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what does the colon mark indicates in the color seperation of image?

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TISA MARIA
TISA MARIA 2013-6-13
what does the colon mark indicates in the color separation of image Z(:,:,1)

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David Sanchez
David Sanchez 2013-6-13
It says you are taking all the elements.
example. If
Z = [1 2 3;
4 5 6;
7 8 9];
Then
Z(:,1) = [1;
4;
7];
Z(2,:) = [4 5 6];

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