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295 wiersze
13 KiB
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<TITLE>sane-apple.5</TITLE>
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<BODY BGCOLOR=#FFFFFF TEXT=#000000><H1 ALIGN=CENTER><IMG SRC="/images/sane.png" HEIGHT=117 WIDTH=346></H1>
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<H1>sane-apple.5</H1>
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<HR>
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<PRE>
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<!-- Manpage converted by man2html 3.0.1 -->
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<B><A HREF="sane-apple.5.html">sane-apple(5)</A></B> SANE Scanner Access Now Easy <B><A HREF="sane-apple.5.html">sane-apple(5)</A></B>
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</PRE>
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<H2>NAME</H2><PRE>
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sane-apple - SANE backend for Apple flatbed scanners
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</PRE>
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<H2>DESCRIPTION</H2><PRE>
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The <B>sane-apple</B> library implements a SANE (Scanner Access Now Easy)
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backend that provides access to Apple flatbed scanners. At present, the
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following scanners are supported from this backend:
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--------------- ----- ------------------ ------
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AppleScanner 4bit 16 Shades of Gray
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OneScanner 8bit 256 Shades of Gray
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ColorOneScanner 24bit RGB color 3-pass
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If you own a Apple scanner other than the ones listed above that works
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with this backend, please let us know by sending the scanner's model
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name, SCSI id, and firmware revision to
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<I>sane-devel@lists.alioth.debian.org</I>. See
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http://www.sane-project.org/mailing-lists.html for details on how to
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subscribe to sane-devel.
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</PRE>
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<H2>DEVICE NAMES</H2><PRE>
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This backend expects device names of the form:
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<I>special</I>
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Where <I>special</I> is either the path-name for the special device that cor-
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responds to a SCSI scanner. For SCSI scanners, the special device name
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must be a generic SCSI device or a symlink to such a device. Under
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Linux, such a device name could be <I>/dev/sga</I> or <I>/dev/sge</I>, for example.
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See <B><A HREF="sane-scsi.5.html">sane-scsi(5)</A></B> for details.
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</PRE>
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<H2>CONFIGURATION</H2><PRE>
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The contents of the <I>apple.conf</I> file is a list of options and device
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names that correspond to Apple scanners. Empty lines and lines start-
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ing with a hash mark (#) are ignored. See <B><A HREF="sane-scsi.5.html">sane-scsi(5)</A></B> on details of
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what constitutes a valid device name.
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Options come in two flavors: global and positional ones. Global
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options apply to all devices managed by the backend whereas positional
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options apply just to the most recently mentioned device. Note that
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this means that the order in which the options appear matters!
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</PRE>
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<H2>SCSI ADAPTER TIPS</H2><PRE>
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SCSI scanners are typically delivered with an ISA SCSI adapter. Unfor-
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tunately, that adapter is not worth much since it is not interrupt
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driven. It is (sometimes) possible to get the supplied card to work,
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but without interrupt line, scanning will put so much load on the sys-
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tem, that it becomes almost unusable for other tasks.
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</PRE>
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<H2>FILES</H2><PRE>
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<I>/usr/local/etc/sane.d/apple.conf</I>
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The backend configuration file (see also description of
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<B>SANE_CONFIG_DIR</B> below).
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<I>/usr/local/lib/sane/libsane-apple.a</I>
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The static library implementing this backend.
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<I>/usr/local/lib/sane/libsane-apple.so</I>
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The shared library implementing this backend (present on systems
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that support dynamic loading).
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</PRE>
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<H2>ENVIRONMENT</H2><PRE>
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<B>SANE_CONFIG_DIR</B>
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This environment variable specifies the list of directories that
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may contain the configuration file. Under UNIX, the directories
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are separated by a colon (`:'), under OS/2, they are separated
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by a semi-colon (`;'). If this variable is not set, the config-
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uration file is searched in two default directories: first, the
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current working directory (".") and then in
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/usr/local/etc/sane.d. If the value of the environment variable
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ends with the directory separator character, then the default
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directories are searched after the explicitly specified directo-
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ries. For example, setting <B>SANE_CONFIG_DIR</B> to "/tmp/config:"
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would result in directories "tmp/config", ".", and
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"/usr/local/etc/sane.d" being searched (in this order).
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<B>SANE_DEBUG_APPLE</B>
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If the library was compiled with debug support enabled, this
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environment variable controls the debug level for this backend.
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E.g., a value of 255 requests all debug output to be printed.
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Smaller levels reduce verbosity.
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</PRE>
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<H2>CURRENT STATUS</H2><PRE>
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The apple backend is now in version 0.3 (Tue Jul 21 1998). Since I only
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have the AppleScanner and not the other models (OneScanner, ColorOneS-
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canner) I can only develop/test for the AppleScanner effectively. How-
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ever with this release I almost complete the gui part of all scanners.
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Most of the functionality is there. At least OneScanner should scan at
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the AppleScanner's compatible modes (LineArt, HalfTone, Gray16). My
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personal belief is that with a slight touch of debugging the OneScanner
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could be actually usable. The ColorOneScanner needs more work. AppleS-
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canner is of course almost fully supported.
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</PRE>
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<H2>MISSING FUNCTIONALITY</H2><PRE>
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Currently all 3 models are lacking upload/dowload support.
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<B>AppleScanner</B>
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Cannot up/download a halftone pattern.
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<B>OneScanner</B>
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Cannot up/download halftone pattern and calibration vector.
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<B>ColorOneScanner</B>
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Cannot up/download halftone pattern, calibration vectors, custom
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Color Correction Table (CCT) and of course custom gamma tables.
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<B>Park/UnPark</B> <B>(OneScanner,</B> <B>ColorOneScanner)</B>
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The above functionalities are not only missing because I don't actually
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have the hardware to experiment on it. Another reason is the lack of
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understanding of how SANE API could provide enaugh means to me to actu-
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ally describe other array types than the gamma one.
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</PRE>
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<H2>UNSUPPORTED FEATURES.</H2><PRE>
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The following "features" will never be supported. At least as I am
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maintaining the sane-apple backend.
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<B>NoHome</B> <B>(AppleScanner)</B>
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The scanner lamp stays on and the carriage assembly remains
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where it stops at the end of the scan. After two minutes, if the
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scanner does not receive another SCAN command the lamp goes off
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and the carriage returns to the home position.
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<B>Compression</B> <B>(AppleScanner)</B>
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The Scanner can compress data with CCITT Group III, one dimen-
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sional algorithm (fax), and the Skip White Line algorithm.
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<B>Multiple</B> <B>Windows</B> <B>(AppleScanner)</B>
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AppleScanner may support multiple windows. It would be a cool
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feature and a challenge for me to code it if you could intermix
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different options for different windows (scan areas). This way
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you could scan a document in LineArt mode but the figures in it
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on Gray and in a different resolution. Unfortunately this is
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impossible.
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<B>Scan</B> <B>Direction</B> <B>(OneScanner)</B>
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It controls the scan direction. (?)
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<B>Status/Reset</B> <B>Button</B> <B>(OneScanner)</B>
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This option controls the status of the button in OneScanner
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model. You can also reset the button status by software.
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</PRE>
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<H2>BUGS</H2><PRE>
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The bugs in a sane backend are divided in two classes. We have <B>GUI</B> bugs
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and <B>scanner</B> <B>specific</B> bugs.
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We know we have a GUI bug when a parameter is not showing up itself
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when it should (active) or vice versa. To find out which parameters are
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active accross various Apple modes and models from the documentation
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<B>ftp://ftpdev.info.apple.com/devworld/Technical_Documentation/Peripher-</B>
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<B>als_Documentation/</B> is an interesting exercise. I may missed some depen-
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dancies. For example for the threshold parameter the Apple Scanners
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Programming guide says nothing. I had to assume that is valid only in
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LineArt mode.
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Scanner specific bugs are mostly due to mandatory round offs in order
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to scan. In the documentation in some place states that the width of
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the scan area should be a byte multiple. In an other place says that
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the width of the scan area should be an even byte multiple. Go fig-
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ure...
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Other source of bugs are due to scsi communcation, scsi connects and
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disconnects. However the classical bugs are still there. So you may
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encouter buffer overruns, null pointers, memory corruption and <B>SANE</B> API
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violations.
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<B>SIGSEGV</B> <B>on</B> <B>SliceBars</B>
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When you try to modify the scan area from the slice bar you have
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a nice little cute core dump. I don't know why. If you select
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the scan are from the preview window, or by hand typing the num-
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bers everything is fine. The SIGSEGV happens deep in gtk library
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(gdk). I really cannot debug it.
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<B>Options</B> <B>too</B> <B>much</B>
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It is possible, especially for the ColorOneScanner, that the
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backend's options panel to exceed from your screen. It happens
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with mine and I am running at 1024x768 my X Server. What can I
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say? Try smaller fonts in the X server, or virtual screens.
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<B>Weird</B> <B>SCSI</B> <B>behaviour.</B>
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I am quoting David Myers Here...
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>> OS: FreeBSD 2.2.6
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>> CC: egcs-1.02
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>Just wanted to follow up on this... I recently changed my SCSI
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card from
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>the Adaptec 2940UW to a dual-channel Symbios 786 chipset. When
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I started up
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>SANE with your driver, I managed to scan line art drawings
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okay, but Gray16
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>scans led to a stream of SCSI error messages on the console,
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ultimately
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>hanging with a message saying the scanner wasn't releasing the
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SCSI bus.
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>This may be that the Symbios is simply less tolerant of ancient
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>hardware, or may be bugs in your driver or in SANE itself...
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</PRE>
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<H2>DEBUG</H2><PRE>
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If you encounter a GUI bug please set the environment variable
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SANE_DEBUG_APPLE to 255 and rerun the excact sequence of keystrokes and
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menu selections to reproduce it. Then send me a report with the log
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attached.
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It would be very helpfull if you have handy an Apple machine (I am not
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sure how Mackintoshs are spelled) with the AppleScanners driver
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installed and check what option are grayed out (inactive) in what modes
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and report back to me.
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If you want to offer some help but you don't have a scanner or you
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don't have the model you would like to offer some help, or you are a
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sane developer and you just want to take a look at how the apple back-
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end looks like. Goto to apple.h and #define the NEUTRALIZE_BACKEND
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macro. You can select the scanner model through the APPLE_MODEL_SELECT
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macro. Available options are APPLESCANNER, ONESCANNER, COLORONESCANNER.
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If you encounter a SCSI bus error or trimmed and/or displaced images
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please also set the environment variable SANE_DEBUG_SANEI_SCSI to 255
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before sendme the report.
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</PRE>
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<H2>TODO</H2><PRE>
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<B>Non</B> <B>Blocking</B> <B>Support</B>
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Make sane-apple a non blocking backend. Properly support for
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<B>sane_set_io_mode</B> and <B>sane_get_select_fd</B>
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<B>Scan</B> Make scan possible for all models in all supported modes.
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<B>Missing</B> <B>Functionality.</B>
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</PRE>
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<H2>SEE ALSO</H2><PRE>
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<B><A HREF="sane.7.html">sane(7)</A></B>, <B><A HREF="sane-scsi.5.html">sane-scsi(5)</A></B>
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</PRE>
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<H2>AUTHOR</H2><PRE>
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The sane-apple backend was written not entirely from scratch by Milon
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Firikis. It is mostly based on the mustek backend from David Mosberger
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and Andreas Czechanowski
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sane-backends 1.0.13 13 May 1998 <B><A HREF="sane-apple.5.html">sane-apple(5)</A></B>
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</PRE>
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<HR>
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<ADDRESS>
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Man(1) output converted with
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<a href="http://www.oac.uci.edu/indiv/ehood/man2html.html">man2html</a>
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