Hi, FLTK seems to be the most popular GUI for ITK. I was wondering if there is any resources or examples using GTK or Qt (apart from the tutorial example) as the GUI front-end for ITK ? Dhanesh Ramachandram School of Computer Sciences, Universiti Sains Malaysia, 11800 Minden, Pulau Pinang, Malaysia. Tel:+604-6534046 Fax:+604-6573335