A common question I get all the time is “How do I get square corners on the borders of the photos in a spread?”

The fastest and easiest way, whether you are stroking the photos using Edit—Stroke, or using a Layer Style by doubleclicking on the layer and then choosing Stroke, is to stroke inside.

This image is a photo on a layer above a white background. If you stroke Outside, you will get rounded corners, as you see here. Center will give you the same thing, just not so rounded.

In this image, you can see that Inside was chosen, and the corners are square. Just be aware that this cuts off the outside of the image area. This has never been a problem for me, since I never have my subjects so close to the edge that the sliver that is covered by the border would be missed.