Adobe INDESIGN 2.0 - USING HELP Help Manual page 325

Adobe InDesign Help
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you might choose Object > Clipping Path to fit the graphics frame more tightly around
the graphic.
InDesign text and graphics that overlap placed graphics (left) won't trap correctly;
to achieve good trapping, reshape the frame so that it doesn't touch other objects (right)
About trapping text
Both the Adobe In-RIP and built-in trapping engines can trap text characters to other text
and graphics (as long as they are placed directly on the layout, and aren't contained in
imported graphics). A text character overlapping different background colors traps
accurately to all of the colors.
For best results with built-in trapping, use Type 1 fonts only; using TrueType fonts may
result in inconsistent traps. Neither trapping engine traps bitmap fonts. If your document
must use TrueType fonts and you want to use built-in trapping, consider converting all
TrueType text to outlines by selecting the text and choosing Type > Create Outlines. The
text will become InDesign objects that do trap reliably. Remember, though, that text can't
be edited after you convert it to outlines.
Maximizing trapping performance
Whether you use Adobe In-RIP trapping or built-in trapping, you can save time by not
processing pages that don't need trapping, such as pages containing black text only. You
can use trap styles to enable trapping only for the page ranges that require it; for more
information, see "Assigning a trap style to pages" on page
The speed with which built-in trapping is accomplished depends on the speed of your
computer system. If you're trapping every page of a long document, use the fastest
computer system you have. Built-in trapping also makes extensive use of your computer's
hard disk, so a fast hard disk and data bus will benefit the built-in trapping engine. 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 which 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:
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