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CHA P TE R 4
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Set the stroking color space to DeviceCMYK (or the DefaultCMYK color space; see Default Color Spaces on page 194) and set the color to use for stroking operations Each operand must be a number between 00 (zero concentration) and 10 (maximum concentration) The behavior of this operator is affected by the overprint mode (see Section 456, Overprint Control ) Same as K, but for nonstroking operations
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In certain circumstances, invoking operators that specify colors or other colorrelated parameters in the graphics state is not allowed This restriction occurs when de ning graphical gures whose colors are to be speci ed separately each time they are used Speci cally, the restriction applies:
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In any glyph description that uses the d1 operator (see Section 554, Type 3
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In the content stream of an uncolored tiling pattern (see Uncolored Tiling
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Patterns on page 227) In these circumstances, the following will cause an error:
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Invoking any of the following operators:
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CS cs SC SCN sc scn G g RG rg K k ri sh
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Invoking the gs operator with any of the following entries in the graphics state
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parameter dictionary:
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page 276) is permitted, because it does not specify colors, but rather designates places where the current color is to be painted
S E CTIO N 4 6
Patterns
46 Patterns
When operators such as S (stroke), f ( ll), and Tj (show text) paint an area of the page with the current color, they ordinarily apply a single color that covers the area uniformly However, it is also possible to apply paint that consists of a repeating graphical gure or a smoothly varying color gradient instead of a simple color Such a repeating gure or smooth gradient is called a pattern Patterns are quite general, and have many uses; for example, they can be used to create various graphical textures, such as weaves, brick walls, sunbursts, and similar geometrical and chromatic effects (See implementation note 33 in Appendix H) Patterns come in two varieties:
Tiling patterns consist of a small graphical gure (called a pattern cell) that is
replicated at xed horizontal and vertical intervals to ll the area to be painted The graphics objects to use for tiling are described by a content stream
Shading patterns de ne a gradient ll that produces a smooth transition
between colors across the area The color to use is speci ed as a function of position using any of a variety of methods Note: The ability to paint with patterns is a feature of PDF 12 (tiling patterns) and PDF 13 (shading patterns) With some effort, it is possible to achieve a limited form of tiling patterns in PDF 11 by de ning them as character glyphs in a special font and painting them repeatedly with the Tj operator Another technique, de ning patterns as halftone screens, is not recommended, because the effects produced are device-dependent Patterns are speci ed in a special family of color spaces named Pattern, whose color values are pattern objects instead of the numeric component values used with other spaces A pattern object may be a dictionary or a stream, depending on the type of pattern; the term pattern dictionary is used generically throughout this section to refer to either a dictionary object or the dictionary portion of a stream object (Those pattern objects that are streams are speci cally identi ed as such in the descriptions of particular pattern types; unless otherwise stated, they are understood to be simple dictionaries instead) This section describes Pattern color spaces and the speci cation of color values within them; see Section 45, Color Spaces, for information about color spaces and color values in general, and Section 756, Patterns and Transparency, for further discussion of the treatment of patterns in the transparent imaging model
CHA P TE R 4
Graphics
461 General Properties of Patterns
A pattern dictionary contains descriptive information de ning the appearance and properties of a pattern All pattern dictionaries contain an entry named PatternType, whose value identi es the kind of pattern the dictionary describes: type 1 for a tiling pattern or type 2 for a shading pattern The remaining contents of the dictionary depend on the pattern type, and are detailed below in the sections on individual pattern types All patterns are treated as colors; a Pattern color space is established with the CS or cs operator just like other color spaces, and a particular pattern is installed as the current color with the SCN or scn operator (see Table 421 on page 216) A pattern s appearance is described with respect to its own internal coordinate system Every pattern has a pattern matrix, a transformation matrix that maps the pattern s internal coordinate system to the default coordinate system of the pattern s parent content stream (the content stream in which the pattern is de ned as a resource) The concatenation of the pattern matrix with that of the parent content stream establishes the pattern coordinate space, within which all graphics objects in the pattern are interpreted For example, if a pattern is used on a page, the pattern will appear in the Pattern subdictionary of that page s resource dictionary, and the pattern matrix maps pattern space to the default (initial) coordinate space of the page Changes to the page s transformation matrix that occur within the page s content stream, such as rotation and scaling, have no effect on the pattern; it maintains its original relationship to the page no matter where on the page it is used Similarly, if a pattern is used within a form XObject (see Section 49, Form XObjects ), the pattern matrix maps pattern space to the form s default user space (that is, the form coordinate space at the time the form is painted with the Do operator) Finally, a pattern may used within another pattern; the inner pattern s matrix de nes its relationship to the pattern space of the outer pattern Note: PostScript allows a pattern to be de ned in one context but used in another For example, a pattern might be de ned on a page (that is, its pattern matrix maps the pattern coordinate space to the user space of the page) but be used in a form on that page, so that its relationship to the page is independent of each individual placement of the form PDF does not support this feature; in PDF, all patterns are local to the context in which they are de ned