PSNR for RGB images

The function, PSNR_RGB( X,Y) computes the PSNR for two RGB images using the formula :

MSE(X,Y)=SUM(1,n)SUM(1,m)SUM(1,p) [X(i,j,k)-Y(i,j,k)]²

d= max(max(X),max(Y))|

PSNR(X,Y)=10.log( d.^2 / MSE)

with p=3, as three channels red, green and blue,

The code can be altered for gray scale image sequences , or Volume of pixels M(n,m,p) ( p > 3 ) .

Some results are in the pdf file " PSNR_RGB.pdf " for discussion .