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So I've done extensive Googling on this and I'm just going to have to ask you Photoshop Gurus.

A client of mine sends me images in different pixel sizes and different resolutions. In the end, the photos are delivered in a size that is almost square, at either 72 or 300 DPI. The client wants margin lines (rulers) at 5% of the image left and right and 2.5% of the image top and bottom. This is what that looks like:

[ATTACH]50014[/ATTACH]

This image is 2230 x 2326, 300 DPI.

I'd like to create an action that automatically creates the margin lines at the right spots, but I can't figure out how. The problem of course being that the images always differ in size and resolution. Any ideas? I'd REALLY appreciate the help, this is taking up too much of my time.