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How to assign an image to another with a black frame?

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I used the code given below to assign another picture to a black filled picture. The given picture has to fit into the black background at the center so that it looks as if it is framed.
But the result is:
1.JPG
I'd like the pic I loaded, (that is j) inside the box. I tried a lot! Please help! Many thanks in advance! :)
j=imread('1.jpg');
[na, nb, nc]=size(j);
b=40;
j_big=zeros(na+2*b, nb+2*b, nc);
j_big(b+1:b+na, b+1:b+nb, :)=j;
imshow(j_big);

Accepted Answer

Image Analyst
Image Analyst on 2 Mar 2019
Why not just use padarray()?
  1 Comment
Edwin Joy
Edwin Joy on 2 Mar 2019
Edited: Edwin Joy on 2 Mar 2019
Oh okay. Thank you!
But I still don't understand why I just get some pixels scattered around the image when I use the code mentioned. I even tried to use loops and copy pixel by pixel to find out the error but it's still giving me the same result.
EDIT:
Yay! I got it. Well it appeared when I changed the array to unsigned int8.

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