Adobe InDesign CS5 - Manual (Page 498)

492 USING INDESIGN
Trapping color
Last updated 11/16/2011
To maximize the time your computers are available for other tasks, consider using Adobe In-RIP Trapping, which
processes all traps at the RIP, instead of at your computer.
Setting aside disk space for built-in trapping
To trap the edges of every color that requires trapping, the trapping engine creates a large number of paths that are
used only by the output device (the paths are not stored in your document). While Adobe In-RIP Trapping processes
and stores these additional paths at the RIP, built-in trapping uses your computer’s hard disk as a temporary storage
area for these trap paths. Before you use built-in trapping, make available as much hard disk space as possible.
The amount of disk space you’ll need depends on a wide range of factors, so it isn’t possible to predict exactly what a
particular trapping job will require. However, disk space requirements are most likely to increase when one or more
of the following characteristics of your document increase:
• Number of pages included in trapping page ranges.
• Number of overlapping color objects.
• Number of images that need to be trapped.
• Amount of text that needs to be trapped.
• Resolution of final output.
If the processing of a job that uses built-in trapping is interrupted or exhausts your disk space, trapping data may
be left behind on your hard disk. When necessary, you can exit the application, and then find and delete temporary
data in the C:\Temp folder (Windows). In Mac
OS, restart your computer.
Trap a document or book
Do not change the default trapping settings unless you’ve consulted with your prepress service provider, and you
understand how trapping options work in the context of your specific document and printing conditions.
When trapping multiple documents in a book, make sure that you assign any custom trap presets to page ranges within
the individual documents of the book. You cannot assign trapping settings to an entire book at once. However, you
can resolve conflicting presets in a document.
1 If necessary, create a trap preset with custom settings for your document and press conditions.
2 Assign the trap preset to a page range.
3 Choose File > Print to open the Print dialog box.
4 Select Output from the list on the left.
5 For Color, choose either Separations or In-RIP Separations, depending on whether you’re creating on-host or
in-RIP separations.
6 For Trapping, choose one of the following options:
• Application Built-In, to use the trapping engine included with InDesign.
• Adobe In-RIP. This option works only when you target an output device that supports Adobe In-RIP Trapping.
7 If your prepress service provider recommends changing ink settings, click Ink Manager. Select an ink, set the
options specified by your prepress service provider, and then click OK:
8 Continue specifying other print options, and then click Print to print your document.