Alicia said in her message: hi Agus, what is ENVI? thanks alicia ENVI is an image proc. package built over IDL and simmilar (fancier too) to SIPS. You get it along with IDL for little more money (at least in Europe). I have not tried it out yet, but I know it's in use at Colorado Boulder. I'm planning to download it by the end of this month. De nada!