Hi izac2, It's hard to say what might be going wrong without knowing more about how you are setting up your training data. It does sound like ENVI thinks that none of the pixels in your image are close enough to the classes defined by your training data. Which probably means that you've set a probability threshold that none of the pixels meet for any of the classes. If you have access to Exelis VIS Tech Support or a local distributor, you might want to contact them directly. That way you can show them your image and training data, and they may be able to comment on your specific situation. Regards, Peg Exelis VIS