  This paper is to create a practical steganographic implementation to hide
color image (stego) inside another color image (cover). The proposed technique
uses Five Modulus Method to convert the whole pixels within both the cover and
the stego images into multiples of five. Since each pixels inside the stego
image is divisible by five then the whole stego image could be divided by five
to get new range of pixels 0..51. Basically, the reminder of each number that
is not divisible by five is either 1,2,3 or 4 when divided by 5. Subsequently,
then a 4-by-4 window size has been implemented to accommodate the proposed
technique. For each 4-by-4 window inside the cover image, a number from 1 to 4
could be embedded secretly from the stego image. The previous discussion must
be applied separately for each of the R, G, and B arrays. Moreover, a stego-key
could be combined with the proposed algorithm to make it difficult for any
adversary to extract the secret image from the cover image. Based on the PSNR
value, the extracted stego image has high PSNR value. Hence this new
steganography algorithm is very efficient to hide color images.
