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The desktop publishing point (DTP point) or PostScript point is defined as 1 ⁄ 72 or 0.013 8 of the international inch, making it equivalent to 25.4 ⁄ 72 mm = 0.352 7 mm. Twelve points make up a pica, and six picas make an inch. This specification was developed by John Warnock and Charles Geschke when they created Adobe PostScript.
10 Οκτ 2009 · What is a type size: What does 12-point (or 9, 10, or 72 point) mean? Point size is a measurement system that is a relic from when type was set as metal pieces. Points are just another unit like inches or centimeters, and are generally considered to be 1/72 of an inch.
The pica is a typographic unit of measure corresponding to approximately 1⁄6 of an inch, or from 1⁄68 to 1⁄73 of a foot. One pica is further divided into 12 points. In printing, three pica measures are used: The French pica of 12 Didot points (also called cicero) generally is: 12 × 0.376 = 4.512 mm (0.1776 in).
Comprised of 12 “Points,” Picas are still the standard measuring system for typography today, but many designers still prefer to use more widely accepted measurements such as inches and millimeters.
Picas are derived from the point measurement system, with one pica equivalent to 12 points. Picas are particularly useful for layout design, providing a more flexible unit for column widths, margins, and other spatial elements.
A pica is a hair less than 1/6 inch, and contains 12 points. Picas are typically used to represent fixed horizontal measurements, most often column width. They are commonly used when designing newspapers, magazines, newsletters, and ads. Picas are designated with the letter p, such as 16p.
The smallest and most common typographic unit of measure, the point is 1⁄72 of an inch or 1⁄12 of a pica. It was originally based on the size of the metal body on which characters were cast. If using pica-based measurements in InDesign, points are the number after the lowercase p.