41
E x te rnal Plug - i ns pane l
The External Plug-ins panel summarizes the usage of any plug-ins which are not included
with the retail version of InDesign but were used in the document.
Trapping documents
Trapping in InDesign CS works by comparing colors at the ink level instead of at the object
level. This is clearly superior to object-based trapping because it can correctly address situa-
tions where an object contains multiple colors, such as a gradient, as well as objects that cross
over areas of different colors.
Trapping can be performed either by InDesign or using the Adobe In-RIP Trapping capa-
bility built into many Adobe PostScript 3 RIPs. Both approaches provide access to high-end
trapping controls you’d expect to find in post-processing trapping applications, such as the
ability to set trapping controls for text and rich blacks and to compensate for custom inks.
Adobe In-RIP Trapping fully traps objects created in InDesign as well as placed images.
Adobe InDesign built-in trapping also traps InDesign objects and placed images, but with
certain conditions. Adobe Illustrator files (native format or PDF, but not EPS) are trapped
if they were created by Adobe Illustrator 9 or later. PDF files can indicate whether they
have been previously trapped; Adobe InDesign traps them only if they were not previously
trapped.
Traps are visible only when you print color separations; you cannot see traps simulated
on-screen. You specify trapping settings by using the Trap Presets palette.
