command line .hexout compression

Hi,

I'm having a hard time generating a compressed .hexout file out of an .sof. I've looked into the shell scripting manual of the quartus_cpf utility, did everything "by the book" - to my understanding - and I still get the full size .hexout file. Could you help me see what I do wrong?

This is what I do:

 quartus_cpf -c source.sof target.hexout --option=optionfile 

where optionfile is a text file containing the following line:

 compression=on 

The command gets accepted but the resulting size of the .hexout is unchanged.

Performing the conversion in Quartus GUI with "compressed" option results in a .hexout file of about 40% the size of the one I get in command line.

What do I do wrong?

Thanks!