Create a custom border in Photoshop

[pkurdt]

I have trapezoid with rounded corners that I would like to put an embattled border around the inside of.  How would I do this in Photoshop?

[Trevor.Dennis]

You need to use the shape of the trapezoid  to make a mask.  So first thing to do is male a selection of shape.  You'll need to show us the shape for more of an answer.

Is the Trapezoid on its own layer?

Does it have areas of transparency?

[pkurdt]

The trapezoid is its own layer.  I am not planning on it having areas of transparency.

[Derek Cross]

Also have a look at some of the border Actions that come with Photoshop and which can be adjusted.

[pkurdt]

Derek, I am relatively new to Photoshop, and don't know which would be the best way to get the desired result.  Which method do you recommend?

[pkurdt]

This is the shape I am working with...