sane-test(5)

NAME
sane-test - SANE backend for testing frontends

DESCRIPTION
The sane-test library implements a SANE (Scanner Access Now Easy) backend that allows testing the SANE installation and SANE frontends. It provides access to a (nearly) unlimited number of virtual devices. There is no support for real scanners or cameras. However, the backend simulates scanning and setting options.

The idea is not only to find bugs in frontends but also to show all capabilities of SANE. Therefore sane-test implements functions and options that are not (or seldomly) found in other backends.

The backend is commented out in /etc/sane.d/dll.conf, so either the comment sign must be removed or the backend must be called explicitely. E.g. `scanimage -d test' or `xscanimage test'.

SANE OPTIONS
The options should be self-explanatory. Have a look at their descriptions. If a description is too vague, please contact me. Just some comments: The combination of color and 1-bit mode is quite obscure (8 colors) but allowed in the SANE standard. However, the meaning of bits is not defined. Currently 1 = high intensity and 0 = low intensity is used.

FILES

/etc/sane.d/test.conf
    The backend configuration file (see also description of SANE_CONFIG_DIR below). The initial values of most of the basic SANE options can be configured in this file. A template containing all the default values is provided together with this backend. One of the more interesting values may be number_of_devices. It can be used to check the frontend's ability to show a long list of devices. The config values concerning resolution and geometry can be usefull to test the handling of big file sizes.

/usr/lib/sane/libsane-test.a
    The static library implementing this backend.

/usr/lib/sane/libsane-test.so
    The shared library implementing this backend (present on systems that support dynamic loading).

ENVIRONMENT

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_TEST
    If the library was compiled with debug support enabled, this environment variable controls the debug level for this backend. Higher debug levels increase the verbosity of the output. Example: export SANE_DEBUG_TEST=4

SEE ALSO
sane(7), http://www.meier-geinitz.de/sane/test-backend/

AUTHOR
Henning Meier-Geinitz <henning@meier-geinitz.de>

BUGS
- config file values aren't tested for correctness - man page hasn't been completed yet