How to pad zeros in an image

Hi If i have image of size 64*64 (one layer). I want to insert another column .The resulting image then would become 64*65.

red1=I(:,:,1)%I is the original image
b=zeros(64,1);
red=padarray(red1,b);

whats wrong with this.

I am not getting the desired result

Answer 1

[KSSV]

Let I be your 64*64 image.

iwant = [I zeros(64,1)] ; 

[sadiqa ilyas]

great