Image unscrambling using Arnold Cat Map method

Hi Everyone, I am trying to scramble/unscramble an Image using Arnold scrambling method during encryption/decryption process. I got a correct image after performing unscramble process using Arnold method but it is slightly shifted to the right as well as to the top direction and remaining portion is displayed to the left side and to the bottom side. Please help me to get an unscrambled image with correct pixel position. I can show sample image but not able to upload that.

Thanks in advance.

[Walter Roberson]

http://www.mathworks.com/matlabcentral/answers/?term=tag%3A%22cat+map%22

[mamoona]

hey! do you have the matlab code for image scrambling and unscrambling using arnold cat map? i am working on colored images.