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                                                  286
      CHAPTER 4                                                                       Graphics



         15 0 obj                                              % Tint transformation function
             << /FunctionType 4
                  /Domain [ 0.0 1.0 0.0 1.0 0.0 1.0 ]
                  /Range [ 0.0 1.0 0.0 1.0 0.0 1.0 0.0 1.0 ]
                  /Length 13
             >>
         stream
             { 0 exch }
         endstream
         endobj

      Nonzero overprint mode applies only to painting operations that use the current
      color in the graphics state when the current color space is DeviceCMYK (or is im-
      plicitly converted to DeviceCMYK; see “Implicit Conversion of CIE-Based Color
      Spaces” on page 259). It does not apply to the painting of images or to any colors
      that are the result of a computation, such as those in a shading pattern or conver-
      sions from some other color space. It also does not apply if the device’s native col-
      or space is not DeviceCMYK; in that case, source colors must be converted to the
      device’s native color space, and all components participate in the conversion,
      whatever their values. (This is shown explicitly in the alternate color space and
      tint transformation function of the DeviceN color space in Example 4.22.)

      See Section 7.6.3, “Overprinting and Transparency,” for further discussion of the
      role of overprinting in the transparent imaging model.


4.5.7 Color Operators

      Table 4.24 lists the PDF operators that control color spaces and color values. (Also
      color-related is the graphics state operator ri, listed in Table 4.7 on page 219 and
      discussed under “Rendering Intents” on page 260.) Color operators may appear at
      the page description level or inside text objects (see Figure 4.1 on page 197).

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