[How to create a border]

Am I correct in thinking that with all these methods, the border is masking parts of the image?

Is there a way to create a border without losing any of the image itself?

Cheers

[How to create a border]

No doubt a easy question, but it's eluding my simple brain.

I have tried a method described elsewhere whereby you reduced the canvas size to say 95% then increase it by 105%, but the problem with this is that it doesn't create a border of equal width. The sides of a landscape orientated rectangular image end up being thicker than the top and bottom.

Is there a simple method for obtaining a border of equal thickness?

Thanks