The security is considered as the most challenging aspect in any of the networks. Since the growth of Internet and online applications is increasing at a rapid rate, security of data being transmitted over network is a major concern today for users. The first line of security is cryptography which is important for securing the data over insecure networks. Data transmitted over the network can be in any form such as text, images, videos, etc. This paper addresses various cryptographic algorithms implemented over a real image of Indian airbase station taken from Google image, and a fair comparison among symmetric algorithms AES, DES, and Blowfish has been done. The paper further examines various parameters to compare the efficiency of these algorithms over the image. The encryption and decryption processes are carried out in Java followed by the testing and analysis of various parameters using MATLAB.