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How to resize an image into size 256*256

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Anushka
Anushka 2015-5-27
回答： Image Analyst 2015-5-27
I used the following code
J = J(1:256,1:256,:)
[r c]=size(J);
display(r); display(c);
But the value of c is displayed as 768.But the resized size is 256.What would be the error.And I cant use the command imresize since I need the third coordinate also.

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回答（2 个）

Image Analyst
Image Analyst 2015-5-27
Never use size like that for a color image. Use
[rows, columns, numberOfColorChannels] = size(J);
For more info, see Steve's blog: http://blogs.mathworks.com/steve/2011/03/22/too-much-information-about-the-size-function/
Thorsten
Thorsten 2015-5-27
编辑：Thorsten 2015-5-27
Use
r = size(J, 1); c = size(J, 2);
If J is a color image, c returns the columns*3. See also my answer to your first question http://www.mathworks.com/matlabcentral/answers/218747-how-to-divide-an-image-into-blocks-and-find-the-rgb-values-of-each-pixels-in-a-block

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