NAME¶
scanadf - acquire multiple images from a scanner equipped with an ADF
SYNOPSIS¶
scanadf [ -d | --device-name dev ] [ -h | --help ]
[ -L | --list-devices ] [ -v | --verbose ] [ -V | --version
] [ -o | --output-file name ] [ -N | --no-overwrite ]
[ -S | --scan-script name ] [ --script-wait ] [ -s |
--start-count num ] [ -e | --end-count num ] [ -r
| --raw ] [ device-specific-options ]
DESCRIPTION¶
scanadf is a command-line interface to control image acquisition devices
which are capable of returning a series of images (e.g. a scanner with an
automatic document feeder (ADF)). The device is controlled via command-line
options. After command-line processing,
scanadf normally proceeds to
acquire a series of images until the device returns the
SANE_STATUS_NO_DOCS status code.
The images are written to output files, specified by the
--output-file
option. These files are typically written in one of the PNM (portable aNyMaP)
formats (PBM for black-and-white images, PGM for grayscale images, and PPM for
color images). Several optional frame formats (SANE_FRAME_JPEG,
SANE_FRAME_G31D, SANE_FRAME_G32D, SANE_FRAME_G42D, and SANE_FRAME_TEXT) are
supported. In each case, the data is written out to the output file as-is
without a header. Unrecognized frame formats are handled in the same way,
although a warning message is printed in verbose mode.
Typically, the optional frame formats are used in conjunction with a scan script
(specified by the
--scanscript option) which is invoked for each
acquired image. The script is provided with a series of environment variables
which describe the parameters and format of the image file.
scanadf accesses image acquisition devices through the SANE (Scanner
Access Now Easy) interface and can thus support any device for which there
exists a SANE backend (try "apropos sane\-" to get a list of
available backends).
OPTIONS¶
The
-d or
--device-name options must be followed by a SANE
device-name. A (partial) list of available devices can be obtained with the
--list-devices option (see below). If no device-name is specified
explicitly,
scanadf will attempt to open the first available device.
The
-h or
--help options request help information. The information
is printed on standard output and in this case, no attempt will be made to
acquire an image.
The
-L or
--list-devices option requests a (partial) list of
devices that are available. The list is not complete since some devices may be
available, but are not listed in any of the configuration files (which are
typically stored in directory /etc/sane.d). This is particularly the case when
accessing scanners through the network. If a device is not listed in a
configuration file, the only way to access it is by its full device name. You
may need to consult your system administrator to find out the names of such
devices.
The
-v or
--verbose options increase the verbosity of the
operation of
scanadf. The option may be specified repeatedly, each time
increasing the verbosity level.
The
-V or
--version option requests that
scanadf print the
program and package name, as well as the version number of the SANE
distribution that it came with.
The
-o or
--output-file option specifies a format string used to
generate the name of file to write the image data to. You can use %d
replacement in the output file name; this will be replaced with the current
page number. The default format string is image-%04d.
The
-N or
--no-overwrite option prevents
scanadf from
overwriting existing image files.
The
-S or
--scan-script option specifies the name of script to run
after each scanned image is acquired. The script receives the name of the
image output file as its first and only command line argument. Additionally
the scan script can reference the following environment variables to get
information about the parameters of the image.
- SCAN_RES
- - the image resolution (in DPI)
- SCAN_WIDTH
- - the image width (in pixels)
- SCAN_HEIGHT
- - the image height (in pixels)
- SCAN_DEPTH
- - the image bit-depth (in bits)
- SCAN_FORMAT
- - a string representing the image format (e.g. gray, g42d, text, etc)
- SCAN_FORMAT_ID
- - the numeric image format identifier
If the
--script-wait option is given, scanadf will wait until all
scan-scripts have been finished before exiting. That will be useful if scanadf
is used in conjunction with tools to modify the scanned images.
The
-s or
--start-count option specifies the page number of first
scanned image.
The
-e or
--end-count option specifies the last page number to
scan. Using this option, you can request a specific number of pages to be
scanned, rather than scanning until there are no more images available.
The
-r or
--raw option specifies that the raw image data be
written to the output file as-is without interpretation. This disables the
writing of the PNM header for basic frame types. This feature is usually used
in conjunction with the
--scan-script option where the scan script uses
the environment variables to understand the format and parameters of the image
and converts the file to a more useful format. NOTE: With support for the
optional frame types and the default handling of unrecognized frametypes, this
option becomes less and less useful.
As you might imagine, much of the power of
scanadf comes from the fact
that it can control any SANE backend. Thus, the exact set of command-line
options depends on the capabilities of the selected device. To see the options
for a device named
dev , invoke
scanadf via a command-line of
the form:
scanadf --help --device dev
The documentation for the device-specific options printed by
--help is
explained in the manual page for
scanimage.
FILES¶
- /etc/sane.d
- This directory holds various configuration files. For details, please
refer to the manual pages listed below.
"SEE ALSO"¶
scanimage(1),
xscanimage(1),
sane(7)
AUTHOR¶
Transliterated from the C original by Jeffrey Ratcliffe.
BUGS¶
All the bugs of scanadf and much, much more.
This program relies on the backend to return the
SANE_STATUS_NO_DOCS
status code when the automatic document feeder is out of paper. Use of this
program with backends that do not support ADFs (e.g. flatbed scanners) will
likely result in repeated scans of the same document. In this case, it is
essential to use the start-count and end-count to control the number of images
acquired.
Only a subset of the SANE backends support feeders and return
SANE_STATUS_NO_DOCS appropriately. Backends which are known to work at this
time are:
- sane-bh
- - Bell+Howell Copiscan II series scanners.
- sane-hp
- - Hewlett Packard scanners. A patch to the sane-hp backend is necessary.
The --scantype=ADF option must be specified (earlier versions of the
backend used the --scan-from-adf option, instead).
- sane-umax
- - UMAX scanners. Support exists in build 12 and later. The
--source="Automatic Document Feeder" option must be
specified.