1sane-rts8891(5)          SANE Scanner Access Now Easy          sane-rts8891(5)
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NAME

6       sane-rts8891 - SANE backend for rts8891 based scanners
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DESCRIPTION

9       The  sane-rts8891  library  implements a SANE (Scanner Access Now Easy)
10       backend that provides access to scanners based on the rts8891 ASIC.
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12       The scanners that work with this backend are:
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14                 Vendor Model           status
15              ----------------------  -----------
16                Umax Astra 4400       untested
17                Umax Astra 4450       untested
18                HP scanjet 4000c      good
19                HP scanjet 4470c      good
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21       The options the backend supports can either be selected through command
22       line  options  to programs like scanimage(1) or through GUI elements in
23       xscanimage(1) or xsane(1).
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25       If you notice any strange behavior, please report to the backend  main‐
26       tainer or to the SANE mailing list.
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28       Valid command line options and their syntax can be listed by using
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30              scanimage --help -d rts8891
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33       Scan Mode Options
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36       --mode selects the basic mode of operation of the scanner valid choices
37              are R Color, Gray and Lineart The default  mode  is  Color.  The
38              Lineart  mode  is  black and white only (1 bit).  Grayscale will
39              produce 256 levels of gray (8 bits). Color mode allows for  over
40              16  million  different  colors  produced  from  24 bits of color
41              information.
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44       --resolution
45              selects the resolution for a scan. The horizontal  and  vertical
46              resolutions  are set by the value of this option. The scanner is
47              capable of the following resolutions for  the  specified  option
48              value:
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50                Value   Hor. Resolution  Vert. Resolution
51                -----   ---------------  -------------------
52                75      75dpi            75dpi
53                150     150dpi           150dpi
54                300     300dpi           300dpi
55                600     600dpi           600dpi
56                1200    1200dpi          1200dpi
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59       --preview
60              requests a preview scan. The resolution used for that scan is 75
61              dpi and the scan area and the scan mode are as specified through
62              their  options,  or  the  default  if not specified. The default
63              value for preview mode is "no".
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66       --threshold
67              selects the   minimum-brightness  to  get  a  white  point.  The
68              threshold is only used with Lineart mode scans.  It is specified
69              as a percentage in the range  0..100%  (in  steps  of  1).   The
70              default value of the threshold option is 50.
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CONFIGURATION FILE

75       The configuration file /etc/sane.d/rts8891.conf contains the usb device
76       ids of supported scanners (eg usb 0x043d 0x007c) and scanner configura‐
77       tion  options.  Empty lines and lines starting with a hash mark (#) are
78       ignored.
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80       The options supported are allowsharing, modelnumber
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82       Option
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84       allowsharing
85              enables or not the sharing of the scanner between multiple fron‐
86              tends at the same time.
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88       modelnumber
89              is  used  to force the reported model by the backend and is only
90              useful in the case of a scanner which NVRAM has been erased.
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92              0 to report a HP4470c.
93              1 to report a HP4400c.
94              2 to report an Astra 4400.
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FILES

98       /usr/lib64/sane/libsane-rts8891.a
99              The static library implementing this backend.
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101       /usr/lib64/sane/libsane-rts8891.so
102              The shared library implementing this backend (present on systems
103              that support dynamic loading).
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ENVIRONMENT

107       SANE_DEBUG_RTS8891 SANE_DEBUG_RTS8891_LOW SANE_DEBUG_RTS88XX_LIB
108              If  the  library  was compiled with debug support enabled, these
109              environment variables control the debug level for this  backend.
110              E.g.,  a  value  of 255 requests all debug output to be printed.
111              Smaller levels reduce verbosity.
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LIMITATIONS

115       Scanners of the same model exist with different sensors, due to lack of
116       data  (ie  USB  logs) some sensors are better supported than others. At
117       least 75 dpi mode is working for any model. Sharing the scanner between
118       several  frontends  at the same time (allowsharing option) may not work
119       on some USB controllers.
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121       XPA is not (yet) supported.
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BUGS

124       No bugs currently known.
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SEE ALSO

128       sane-scsi(5), scanimage(1), xscanimage(1), xsane(1), sane(7)
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AUTHOR

132       This backend has been developed by Stéphane Voltz.
133              http://stef.dev.free.fr/sane/rts8891
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CREDITS

137       Many thanks go to:
138              Laurent Fournier who donated me a HP4470c.  Vladimir Sysoev  and
139              "TheUnruly  Squash" for the time they spent recording USB activ‐
140              ity and testing the experimental version on HP4400 models.
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144                                  8 Dec 2008                   sane-rts8891(5)
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