sane-hp - SANE backend for HP ScanJet scanners
The sane-hp library implements a SANE (Scanner Access Now Easy) backend that provides access to HP ScanJet scanners which support SCL (Scanner Control Language by HP). The following scanners are known positively to work with this backend: Model: Product id: Interface: ---------- ----------- ---------- ScanJet Plus C9195A HP Parallel Interface Card ScanJet IIc C1750A 3226 SCSI ScanJet IIcx C2500A 3332 SCSI ScanJet IIp C1790A SCSI ScanJet 3C C2520A 3503 SCSI ScanJet 3P C2570A 3406 SCSI ScanJet 4C C2520A SCSI ScanJet 4P C1130A 3540 SCSI ScanJet 4100C C6290A USB ScanJet 5P C5110A SCSI ScanJet 5100C C5190A parallel port ScanJet 5200C C7190A 3846 parallel port/USB ScanJet 6100C C2520A 3644 SCSI ScanJet 6200C C6270A 3828 SCSI/USB ScanJet 6250C C6270A 3828 SCSI/USB ScanJet 6300C C7670A SCSI/USB ScanJet 6350C C7670A SCSI/USB ScanJet 6390C C7670A SCSI/USB PhotoSmart C5100A R029,R030,R032 SCSI Support for models 5100C/5200C connected to the parallel port requires the ppSCSI driver available at http://cyberelk.net/tim/parport/ppscsi.html and http://penguin- breeder.org/kernel/download/. Support for models 5200C/62X0C/63X0C connected to the USB require the kernel scanner driver or libusb. See sane-usb(5) for more details. The "hp" backend no longer supports OfficeJet multi-function peripherals. For these devices use the external "hpoj" backend in version 0.90 and later of the "HP OfficeJet Linux driver", available at http://hpoj.sourceforge.net Because Hewlett-Packard does no longer produce scanners that support SCL (beside the OfficeJets), the above list of supported scanners is complete. Other HP scanners are not supported by the "hp" backend, but might be supported by another one. See http://www.sane-project.org/. You can also watch the sane-devel mailing list at http://www.sane-project.org/mailing-lists.html. More details about the hp backend can be found on its homepage http://www.kirchgessner.net/sane.html.
This backend expects device names of the form: special Where special is the UNIX path-name for the special device that corresponds to the 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/sg2, for example. If the special device name contains "usb", "uscanner" or "ugen", it is assumed that the scanner is connected by USB. For the HP ScanJet Plus the special device name must be the device that corresponds to the parallel interface card that was shipped with the scanner. That is /dev/hpscan. A special driver is required for this card. See ftp://rvs.ctrl-c.liu.se/pub/wingel/hpscan for details. If the link does not work, try ftp://sunsite.unc.edu/pub/Linux/kernel/patches/scanners.
The contents of the hp.conf file is a list of options and device names that correspond to HP ScanJet scanners. Empty lines and lines starting with a hash mark (#) are ignored. See sane-scsi(5) and sane-usb(5) on details of what constitutes a valid device name. Options specified in front of the first line that contains a device name are defaults for all devices. Options specified below a line that contains a device name apply just to the most recently mentioned device. Supported options are connect-scsi, connect-device, enable-image-buffering, and dumb-read. Option connect-scsi specifies that the scanner is connected to the system by SCSI. Input/output is performed using SCSI-commands. This is the default. But if your SCSI device name contains "usb", "uscanner" or "ugen", option connect-scsi must be specified. Otherwise it is assumed that the scanner is connected by USB. Option connect-device specifies that the scanner is connected to the system by a special device. Input/output is performed by read()/write()-operations on the device. This option must be used for HP ScanJet Plus or scanners connected to USB which are accessed through a named device (e.g. /dev/usb/scanner0). For device names that contain "usb", "uscanner" or "ugen", it is not necessary to specify option connect-device. Option enable-image-buffering stores the scanned image in memory before passing it to the frontend. Could be used in case of forward/backward moving scanner lamp. Option dumb-read can be used to work around problems with "Error during device I/O". These problems may occur with certain SCSI-to-USB converters or Buslogic SCSI cards. The option should not be used for SCSI devices which are working correctly. Otherwise startup of frontends and changing parameters might be slower. A sample configuration file is shown below: /dev/scanner # this is a comment /dev/hpscan option connect-device /dev/scanner is typically a symlink to the actual SCSI scanner device.
/etc/sane.d/hp.conf The backend configuration file (see also description of SANE_CONFIG_DIR below). /usr/lib/arch_triplet/sane/libsane-hp.a The static library implementing this backend. /usr/lib/arch_triplet/sane/libsane-hp.so The shared library implementing this backend (present on systems that support dynamic loading). $HOME/.sane/calib-hp:<device>.dat Calibration data for HP PhotoSmart PhotoScanner that is retrieved from the scanner after calibration. The data is uploaded to the scanner at start of the backend if it is in media mode 'print media' or if the media mode is changed to 'print media'.
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 /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). SANE_DEBUG_HP 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. SANE_HOME_HP Only used for OS/2 and along with use of HP PhotoSmart PhotoScanner. Must be set to the directory where the directory .sane is located. Is used to save and read the calibration file. SANE_HP_KEEPOPEN_SCSI SANE_HP_KEEPOPEN_USB SANE_HP_KEEPOPEN_DEVICE For each type of connection (connect-scsi, connect-usb, connect-device) it can be specified if the connection to the device should be kept open ("1") or not ("0"). Usually the connections are closed after an operation is performed. Keeping connection open to SCSI-devices can result in errors during device IO when the scanner has not been used for some time. By default, USB-connections are kept open. Other connections are closed. SANE_HP_RDREDO Specifies number of retries for read operation before returning an EOF error. Only supported for non-SCSI devices. Default: 1 retry. Time between retries is 0.1 seconds.
HP PhotoSmart PhotoScanner In media mode 'slide' and 'negative', scan resolutions are rounded to multiple of 300 dpi. The scanner does not scale the data correctly on other resolutions. Some newer models (firmware code R030 and later) do not support adjustment of contrast/intensity level and tone map. The backend will simulate this by software, but only for gray and 24 bit color. Automatic Document Feeder (ADF) For use of the ADF with xscanimage(1), first place paper in the ADF and then change option scan source to 'ADF'. Press 'change document' to load a sheet. Then press 'scan' to start a scan. Maybe it is sufficient to press 'scan' without 'change document' for repeated scans. The use of the preview window is not recommended when working with the ADF. Setting a window to scan from ADF is not supported with xscanimage(1). Try xsane(1). Immediate actions Some actions in xscanimage(1) (i.e. unload, select media, calibrate) have an immediate effect on the scanner without starting a scan. These options can not be used with scanimage.
HP PhotoSmart PhotoScanner PhotoScanners with firmware release R030 and up have no firmware support for contrast/brightness/gamma table. In the current backend this is simulated by software on 24 bits data. Simulation on 30 bits should give better results. Data widths greater than 8 bits Custom gamma table does not work. Parallel scanner support Beside the ScanJet Plus which came with its own parallel interface card, currently only the HP ScanJet 5100C/5200C are supported. These scanners are using an internal parallel-to- SCSI converter which is supported by the ppSCSI-driver (see above).
The sane-hp backend was written by Geoffrey T. Dairiki. HP PhotoSmart PhotoScanner support by Peter Kirchgessner. 13 Jul 2008 sane-hp(5)
Personal Opportunity - Free software gives you access to billions of dollars of software at no cost. Use this software for your business, personal use or to develop a profitable skill. Access to source code provides access to a level of capabilities/information that companies protect though copyrights. Open source is a core component of the Internet and it is available to you. Leverage the billions of dollars in resources and capabilities to build a career, establish a business or change the world. The potential is endless for those who understand the opportunity.
Business Opportunity - Goldman Sachs, IBM and countless large corporations are leveraging open source to reduce costs, develop products and increase their bottom lines. Learn what these companies know about open source and how open source can give you the advantage.
Free Software provides computer programs and capabilities at no cost but more importantly, it provides the freedom to run, edit, contribute to, and share the software. The importance of free software is a matter of access, not price. Software at no cost is a benefit but ownership rights to the software and source code is far more significant.
Free Office Software - The Libre Office suite provides top desktop productivity tools for free. This includes, a word processor, spreadsheet, presentation engine, drawing and flowcharting, database and math applications. Libre Office is available for Linux or Windows.
The Free Books Library is a collection of thousands of the most popular public domain books in an online readable format. The collection includes great classical literature and more recent works where the U.S. copyright has expired. These books are yours to read and use without restrictions.
Source Code - Want to change a program or know how it works? Open Source provides the source code for its programs so that anyone can use, modify or learn how to write those programs themselves. Visit the GNU source code repositories to download the source.
Study at Harvard, Stanford or MIT - Open edX provides free online courses from Harvard, MIT, Columbia, UC Berkeley and other top Universities. Hundreds of courses for almost all major subjects and course levels. Open edx also offers some paid courses and selected certifications.
Linux Manual Pages - A man or manual page is a form of software documentation found on Linux/Unix operating systems. Topics covered include computer programs (including library and system calls), formal standards and conventions, and even abstract concepts.