Trapping - Adobe PAGEMAKER 6.5 Training Manual

Prepress Fundamentals
PageMaker 6.5 Advanced

Trapping

• Trapping refers to when
you apply a slight overlap
of colors in order to stop
any spaces from
happening while printing -
just in case paper shifts,
stretches or plate
misalignment occurs.
1. Green is Chocked to Trap
the Red.
2. Red is Spread to Trap the
Green.
3. No trapping used.
© Cheltenham Computer Training 2002
Using •
Trapping - applying a slight overlap of colors in order to stop any
Trapping
spaces from occurring while printing, in case a paper shift, stretch or
Terms
plate misalignment occurs. The principle is that trapping is applied to
a piece, based on how an object's color blends with the background
color of another item.
•
Overprint - mixing colors by printing a colored object in the
foreground prints completely over a colored object in the background.
This is used when black is the foreground color
OR if you want to intentionally mix colors to create a new third
color.
•
Knockout - removing a colored object in the foreground from the
background color to stop the inks from overprinting. This can cause
a gap between the foreground and background color edges, and
trapping will close the gap.
•
Spread - a method of trapping used when colors are knocked out
and the foreground color turns out to be lighter than the background.
The foreground color object has its edges enlarged a little bit to have
the foreground color spread out into the background color when at
press.
•
Choke - a method of trapping used when the foreground color is
darker than the background (opposite to the Spread method). The
background color object has its edges reduced a little bit to have the
background color spread into, or choke, the foreground color.
 Cheltenham Computer Training 1995-2002 - www.cctglobal.com
Trapping
FOR USE AT THE LICENSED SITE(S) ONLY
 2002 Cheltenham Computer Training
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Adobe PageMaker 6.5 - Slide No 30
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