Steganography encompasses techniques of transmitting secret data through innocuous covers such as that its presence cannot be detected. The aim of this book is to design and implement Image in Image Steganography System (IISS) that hides secrete image into cover image without causing any a significant effect on the quality of the cover image. In this work, an adaptive hiding method has been implemented to hide the gray scale or color image into color image only, the main objective is to increase the hiding rate.