Adobe ACROBAT 3D, Manual

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Using output intents
An output intent is used for device-dependent workflows. It describes the final destination
device you will use to reproduce the color, whether that's your monitor, composite
proofing device, or final separations standard. Output intents override working spaces
when viewing and printing, but they do not convert the colors in the Adobe PDF
document.
There are two kinds of output intents: One includes an embedded device profile that
defines the color space of the destination device, such as U.S. Web Coated (SWOP) v2;
the other is a name that defines the destination color space and usually names a standard
output condition. Using a named output intent rather than an embedded profile helps
reduce the size of a PDF file.
If you open a PDF document with an output intent, the color space defined by the output
intent determines which working space (RGB, CMYK, or Grayscale) is used. If the
document includes more than one output intent, only the first one is used. For documents
with named output intents rather than embedded profiles, the program looks for the color
profile associated with the named intent. If the profile is unknown, the program displays a
message and ignores the output intent.
To include an output intent with an Adobe PDF file:
Use the PDF/X options in the Standards tab of Acrobat Distiller. (See Standards options .)
You can also use third-party plug-ins.
To use output intent color spaces rather than working spaces:
In the Color Management panel of the Preferences dialog box, select the option
OutputIntent Overrides Working Spaces.