CHAPTER 4
268
Graphics
Example 4.11
5 0 obj
[ /Separation
/LogoGreen
/DeviceCMYK
12 0 R
]
endobj
12 0 obj
<< /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
% Color space
% Tint transformation function
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