kopia lustrzana https://gitlab.com/sane-project/backends
199 wiersze
6.1 KiB
Groff
199 wiersze
6.1 KiB
Groff
.\" .IX sane-rts8891
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.TH "sane-rts8891" "5" "16 March 2008" "@PACKAGEVERSION@" "SANE Scanner Access Now Easy"
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.SH "NAME"
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sane-rts8891 \- SANE backend for Umax Astra 4400/4450 and Hewlett-Packard Scanjet 4470c scanners
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.SH "DESCRIPTION"
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The
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.B sane-rts8891
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library implements a SANE (Scanner Access Now Easy) backend that
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provides access to scanner based on Realtek RTS8891 ASIC.
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.PP
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The scanners that should work with this backend are:
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.PP
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.RS
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.ft CR
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.nf
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Vendor Model status
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\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\- \-\-\-\-\-\-\-\-\-\-\-
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Umax 4400 good
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Umax 4450 untested
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HP 4470c good re-badged Astra 4400
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.fi
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.ft R
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.RE
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The options the backend supports can either be selected through
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command line options to programs like scanimage or through GUI
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elements in xscanimage or xsane.
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.br
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If you have any strange behavior, please report to the backend
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maintainer or to the SANE mailing list.
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Valid command line options and their syntax can be listed by using
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.RS
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scanimage --help -d rts8891
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.RE
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.TP
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.B Scan Mode Options
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.TP
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.B --mode
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selects the basic mode of operation of the scanner valid choices are
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.I auto
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.R ,
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.I Color
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.R ,
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.I Gray
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and
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.I Lineart
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The default or automatic mode is Color. The Lineart mode is black and white only (1 bit).
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Grayscale will produce 256 levels of gray (8 bits). Gray and Lineart mode are emulated.
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Color mode allows for over 16 million different colors produced from 24 bits of color information.
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.TP
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.B --resolution
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selects the resolution for a scan. The horizontal and vertical resolutions are set
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by the value of this option. Default value is 150 dpi, automatic value is 75 dpi.
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The scanner is capable of the following resolutions for the specified option value:
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.PP
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.RS
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.ft CR
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.nf
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Value Hor. Resolution Vert. Resolution
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\-\-\-\-\- \-\-\-\-\-\-\-\-\-\-\-\-\-\-\- \-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-
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75 75dpi 150dpi lines are averaged to match dpi
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150 150dpi 150dpi
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300 300dpi 300dpi
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600 600dpi 600dpi
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1200 1200dpi 600dpi lines are duplicated to match dpi
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.fi
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.ft R
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.RE
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.TP
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.B --preview
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requests a preview scan. The resolution used for that scan is 75 dpi
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and the scan area and the scan mode are as specified through their options,
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or the default if not specified. The default and automatic value for preview mode is "no".
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.TP
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.B Image Enhancement Options
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.TP
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.B --threshold
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selects the minimum-brightness to get a white point. The threshold is only used with Lineart mode scans.
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It is specified as a percentage in the range 0..100% (in steps of 1).
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The default or automatic value of the threshold option is 50.
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.TP
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.B --custom-gamma
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allows the user to specify a gamma table (see gamma-table options). The default and automatic
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value is 'no'.
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.TP
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.B --gamma-table
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(gray and lineart modes) can be used to download a user defined
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gamma table for the gray channel. The table must be 256 SANE_Word long.
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Valid values are in the [0..255] range.
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The automatic or default value is a builtin gamma table. This option
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is active only if custom-gamma is set to yes.
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.TP
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.B --red-gamma-table
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(color mode only) can be used to download a user defined
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gamma table for the red channel. The table must be 256 SANE_Word long.
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Valid values are in the [0..255] range.
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The automatic or default value is a builtin gamma table. This option
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is active only if custom-gamma is set to yes.
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.TP
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.B --green-gamma-table
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(color mode only) can be used to download a user defined
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gamma table for the green channel. The table must be 256 SANE_Word long.
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Valid values are in the [0..255] range.
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The automatic or default value is a builtin gamma table. This option
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is active only if custom-gamma is set to yes.
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.TP
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.B --blue-gamma-table
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(color mode only) can be used to download a user defined gamma table
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for the blue channel. The table must be 256 SANE_Word long.
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Valid values are in the [0..255] range.
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The automatic or default value is a builtin gamma table. This option
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is active only if custom-gamma is set to yes.
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.TP
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.B Utility Options
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.TP
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.B --lamp-on
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this advanced option switches the lamp on. It is a set only option.
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.TP
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.B --lamp-off
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this advanced option switches the lamp off. It is a set only option.
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.SH "CONFIGURATION FILE"
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The configuration file @CONFIGDIR@/rts8891.conf contains only the usb device id (eg usb 0x043d 0x007c).
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.SH "FILES"
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.TP
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.I @LIBDIR@/libsane-rts8891.a
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The static library implementing this backend.
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.TP
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.I @LIBDIR@/libsane-rts8891.so
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The shared library implementing this backend (present on systems that
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support dynamic loading).
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.SH "ENVIRONMENT"
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.TP
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.B SANE_DEBUG_RTS88XX_LIB
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rts88xx library debugging messages control.
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.TP
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.B SANE_DEBUG_RTS8891_LOW
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rts8891 low-level access debugging messages control.
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.TP
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.B SANE_DEBUG_RTS8891
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rts8891 backend debugging messages control.
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.br
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.br
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If the library or backend was compiled with debug support enabled, these
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environment variables controls the debug level for this backend. E.g.,
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a value of 255 requests all debug output to be printed. Smaller levels
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reduce verbosity. Higher levels of debugging also gives PNM files holding
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data scanned at various stages of calibration and during final scan. In case
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you find a bug and want ot report about it, it is recommended to reproduce
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the bug whit these values set to 255, and join the debugging output to the
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report.
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.SH "LIMITATIONS"
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There is no support for transparency adaptor.
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.SH "BUGS"
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.br
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No bugs are currently known. In case you find a bug, you may report it to the maintainer,
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the sane-devel mailing list or fill a bug report at
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https://alioth.debian.org/tracker/?atid=410366&group_id=30186&func=browse
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.SH "SEE ALSO"
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sane-usb(5), scanimage(1), xscanimage(1), xsane(1), sane(7)
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.SH "AUTHOR"
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.TP
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This backend is currently developped by St<EFBFBD>phane Voltz.
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.I http://stef.dev.free.fr/sane/rts8891
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.SH "CREDITS"
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.TP
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Many thanks go to:
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Laurent Fournier who lent me his scanjet 4470c.
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Henry Wieland for the time spent recording USB activity and testing the experimental version.
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The ASIC registers analysis by Troy Rollo and Johannes Hub did provide me of some important
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hints on the operation of the RTS8891.
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