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10.1. Procedure Sets

The PDF operators used in content streams are grouped into categories of related operators called procedure sets (see Table 10.1). Each procedure set corresponds to a named resource containing the implementations of the operators in that procedure set. The ProcSet entry in a content stream's resource dictionary (see Section 3.7.2, “Resource Dictionaries”) holds an array consisting of the names of the procedure sets used in that content stream. These procedure sets are used only when the content stream is printed to a PostScript output device. The names identify PostScript procedure sets that must be sent to the device to interpret the PDF operators in the content stream. Each element of this array must be one of the predefined names shown in Table 10.1. (See implementation note 153 in Appendix H.)

Table 10.1. Predefined procedure sets
NAMECATEGORY OF OPERATORS
PDFPainting and graphics state
TextText
ImageBGrayscale images or image masks
ImageCColor images
ImageIIndexed (color-table) images



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