Still images use for many purposes in different professional fields, for example we use images in our driving license, passports and other identity cards. Therefore images are very essential to make critical judgments in our day today life. Because of this people are tend to use new technologies for most of their activities. Furthermore astrophysicist's use still images taken by the Hubble telescope to investigate unknown parts of the universe. Even our scientists use high resolution images generated from the electron microscope along with their experiments. Today image evidence are playing big role in crime scene investigations and forensic computing. In Sri Lanka also our doctors use those Computed Tomography (CT) scanners, Magnetic Resonance Imaging (MRI) scanners and "X" rays to diagnose cancers in the human body which utterly use grayscale scan images for further diagnosis.