cmd line/scripting utility to darken images

[giuspen]

Hello,
I need to darken several images and was trying to have this done with image magick's convert but I can't find an option for that.
Can anybody help me, also with another tool?
Thanks in advance.

[diesch]

Have a look at http://www.fmwconcepts.com/imagemagick/exposure/index.php

[giuspen]

Have a look at http://www.fmwconcepts.com/imagemagick/exposure/index.php

It works great, thank you very much.