Previous Next

                                          268
CHAPTER 4                                                                     Graphics



Example 4.11

  5 0 obj                                              % Color space
     [ /Separation
           /LogoGreen
           /DeviceCMYK
           12 0 R
     ]
  endobj

  12 0 obj                                             % Tint transformation function
      << /FunctionType 4
          /Domain [ 0.0 1.0 ]
          /Range [ 0.0 1.0 0.0 1.0 0.0 1.0 0.0 1.0 ]
          /Length 62
      >>
  stream
      { dup 0.84 mul
        exch 0.00 exch dup 0.44 mul
        exch 0.21 mul
      }
  endstream
  endobj

See Section 7.6.2, “Spot Colors and Transparency,” for further discussion of the
role of Separation color spaces in the transparent imaging model.


DeviceN Color Spaces

DeviceN color spaces (PDF 1.3) can contain an arbitrary number of color compo-
nents. They provide greater flexibility than is possible with standard device color
spaces such as DeviceCMYK or with individual Separation color spaces. For ex-
ample, it is possible to create a DeviceN color space consisting of only the cyan,
magenta, and yellow color components, with the black component excluded.

DeviceN color spaces are used in applications such as these:

• High-fidelity color is the use of more than the standard CMYK process colo-
  rants to produce an extended gamut, or range of colors. A popular example is

Previous Next