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sane-canon_pp(5)	 SANE Scanner Access Now Easy	      sane-canon_pp(5)

NAME
       sane-canon_pp  -	 SANE backend for Canon CanoScan Parallel Port flatbed
       scanners

DESCRIPTION
       The sane-canon_pp library implements a SANE (Scanner Access  Now	 Easy)
       backend that provides access to the following Canon flatbed scanners:

	      CanoScan FB320P
	      CanoScan FB620P
	      CanoScan FB330P
	      CanoScan FB630P
	      CanoScan N340P
	      CanoScan N640P
	      CanoScan N640P ex

       No USB scanners are supported and there are no plans to support them in
       the future.  Other projects are working on support  for	USB  scanners.
       See  the	 PROJECTS file for more detail.	 The FB310P and FB610P are re-
       badged Avision scanners which use  a  different	command	 set,  so  are
       unlikely to be supported by this backend in the future.

       IMPORTANT:  this is alpha code. While we have made every effort to make
       it as reliable as possible, it will not always work as expected.	 Feed‐
       back  is	 still	appreciated.  Please send any bug reports to the main‐
       tainers as listed on the web page (listed in SEE ALSO below).

DEVICE NAMES
       This backend expects device names of the form presented by libieee1284.
       These names are highly dependent on operating system and version.

       On  Linux  2.4  kernels this will be of the form parport0 or older (2.2
       and before) kernels may produce names like 0x378 (the base  address  of
       your  port)  or simply 0 depending on your module configuration.	 Check
       the contents of /proc/parport if it exists.  If you don't want to spec‐
       ify a default port (or don't know its name), the backend should be able
       to detect which port your scanner is on.

CONFIGURATION
       The contents of the canon_pp.conf file is a list	 of  options  for  the
       driver to use.  Empty lines and lines starting with a hash mark (#) are
       ignored.

       The supported options are currently ieee1284, calibrate, init_mode, and
       force_nibble

       Option  ieee1284	 port-name  defines  which port to use.	 The format of
       port-name is OS dependent, based on the names presented by libieee1284.
       Please only have one of these lines, or all but one will be ignored.

       Option calibrate cal-file [port-name] defines which calibration file to
       use on a per-port basis.	 If you only have one parport,	the  port-name
       argument may be omitted - but be careful as this will cause problems on
       multi-scanner systems.  You may have as many  of	 these	lines  as  you
       like,  as long as each has a unique port name.  The tilde (`~') charac‐
       ter is acceptable and will be expanded to the value of the  HOME	 envi‐
       ronment.

       Option init_mode <AUTO|FB620P|FB630P> [portname] defines which initial‐
       isation (wake-up) mode to use on a per-port basis.  If  you  only  have
       one  parport,  the portname argument may be omitted - but be careful as
       this may cause problems on multi-scanner systems.  You may have as many
       of  these  lines	 as  you like, as long as each has a unique port name.
       The valid initialisation modes are FB620P (which strobes	 10101010  and
       01010101 on the data pins), FB630P (which strobes 11001100 and 00110011
       on the data pins) and AUTO, which  will	try  FB630P  mode  first  then
       FB620P  mode  second.  The FB620P mode is also used by the FB320P.  The
       FB630P mode is used by the FB330P, N340P, and N640P.

       Option force_nibble forces the driver to use nibble mode	 even  if  ECP
       mode  is	 reported  to work by libieee1284.  This works-around the rare
       issue of ECP mode being reported to work by the library, then not work‐
       ing.

TIPS
       Hit  the	 "Calibrate"  button  before scanning.	It vastly improves the
       quality of scans.

       To enable automatic detection of your scanner, uncomment the "canon_pp"
       line from /etc/sane.d/dll.conf

FILES
       /etc/sane.d/canon_pp.conf
	      The   backend   configuration  file  (see	 also  description  of
	      SANE_CONFIG_DIR below).

       /usr/lib*/sane/libsane-canon_pp.a
	      The static library implementing this backend.

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

ENVIRONMENT
       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 config‐
	      uration  file is searched in two default directories: first, the
	      current working directory (".") and then in /etc/sane.d.	If the
	      value  of the environment variable ends with the directory sepa‐
	      rator character, then the default directories are searched after
	      the  explicitly  specified  directories.	 For  example, setting
	      SANE_CONFIG_DIR to "/tmp/config:" would  result  in  directories
	      "tmp/config",  ".",  and	"/etc/sane.d"  being searched (in this
	      order).

       SANE_DEBUG_CANON_PP
	      If the library was compiled with	debug  support	enabled,  this
	      environment  variable controls the debug level for this backend.
	      Higher debug levels increase the verbosity of the output.

	      Example: export SANE_DEBUG_CANON_PP=4

NOTES
       Features available in the Windows interface

       Brightness and Contrast
	      These are not implemented, and probably never  will  be.	 These
	      appear  to  be  implemented entirely in software.	 Use GIMP or a
	      similar program if you need these features.

       Descreen Mode
	      This appears on our first analysis to be just oversampling  with
	      an  anti-aliasing	 filter.   Again,  it  seems to be implemented
	      entirely in software, so GIMP is your best bet for now.

       Gamma Tables
	      This is under investigation, but for now	only  a	 simple	 gamma
	      profile  (ie:  the  one  returned	 during	 calibration)  will be
	      loaded.

       Communication Problems

       ECP mode in libieee1284 doesn't always work  properly,  even  with  new
       hardware.   We believe that this is a ppdev problem.  If you change the
       configuration file to include force_nibble , the problem will go	 away,
       but you will only be able to scan in nibble mode.

       Sometimes  the  scanner	can  be	 left in a state where our code cannot
       revive it.  If the backend reports no scanner present,  try  unplugging
       the  power  and plugging it back in.  Also try unplugging printers from
       the pass-through port.

       The scanner will not respond correctly to our commands when  you	 first
       plug  in	 the  power.   You  may find if you try a scan very soon after
       plugging in the power that the backend will incorrectly report that you
       have  no	 scanner  present.  To avoid this, give it about 10 seconds to
       reset itself before attempting any scans.

       Repeated Lines

       Sometimes at high resolutions (ie. 600dpi) you will notice lines	 which
       appear  twice.  These lines correspond to points where the scanner head
       has stopped during the scan (it stops every time the internal 64kb buf‐
       fer  is full).  Basically it's a mechanical problem inside the scanner,
       that the tolerance of movement for a start/stop event is	 greater  than
       1/600  inches.  I've never tried the windows driver so I'm not sure how
       (or if) it works around this problem, but  as  we  don't	 know  how  to
       rewind  the  scanner  head to do these bits again, there's currently no
       nice way to deal with the problem.

       Grey-scale Scans

       Be aware that the scanner uses the green LEDs to read grey-scale scans,
       meaning	green coloured things will appear lighter than normal, and red
       and blue coloured items will appear darker than normal.	For high-accu‐
       racy grey-scale scans of colour items, it's best just to scan in colour
       and convert to grey-scale in graphics software such as the GIMP.

       FB620P/FB320P Caveats

       These models can not be reset in the same way as the others.  The  win‐
       dows  driver  doesn't know how to reset them either - when left with an
       inconsistent scanner, it will start scanning half way down the page!

       Aborting is known to work correctly on the FB*30P models, and is	 known
       to be broken on the FB*20P models.  The FB620P which I tested on simply
       returns garbage after a scan has been aborted using the method we know.
       Aborting	 is  able to leave the scanner in a state where it can be shut
       down, but not where another scan can be made.

SEE ALSO
       sane(7), sane-dll(5)  http://canon-fb330p.sourceforge.net/

AUTHOR
       This backend is primarily the work of Simon Krix (Reverse Engineering),
       and Matthew Duggan (SANE interface).

       Many thanks to Kevin Easton for his comments and help, and Kent A. Sig‐
       norini for his help with the N340P.

sane-backends 1.0.18		1 October 2002		      sane-canon_pp(5)
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