Business and Legal Forms For Photographers, by Tad Crawford.
A 1200x1600 pixel image could be printed by a lab like Mpix as a 12x16 wall print at 100 ppi, 100 ppi is Mpix's minimum print resolution. They will refuse to print an image that is at 99 ppi or less.
If you don't want event clients printing much bigger than 4x6, size them to 400x600 pixels.
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Keith Harrod | Image Works
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