Hi! I want to make a classification of a large number of images (640) with the same parameters, and I think that the best way is using a loop. But I don't know how to make than IDL open diferent image files and later. put a diferent name to all output information generated. The image's names are like 'IMG_001', 'IMG_002'... to 'IMG_640'. How can I do it? Thanks for your time!