported wrongly, let it be that way. 
The only valid case to change the model is when your scanner produces 'black' or 
 'inverted' scans.  In this case you can put the model. Be aware that it will 
prevent autodetection.
.PP

Option
.B buffer
allows you to change the size of the scan buffer. The size must be specified in
bytes. The default value is 2 megabytes. Decreasing this value will improve the
progress status reporting in the frontend, but will stall the scan more often.

.PP



.SH FILES
.TP
.I @CONFIGDIR@/umax_pp.conf
The backend configuration file (see also description of
.B SANE_CONFIG_DIR
below).
.TP
.I @LIBDIR@/libsane\-umax_pp.a
The static library implementing this backend.
.TP
.I @LIBDIR@/libsane\-umax_pp.so
The shared library implementing this backend (present on systems that
support dynamic loading).

.SH ENVIRONMENT
.TP
.B SANE_CONFIG_DIR
This environment variable specifies the list of directories that may
contain the configuration file.  Under UNIX, the directories are
separated by a colon (`:'), under OS/2, they are separated by a
semi-colon (`;').  If this variable is not set, the configuration file
is searched in two default directories: first, the current working
directory (".") and then in @CONFIGDIR@.  If the value of the
environment variable ends with the directory separator character, then
the default directories are searched after the explicitly specified
directories.  For example, setting
.B SANE_CONFIG_DIR
to "/tmp/config:" would result in directories "tmp/config", ".", and
"@CONFIGDIR@" being searched (in this order).
.TP
.B SANE_DEBUG_UMAX_PP
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.

.PP
.RS
level   debug output
.br
------- ------------------------------
.br
 0       nothing
.br
 1       errors
.br
 2       warnings & minor errors
.br
 3       additional information
.br
 4       debug information
.br
 5       code flow (not supported yet)
.br
 6       special debug information
.RE
.PP
.TP
.B SANE_DEBUG_UMAX_PP_LOW
This variable sets the debug level for the SANE interface for the Umax
ASIC. Note that enabling this will spam your terminal with some
million lines of debug output.

.PP
.RS
level   debug output
.br
------- -------------------------------
.br
 0       nothing
.br
 1       errors
.br
 8       command blocks
.br
 16      detailed code flow
.br
 32      dump datafiles      
.br
 255     everything
.RE
.PP
 
.PP
.SH "SEE ALSO"
sane(7), sane\-net(5), saned(1)

.TP
For latest bug fixes and information see
.I http://umax1220p.sourceforge.net/

.SH AUTHOR
St<EFBFBD>phane VOLTZ <svoltz@wanadoo.fr>, man page derived from mustek_pp man page
by Jochen Eisinger <jochen.eisinger@gmx.net>



.SH BUG REPORTS
If something doesn't work, please contact me. But I need some information about
your scanner to be able to help you...

.TP
.I SANE version
run "scanimage -V" to determine this
.TP
.I the backend version and your scanner hardware
run "SANE_DEBUG_UMAX=255 scanimage -L 2>log" as root. If you don't get any output
from the umax_pp backend, make sure a line "umax_pp" is included into
your @CONFIGDIR@/dll.conf.
If your scanner isn't detected, make sure you've defined the right port address
in your umax_pp.conf.
.TP
.I the name of your scanner/vendor
also a worthy information. Please also include the optical resolution and lamp type of your scanner, both can be found in the manual of your scanner.
.TP
.I any further comments
if you have comments about the documentation (what could be done better), or you
think I should know something, please include it.