Dear Nick,
You might have to make a 5x7 box in illustrator and place in over your Photoshop image.
With the box selected, go under Effects and choose Crop Marks. This will create black crop marks.
To make them white, select them and the box and choose Expand Appearance under Object. Then
you can make the lines white. I hope this helps!
Take care,
Wendy
Wendy Beth Jackelow, MFA, CMI
Medical & Scientific Illustration
266 Pelton Avenue
Staten Island, NY 10310
Tel/fax (718) 273-0002
[log in to unmask]http://www.wbjackelowstudios.com
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