how to do image decryption using RSA alogrithm?

i tried this code for decryption of image using RSA algorithm. I'm not getting the original image back.
for i=1:x
for j=1:y
P(i,j)= mod((C(i,j)^d),n);
end
end
figure(3);
imshow(P);
where C is the encrypted image
please help.

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