PSNR, NPCR, UACI and how to convert gray to RGB

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A.SABU on 4 Apr 2013
Good Night Image Analyst Sir, I am doing project in Image Encryption so i want to calculate the PSNR NPCR and UACI of the image.
i want a code for converting the standard camreaman.tif image to RGB. i also need to know how to gray scale images into RGB for each and every image . openly telling i am poor in Matlab so kindly provide with detail explaination i belive and hope u

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