You need to be more specific. http://www.mathworks.com/matlabcentral/answers/6200-tutorial-how-to-ask-a-question-on-answers-and-get-a-fast-answer
Try attaching your image and telling us what you want to classify. In the meantime, check out my file exchange for demos on how to classify regions based on gray level intensity and color. http://www.mathworks.com/matlabcentral/fileexchange/?term=authorid%3A31862
