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Question: Will it scan really perfect from 4 x 6 picture

I am doing project that i am scanning thoursand of my dad's picture that he want it into the computer to make a beautiful slideshow with out less quality. He want it all in computer and safe it from surprise house burn down and burn all the album book with all pictures will be gone forever u know. so i am try to scan picture from my scanner but it not so quality it has line on it. So i would like to know more about it. bz i would like to use that cool scanner for my business to do that. Let me know soon.