Image edge to black

Hi,

Anyone develop algorithm to change the outer pixel(edge) become full black ? like a frame.

Thanks

[Jan]

Currently the best answer is:

 Yes.

The algorithm is such trivial that I'm convinced, that somebody did this already.

Answer 1

[Image Analyst]

How about

imageArray(1,:) = 0;
imageArray(end,:) = 0;
imageArray(:,1) = 0;
imageArray(:,end) = 0;