CHAPTER 4
286
Graphics
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% Tint transformation function
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
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
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).