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Table Of Contents
Color-specific trapping values you specify in the Trap Specifications dialog box
directly affect color relationships and override all default trapping preferences.
A
spread occurs when items with a lighter color enlarge slightly to overlap a
darker background color. A
choke occurs when items with a darker color are
trapped by a slight reduction in the size of the “knocked out” area in a lighter
background color.
BACKGROUND COLOR (COLUMN)
Trap Specifications dialog box
The Background Color column displays all the colors defined for the project,
with the exception of White, Registration, and the object color. When the
object color is placed against a background of more than one color with
which the object color has conflicting trapping relationships or against a
color QuarkXPress is unable to identify, the program traps according to the
value specified for the
Indeterminate background color.
TRAP (DROP-DOWN MENU)
Trap Specifications dialog box
The Trap drop-down menu determines the trapping relationship when the
selected
Background Color occurs behind the object color selected in the
Default Colors dialog box. The Trap column displays the current setting.
Entries different from the default values are marked with an asterisk (*).
Trap drop-down menu
The Default option works like the Auto Amount (+/–) settings, but when
Default is chosen, an algorithm determines which colors choke, which colors
spread, and which colors overprint or knock out. The amount of a choke or
spread is based on the
Auto Amount value specified in the Trapping pane of
the
Preferences dialog box (QuarkXPress Server Þ Preferences). However,
when
Default is chosen, black always overprints and white always knocks out.
The
Overprint option specifies that the object color named in the dialog
box title overprints the selected background color in all instances where the
shade value of the object color is greater than the percentage entered in the
Overprint Limit field of the Trapping pane of the Preferences dialog box
(QuarkXPress Server Þ Preferences).
COLORS
CHAPTER 2: THE QUARKXPRESS SERVER USER INTERF
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