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sane-apple(5)									    sane-apple(5)

       sane-apple - SANE backend for Apple flatbed scanners

       The  sane-apple	library implements a SANE (Scanner Access Now Easy) backend that provides
       access to Apple flatbed scanners. At present, the following scanners  are  supported  from
       this backend:

       --------------- ----- ------------------ ------
       AppleScanner    4bit  16 Shades of Gray
       OneScanner      8bit  256 Shades of Gray
       ColorOneScanner 24bit RGB color		3-pass

       If  you own a Apple scanner other than the ones listed above that works with this backend,
       please let us know by sending the scanner's model name, SCSI id, and firmware revision  to
       sane-devel@mostang.com.	 See  http://www.mostang.com/sane/mail.html for details on how to
       subscribe to sane-devel.

       This backend expects device names of the form:


       Where special is either the path-name for the special device that corresponds  to  a  SCSI
       scanner.  For  SCSI  scanners,  the special device name must be a generic SCSI device or a
       symlink to such a device.  Under Linux, such a device name could be /dev/sga or	/dev/sge,
       for example.  See sane-scsi(5) for details.

       The  contents of the apple.conf file is a list of options and device names that correspond
       to Apple scanners.  Empty lines and lines starting with a hash mark (#) are ignored.   See
       sane-scsi(5) on details of what constitutes a valid device name.

       Options	come  in  two  flavors:  global and positional ones.  Global options apply to all
       devices managed by the backend whereas positional options apply just to the most  recently
       mentioned  device.   Note  that this means that the order in which the options appear mat-

       SCSI scanners are typically delivered with  an  ISA  SCSI  adapter.   Unfortunately,  that
       adapter is not worth much since it is not interrupt driven.  It is (sometimes) possible to
       get the supplied card to work, but without interrupt line, scanning will put so much  load
       on the system, that it becomes almost unusable for other tasks.

	      The backend configuration file (see also description of SANE_CONFIG_DIR below).

	      The static library implementing this backend.

	      The  shared  library  implementing  this	backend  (present on systems that support
	      dynamic loading).

	      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 /etc/sane.d.	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
	      SANE_CONFIG_DIR  to  "/tmp/config:"  would result in directories "tmp/config", ".",
	      and "/etc/sane.d" being searched (in this order).

	      If the library was compiled with debug support enabled, this  environment  variable
	      controls the debug level for this backend.  E.g., a value of 255 requests all debug
	      output to be printed.  Smaller levels reduce verbosity.

       The apple backend is now in version 0.3 (Tue Jul 21 1998). Since I only have  the  AppleS-
       canner  and not the other models (OneScanner, ColorOneScanner) I can only develop/test for
       the AppleScanner effectively.  However with this release I almost complete the gui part of
       all  scanners.  Most of the functionality is there. At least OneScanner should scan at the
       AppleScanner's compatible modes (LineArt, HalfTone, Gray16). My personal  belief  is  that
       with  a	slight touch of debugging the OneScanner could be actually usable. The ColorOneS-
       canner needs more work. AppleScanner is of course almost fully supported.

       Currently all 3 models are lacking upload/dowload support.

	      Cannot up/download a halftone pattern.

	      Cannot up/download halftone pattern and calibration vector.

	      Cannot up/download halftone pattern, calibration vectors, custom	Color  Correction
	      Table (CCT) and of course custom gamma tables.

       Park/UnPark (OneScanner, ColorOneScanner)

       The  above functionalities are not only missing because I don't actually have the hardware
       to experiment on it. Another reason is the lack of understanding of  how  SANE  API  could
       provide enaugh means to me to actually describe other array types than the gamma one.

       The  following  "features" will never be supported. At least as I am maintaining the sane-
       apple backend.

       NoHome (AppleScanner)
	      The scanner lamp stays on and the carriage assembly remains where it stops  at  the
	      end  of  the  scan. After two minutes, if the scanner does not receive another SCAN
	      command the lamp goes off and the carriage returns to the home position.

       Compression (AppleScanner)
	      The Scanner can compress data with  CCITT  Group	III,  one  dimensional	algorithm
	      (fax), and the Skip White Line algorithm.

       Multiple Windows (AppleScanner)
	      AppleScanner  may  support multiple windows. It would be a cool feature and a chal-
	      lenge for me to code it if you could intermix different options for different  win-
	      dows  (scan areas). This way you could scan a document in LineArt mode but the fig-
	      ures in it on Gray and in a different resolution.  Unfortunately this  is  impossi-

       Scan Direction (OneScanner)
	      It controls the scan direction. (?)

       Status/Reset Button (OneScanner)
	      This  option  controls  the  status of the button in OneScanner model. You can also
	      reset the button status by software.

       The bugs in a sane backend are divided in two classes. We have GUI bugs and  scanner  spe-
       cific bugs.

       We  know  we  have  a  GUI  bug	when  a parameter is not showing up itself when it should
       (active) or vice versa. To find out which parameters  are  active  accross  various  Apple
       modes  and  models  from  the  documentation  ftp://ftpdev.info.apple.com/devworld/Techni-
       cal_Documentation/Peripherals_Documentation/ is an interesting exercise. I may missed some
       dependancies. For example for the threshold parameter the Apple Scanners Programming guide
       says nothing. I had to assume that is valid only in LineArt mode.

       Scanner specific bugs are mostly due to mandatory round offs in order to scan. In the doc-
       umentation in some place states that the width of the scan area should be a byte multiple.
       In an other place says that the width of the scan area should be an even byte multiple. Go

       Other  source of bugs are due to scsi communcation, scsi connects and disconnects. However
       the classical bugs are still there. So you may encouter buffer  overruns,  null	pointers,
       memory corruption and SANE API violations.

       SIGSEGV on SliceBars
	      When you try to modify the scan area from the slice bar you have a nice little cute
	      core dump. I don't know why. If you select the scan are from the preview window, or
	      by  hand	typing	the  numbers  everything is fine. The SIGSEGV happens deep in gtk
	      library (gdk). I really cannot debug it.

       Options too much
	      It is possible, especially for the  ColorOneScanner,  that  the  backend's  options
	      panel to exceed from your screen. It happens with mine and I am running at 1024x768
	      my X Server. What can I say? Try smaller fonts in the X server, or virtual screens.

       Weird SCSI behaviour.
	      I am quoting David Myers Here...

	      >> OS: FreeBSD 2.2.6

	      >> CC: egcs-1.02

	      >Just wanted to follow up on this...  I recently changed my SCSI card from

	      >the Adaptec 2940UW to a dual-channel Symbios 786 chipset.  When I started up

	      >SANE with your driver, I managed to scan line art drawings okay, but Gray16

	      >scans led to a stream of SCSI error messages on the console, ultimately

	      >hanging with a message saying the scanner wasn't releasing the SCSI bus.

	      >This may be that the Symbios is simply less tolerant of ancient

	      >hardware, or may be bugs in your driver or in SANE itself...

       If you encounter a GUI bug please set the environment variable SANE_DEBUG_APPLE to 255 and
       rerun  the excact sequence of keystrokes and menu selections to reproduce it. Then send me
       a report with the log attached.

       It would be very helpfull if you have handy an Apple machine (I am not  sure  how  Mackin-
       toshs  are  spelled)  with  the	AppleScanners  driver installed and check what option are
       grayed out (inactive) in what modes and report back to me.

       If you want to offer some help but you don't have a scanner or you don't  have  the  model
       you would like to offer some help, or you are a sane developer and you just want to take a
       look at how the apple backend looks like. Goto to apple.h and #define the NEUTRALIZE_BACK-
       END  macro.  You can select the scanner model through the APPLE_MODEL_SELECT macro. Avail-

       If you encounter a SCSI bus error or trimmed and/or displaced images please also  set  the
       environment variable SANE_DEBUG_SANEI_SCSI to 255 before sendme the report.

       Non Blocking Support
	      Make  sane-apple	a non blocking backend. Properly support for sane_set_io_mode and

       Scan   Make scan possible for all models in all supported modes.

       Missing Functionality.

       sane(7), sane-scsi(5)

       The sane-apple backend was written not entirely from  scratch  by  Milon  Firikis.  It  is
       mostly based on the mustek backend from David Mosberger and Andreas Czechanowski

					   13 May 1998				    sane-apple(5)
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