Your title page inside the book will have the inside 1/4" in the binding (approximately). I think that is negligible (possibly unnoticeable by the eye), but if you really want it centered, center it with from 1/4" in from the left and 1/8" in from the right, that's the approximate trim amount. I think if it's off by 1/8" you wouldn't notice. I centered my title page on the page itself and I can't notice what's lost in reference to the binding.
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Sarah 
Equipment: Canon T2i (550D) with 18-55mm f/3.5-5.6, 55-250mm f/4-5.6, 50mm f/1.8, and 400mm f/5.6L lenses
Software: Windows 7, PSE 10 (Editor), PSE 6 (Organizer), and PSCS 4
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