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Improve the quality of printed iPhoto books
Lines per inch (LPI) is the key to knowing the ideal dots per inch (DPI) for a given output device. Most book or magazine quality publications are either 150 or 175 LPI. A good rule of thumb is that nothing is to be gained from having the DPI of your photos beyond 1.5 to 2 times the LPI. So for 150 LPI, you don't need more than 225-300 DPI. For 175 LPI, you don't need more than 270-350 DPI. In both cases, 300 DPI is a good safe number. Without knowing the LPI of the printing press the iPhoto books are printed at, we just have to guess.
Improve the quality of printed iPhoto books
For the curious, I will explain my statement: "For full-page (8.5 x 11) pictures in a coffee-table book, you really need an 8-10 megapixel camera." |
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