operating system launches the file. This is done by “chmod:ing” the file: chmod 755 perl_fu_script.pl and with a special line in the top of the Perl file: #!/usr/local/bin/perl This special line tells your code; } exit main; (This distribution comes with example scripts. One is examples/example-fu.pl, which is a small Gimp::Fu-script you can take as a starting point for your experiments). Attention: for some firmware versions; on others only lineart PSD umax stable PowerLook umax stable Not tested PL-III umax stable Only works with some scanners (unknown why) PowerLook III umax stable Not tested PowerLook