I am trying to insert crop marks into my document but am obviously doing something wrong. I have an image that is 10.253 inches x 7.253 inches. I want to have the image cropped to 10 inches x 7 inches.

I go to: File, print with preview
Click on the output drop down menu
mark off "corner crop marks"
under position for top and left I insert .253
This however, does not give me crop marks at 10 inches x 7 inches. What am I doing wrong?

Thanks

Elizabeth