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280 wiersze
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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 <I>sane-devel@alioth-</I>
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<I>lists.debian.net</I>. See <I>http://www.sane-project.org/mailing-lists.html</I>
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for details on how to 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 the path-name for the special device that corresponds
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to a SCSI scanner. For SCSI scanners, the special device name must be a
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generic SCSI device or a symlink to such a device. Under Linux, such a
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device name could be <I>/dev/sga</I> or <I>/dev/sge</I>, for example. See
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<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 <I>apple.conf</I> file is a list of options and device names that corre-
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spond to Apple scanners. Empty lines and lines starting with a hash
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mark (#) are ignored. See <B><A HREF="sane-scsi.5.html">sane-scsi(5)</A></B> on details of what constitutes
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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, but
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without an interrupt line, scanning will put so much load on the system
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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 is list of directories where SANE
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looks for the configuration file. On *NIX systems, directory
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names are separated by a colon (`:'), under OS/2 by a semi-colon
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(`;'). If SANE_CONFIG_DIR is not set, SANE defaults to search-
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ing the current working directory (".") and then
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<I>/usr/local/etc/sane.d</I>. If the value of $SANE_CONFIG_DIR ends
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with the separator character, the default directories are
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searched after the directory list. For example, setting
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<B>SANE_CONFIG_DIR</B> to "/tmp/config:" would result in directories
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<I>tmp/config</I>, <I>.</I>, and <I>/usr/local/etc/sane.d</I> being searched (in that
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order).
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<B>SANE_DEBUG_APPLE</B>
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Controls the debug level. A value of 255 prints all debug out-
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put. Smaller values reduce verbosity. Requires a library com-
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piled with debug support.
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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 completed 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 three models lack upload/download 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 patterns or calibration vectors.
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<B>ColorOneScanner</B>
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Cannot up/download halftone patterns, calibration vectors, cus-
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tom Color Correction Tables (CCT) and of course custom gamma
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tables.
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<B>Park/UnPark</B> <B>(OneScanner,</B> <B>ColorOneScanner)</B>
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Some capabilities are missing.
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The above functionalities are missing because I don't have the hardware
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to experiment on. Another reason is my lack of understanding as to how
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or if the SANE API provide means to describe any array type besides
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gamma.
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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 while I
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maintain 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 if it could intermix dif-
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ferent options for different windows (scan areas). This way it
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could scan a document in LineArt mode but the figures in it in
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Gray and at 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 on the 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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SANE backend bugs are divided in two classes. We have <B>GUI</B> bugs and
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<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 when it
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should (active) or vice versa. Finding out which parameters are active
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across various Apple modes and models from the documentation
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<I>ftp://ftpdev.info.apple.com/devworld/Technical</I><B>_</B><I>Documentation/Peripher-</I>
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<I>als</I><B>_</B><I>Documentation/</I> is an interesting exercise. I may have missed some
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dependencies. For example of the threshold parameter the Apple Scanners
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Programming Guide says nothing. I had to assume it 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 one place states that the width of the
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scan area should be a byte multiple. In another place it says that the
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width of the scan area should be an even byte multiple. Go figure...
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Other sources of bugs are due to scsi communication, scsi connects and
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disconnects. However the classical bugs are still there. So you may
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encounter buffer overruns, null pointers, memory corruption and <B>SANE</B>
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API 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 area 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, for the
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backend's options panel to extend beyond your screen. It happens
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with mine and I am running my X Server at 1024x768. 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 the Adaptec 2940UW to a dual-channel Symbios 786
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chipset. When I started up SANE with your driver, I managed to
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scan line art drawings okay, but Gray16 scans led to a stream of
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SCSI error messages on the console, ultimately hanging with a
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message saying the scanner wasn't releasing the SCSI bus. This
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may be that the Symbios is simply less tolerant of ancient hard-
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ware, 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 environmental variable
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<B>SANE_DEBUG_APPLE</B> to 255 and rerun the exact 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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If you have an Apple Macintosh with the AppleScanners driver installed,
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reporting to me which options are grayed out (inactive) in what modes
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would be very helpful.
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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 help with, or you are a SANE
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developer and you just want to take a look at how the apple backend
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looks like, goto to <I>apple.h</I> and #define the <B>NEUTRALIZE_BACKEND</B> macro.
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You can select the scanner model through the APPLE_MODEL_SELECT macro.
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Available options are <B>APPLESCANNER</B>, <B>ONESCANNER</B>, and <B>COLORONESCANNER</B>.
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If you encounter a SCSI bus error or trimmed and/or displaced images
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please set the environment variable SANE_DEBUG_SANEI_SCSI to 255 before
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sending me 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 <B>sane-apple</B> a non blocking backend. Properly support
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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 scanning possible for all models in all supported modes.
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Add other missing functionality
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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 <B>sane-apple</B> backend was written not entirely from scratch by Milon
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Firikis. It is mostly based on the <B><A HREF="sane-mustek.5.html">sane-mustek(5)</A></B> backend from David
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Mosberger and Andreas Czechanowski
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11 Jul 2008 <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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</ADDRESS>
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