There seems to be a bug with the wrapper scripts bundled with the precompiled linux version, which prevents arguments from being passed to the program. To fix the problem open the process_image file in a text editor (it's simply a perl script) and change the last line from:
or simply replace with the attached script. Unfortunately the problem exists in all the scripts so if you want to use other programs you will have to do similar fixes.
I will try to release a new precompiled linux version without this problem as soon as I have some free time.
Thanks for the bug report!