If you have to resort to technology to differentiate, you are pursuing trivialities. You'd be surprised how accurately the human eye can differentiate between relative sizes and even colors. If it looks centered to your eye it is probably within tolerance for being considered 'centered'.
If you are worried about TPG submissions, that is another story. FWIW, when I was trying to handicap cards for a PSA submission I used a ruler with mm rule and it worked quite well in finding cards that had "9" level centering.
Last edited by Exhibitman; 12-03-2015 at 12:10 PM.
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