error while reconstructing an image showing white blank spaces while imshow

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I have trained few images in Artificial Neural network using back propogation algorithm and when i try to look back them using the following code,
for
...
% im = reshape(image(:,xx),row,col/3,3);
figure;
imshow(im)
....
end
i am getting a figure with white blank image. I have also tried using imshow(im,[]). But when i use im = reshape(image(:,xx),row,col); i am getting an image in 3 different component. But when i combine using im = reshape(image(:,xx),row,col/3,3) it appears as a white blank figure.
I didn't know the mistake. kindly help me out. thanks in advance.

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