Hello, does ITK provide transformation operations such as matrix = multiplication, adition,.... ?? Thanks, Zein ->8<------------->8<------------->8<------------->8<------------->8<-----= -------->8<- Zein I. Salah=20 University of T=FCbingen, WSI-GRIS, Sand 14, 72076 T=FCbingen=20 Email: salah@gris.uni-tuebingen.de Tel.: (07071) 29 75465 (GRIS), Fax: (07071) 29 54 66