Correlation value is very good but imshow command shows corrupted image

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Mevlut Dogru
Mevlut Dogru 2015-12-14
编辑： Mevlut Dogru 2015-12-17
I measure similarities between the two images with Correlation(corr2(I,IW)). Although the correlation value is 0.998, I and IW images do not appear very similar. Two image must the same but it is understood difference at figure by the human eye (imshow(IW)).
According to the results of the mathematical correlation value, Should not see the difference by the human eye? (I,IW = uint8 images.)
I=double(imread('lena.gif')); W=double(imread('rose32.bmp'));
% Embedding % IW = watermarked image%
....
...
.... %
% Extracting % W1 = extracted image %
....
...
.... %
I = uint8(I); IW = uint8(IW); W = uint8(I); W1 = uint8(W1);
x= corr2(I,IW); figure(1); imshow(IW);

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