MATLAB: How to write zoom code with scale for an rgb image

imageimage analysisrgb

i write this one for gray image but i looking for rgb's too (nearest neighbor)
I1=[50 80 100 ; 115 21 90 ;32 50 160];
S=2 ;
[M , N]=size(I1);
M2=S*M;
N2=S*N;
I2=zeros(M2 , N2);
for i =1:M2 
    for j = 1:N2
        x =i/S;
        y=j/S;
        x2=round(x);
        y2=round(y);
        if (x2<1)||(x2>M)||(y2<1)||(y2>N)
    I2(i , j)=0;
else
    I2(i,j)=I1(x2 ,y2);
end
    end
end

Best Answer

for Channel = 1 : 3
 I1 = YourImage(:,:,Channel)
 now do the zooming here, just like above except without the assignment to I1
 I3(:, :, Channel) = I2;
end
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