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'. This environment variable specifies the list of directories that may contain the configuration file. If the value of the environment variable ends with the directory separator character, then the default directories are searched after the explicitly spec ified directories. 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.
In media mode 'slide' and 'negative', scan resolu tions are rounded to multiple of 300 dpi. The scan ner does not scale the data correctly on other res olutions. The backend will simulate this by software, but only for gray and 24 bit color. Press 'change document' to load a sheet. Then press 'scan' to start a scan.