Pixels, PPI, DPI, and LPI for Scanning, Printing, and Web Publishing. CSC361/661 Digital Media Spring 2002 Burg/Wong. A Pixel . A pixel on your computer monitor is a point of light What is the maximum resolution of your monitor? Probably 1024 X 768
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Half-Tone Dots Publishing
Each line printed out by a laser printer is a series of half-tone dots. For a grayscale picture, a half-tone dot looks more or less gray depending on how many primitive dots it is composed of.
From p. 59, Avoiding the Scanning Blues by Taz Tally, Prentice-Hall Publishers, 2001.
(p. 44, Avoiding the Scanning Blues)
Experience shows that a good rule of thumb is to scan at a resolution that is 1.5 to 2 times the lpi of the laser printer you’ll be printing on.