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3.3. Filters

Stream filters are introduced in Section 3.2.7, “Stream Objects.” A filter is an optional part of the specification of a stream, indicating how the data in the stream must be decoded before it is used. For example, if a stream has an ASCIIHexDecode filter, an application reading the data in that stream will transform the ASCII hexadecimal-encoded data in the stream into binary data.

An application program that produces a PDF file can encode certain information (for example, data for sampled images) to compress it or to convert it to a portable ASCII representation. Then an application that reads (consumes) the PDF file can invoke the corresponding decoding filter to convert the information back to its original form.


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