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       SECTION 4.3                                                              Graphics State



KEY     TYPE               DESCRIPTION

OP      boolean            (Optional) A flag specifying whether to apply overprint (see Section 4.5.6,
                           “Overprint Control”). In PDF 1.2 and earlier, there is a single overprint
                           parameter that applies to all painting operations. Beginning with PDF 1.3,
                           there are two separate overprint parameters: one for stroking and one for all
                           other painting operations. Specifying an OP entry sets both parameters un-
                           less there is also an op entry in the same graphics state parameter dictionary,
                           in which case the OP entry sets only the overprint parameter for stroking.

op      boolean            (Optional; PDF 1.3) A flag specifying whether to apply overprint (see Section
                           4.5.6, “Overprint Control”) for painting operations other than stroking. If
                           this entry is absent, the OP entry, if any, sets this parameter.

OPM     integer            (Optional; PDF 1.3) The overprint mode (see Section 4.5.6, “Overprint Con-
                           trol”).

Font    array              (Optional; PDF 1.3) An array of the form [ font size ], where font is an indirect
                           reference to a font dictionary and size is a number expressed in text space
                           units. These two objects correspond to the operands of the Tf operator (see
                           Section 5.2, “Text State Parameters and Operators”); however, the first oper-
                           and is an indirect object reference instead of a resource name.

BG      function           (Optional) The black-generation function, which maps the interval [ 0.0 1.0 ]
                           to the interval [ 0.0 1.0 ] (see Section 6.2.3, “Conversion from DeviceRGB to
                           DeviceCMYK”).

BG2     function or name   (Optional; PDF 1.3) Same as BG except that the value may also be the name
                           Default, denoting the black-generation function that was in effect at the start
                           of the page. If both BG and BG2 are present in the same graphics state param-
                           eter dictionary, BG2 takes precedence.

UCR     function           (Optional) The undercolor-removal function, which maps the interval
                           [ 0.0 1.0 ] to the interval [ −1.0 1.0 ] (see Section 6.2.3, “Conversion from
                           DeviceRGB to DeviceCMYK”).

UCR2    function or name   (Optional; PDF 1.3) Same as UCR except that the value may also be the name
                           Default, denoting the undercolor-removal function that was in effect at the
                           start of the page. If both UCR and UCR2 are present in the same graphics state
                           parameter dictionary, UCR2 takes precedence.

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