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I am trying to print some family photos onto 15 x 10 cm paper to fit in a multi cutout frame.  The frame cutouts (which are labelled as 15 x 10) are 13.7 x 8.8 cm, to allow the paper to sit behind the cutout without falling out. What I want to do is to set the printer to 15 x 10 paper, but guarantee that the subject is showing completely in the cutout.  I realise that I need to leave some space around the subject to allow for this, but is there any way of superimposing a ruler on the image to check that the subject will be completely showing, without having it smaller than necessary?  I am using the latest version of Photoshop.

Derek