I don't know what you're asking, so I'll just attach some demos of using fft2 on pictures. Maybe they'll help, since I don't know what "left and right pic in specter" means.
If you still have questions, read http://www.mathworks.com/matlabcentral/answers/6200-tutorial-how-to-ask-a-question-on-answers-and-get-a-fast-answer and come back with more information on how we can help.
