what should i do to make both images of same size

lena.jpg image is having value 256*256 uint8 while kssk.jpg is having value 225*225*3 uint8. i want image of value 256*256 uint8,how to make it same or anyone is having pls attach sample

 Accepted Answer

im = imread('kssk.jpg');
newIm = rgb2gray(imresize(im, [256, 256]));

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