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How would i extract ONLY even numbered elements of an image?

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I have an image that I am suppose to `Half' the size of the image (i.e. reducing it to 256x256) by extracting only even numbered elements. This is my code so far:
% Part i.
A1= rgb2gray(imgroup0);
imgroup1=imresize(A1, [512 512]);
% Part ii.
But i dont understand how mod will help me 'extract' the even numbers from the image or how i would display it afterwards. Can someone explain?

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Bhaskar R
Bhaskar R el 5 de Mzo. de 2020
Editada: Bhaskar R el 5 de Mzo. de 2020
Part ii
% for even values
even_values = imgroup1(mod(imgroup1, 2) == 0);
% for display purpose
evens = imgroup1.*uint8(mod(imgroup1, 2) == 0);
figure, imshow(evens);

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