CHAPTER 4
278
Graphics
where a spot colorant and a process color component have the same name. Since
the
names
array may not have duplicate names, the process colors should be given
different names, which are mapped to process components in the
Components
entry of the process dictionary. In this case,
Red
refers to a spot colorant;
ProcessRed
,
ProcessGreen
, and
ProcessBlue
are mapped to the components of an
RGB
color space.
Example 4.15
10 0 obj
% Color space
[ /DeviceN
[/ProcessRed /ProcessGreen /ProcessBlue /Red]
alternateSpace
tintTransform1
<<
% Attributes dictionary
/Subtype /NChannel
/Process
<< /ColorSpace [ /ICCBased
RGB_ICC profile
]
/Components [/ProcessRed /ProcessGreen /ProcessBlue]
>>
/Colorants
<< /Red [/Separation /Red
alternateSpace tintTransform2
] >>
>>
]
Example 4.16
10 0 obj
% Color space
[/DeviceN
[/Magenta /Spot1 /Yellow /Spot2]
alternateSpace
tintTransform1
<<
/Subtype /NChannel
/Process
<< /ColorSpace [ /ICCBased
CMYK_ICC profile
]
/Components [/Cyan /Magenta /Yellow /Black]
>>
/Colorants
<< /Spot1 [/Separation /Spot1
alternateSpace tintTransform2
]
/Spot2 [/Separation /Spot2
alternateSpace tintTransform2
]