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Hints are instructions built into outline fonts that enable character shapes, especially subtle curves printed at small point sizes and low resolutions, to print as close to the designed character shape as possible. TrueType fonts contain complex hinting information. TrueType fonts can hint each character, different sizes of a character, and rotated text.
At its most basic level hinting (or, more accurately, instructing) a font is a method of defining exactly which pixels are turned on in order to create the best possible character bitmap shape at small sizes and low resolutions. Since it is a glyph's outline that determines which pixels will constitute a character bitmap at a given size, it is often necessary to modify the outline to create a good bitmap image; in effect modifying the outline until the desired combination of pixels is turned on. A hint is a mathematical instruction added to the font to distort a character's outline at particular sizes. Technically, hints result in operations which modify a contours' scaled control point coordinates before the outline is scan converted.
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