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The best quality will come from photos at 300 ppi/dpi (pixels per inch) so for a 640 × 480pixel photo that means it should be printed no bigger than 2.1" x 1.6". (just divide the pixel size by 300 to get the size of the best possible print) But BookSmart is fairly forgiving and will accept photos at 150ppi at the lowest. So if you scale your photos using the slider until the warning sign appears then decrease the size slightly until it just disappears they will be at 150ppi and you will get them to print at 4.2" x 3.2". But the quality will not be quite as good. With your photos being the size they are you are not going to be able to print them any bigger and get a decent quality print. That size is really geared towards displaying them on a web page or a mobile phone rather than as large prints in a book. Sorry. …..Tony
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