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Improve the quality of printed iPhoto books
To confuse matters even more, most printing does quite use the same concept of DPI as your screen. Most printing is measured using "lines per inch," or line screen. This is because in printing, individual colors are are created by overlaying grids of dots made from primary ink colors, usually cyan, magenta, yellow and black. A typical laserprinter of 600dpi can print a line screen of 65 or so (some more, depending on the unit). Anyway, why does this matter? In printing, the SIZE of the dots often can vary (halftoning), so that the idea of a fixed grid of dots is thrown out the window. It is counterintuitive, but in many cases a lower line screen can produce more subtle transitions between shades of color (think blue sky), at the expense of finer detail. The upshot is that, depending on the process and paper used, messing with the line screen can dramatically alter the result, and higher is not necessarily better. So, tinker with these settings at your own risk. I'd be very interested hearing from someone willing to print out the exact same book twice with different settings.
Improve the quality of printed iPhoto books
While you're correct about line screen (for which you should usually supply 1.5 times the LPI in the DPI of your image for best result and most efficient processing in the RIP), the Apple books are printed digitally. |
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