ORIS PDF Tuner Version 4.4.8 User Manual - image2output - Support

Trapping area
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Trapping
Trapping Individual Layers Manually
Specify the size of the trap area using the slider or input box. The selected
separations are increased (spread) or decreased (choked) within this
area.
If the trapping mode is CENTER, the trap area is divided equally between
the separations that are spread and those that are choked. If the trap
area is 0.3 mm and you have selected CYAN, for example, the Cyan separation
is spread by 0.15 mm and the Magenta, Yellow and Black separations
are choked by 0.15 mm.
Note:
The trap area should not be wider than the thinnest line on the layout.
Mode
Choose one of the following options to determine the way the activated
layers are trapped (see also Fig. 18-2 below):
CHOKE
The color separations you have checked are reduced by the size of
the trap area. If you choke Cyan, for example, the Cyan separation of
layers located below the activated layers shows through within the
trap area (provided that these layers extend into the trap area).
SPREAD
The color separations you have checked are enlarged by the size of
the trap area. Thus these separations overlap layers which are located
below the layers you are trapping.
Note:
CENTER
The color separations you have checked are enlarged by half of the
trap area size, the other separations are reduced by half of the trap
area size. This means that the activated layers are both spread and
choked.
Layer corners are rounded off if this setting is selected.
Guidelines
Use the following guideline to decide whether to choke or spread a layer:
• Light layer on dark layer: spread the light layer
• Dark layer on light layer: choke the dark layer
To preserve the shape of a trapped layer, you should always spread or
choke the lighter color separations.
ORIS PDF Tuner Version 4.4.8 User Manual 18-3
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