Trap Presets


can give me explanation trap presets option in indesign cs4
this option not in indesign cs2 or 3.
what option pdf when created.
with default of black @ overprint , trap set knockout on else, why need option trap?
i used indesign section explanation, not understand
why want option when trap default set.

adobe support said user may want use trap preset option manually set , apply trap,for special effect on images , objects, making larger or smaller default trap settings automatically applied within program.


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