A character designated for use if the requested character does not exist in a font character set or a font encoding . The substitution is carried out by an algorithm built into the application. Unicode being the exceptions. The opposite is a soft font , which must be downloaded at the time of use. A measurement of how precisely a pixel-based output device can reproduce an image.
Resolution can be different horizontally and vertically.
In that case, two numbers should be specified. Early computer screens had resolutions of 72 dpi, but screens have been introduced which can produce up to 200 dpi. Imagesetters range from 1000 to 4800 dpi. Film recorders range from 1200 to 16,000 dpi. Resolution can actually be defined in several ways.