Many PostScript language operators and programs now produce or consume data streams that can be encoded in various forms, usually for purposes of compression and/or for reliable transmission through seven-bit ASCII networks. Such data sources are defined in terms of filters that perform some kind of transformation on an incoming or outgoing data stream. A filter is in fact a special kind of file object. The semantics of filters expand the definition of files in the following way: the data target or data source of a filter can be a string or a procedure, not just a file such as current file or a disk file. In the case of a string, the filter simply writes bytes to, or reads bytes from, the string. This document is written for software developers who are interested in learning about filters and reusable streams or adding these capabilities to an application that supports PostScript display or printing devices.
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