7.0

Even with Overprint specified, overprinting occurs only when an object
color has a shade value greater than the
Overprint Limit value specified in
t
he
T
rapping
p
ane of the
P
references
d
ialog box
(
QuarkXPress Server
Þ
Preferences).
• The
Knockout option specifies that the object color named in the dialog box
title knocks out the selected background color using no trapping.
• The Auto Amount (+) option assigns the default spread value (the value
specified in the
Auto Amount field of the Trapping pane of the Preferences
dialog box) to the object color named in the dialog box title.
• The
Auto Amount (–) option assigns the default choke value (the negative
of the value specified in the
Auto Amount field of the Trapping pane of the
Preferences dialog box) to the object color named in the dialog box title.
• The
Custom option displays the Custom dialog box, which enables you to
specify a custom trapping value for the object and background color. Enter a
value and click
OK. A negative value causes the background color to choke.
A positive value causes the object color to spread. A value of zero knocks out
the object from the selected background color with no trapping.
RANGE MEASUREMENT SYSTEM SMALLEST INCREMENT
±36pt points .001
If you specify a negative Custom value between the object color named in
the dialog box title and the
Indeterminate background color, text to which
the object color is applied is not choked; instead, it is knocked out of the
background without any trapping.
DEPENDENT/INDEPENDENT (DROP-DOWN MENU)
Trap Specifications dialog box
The Dependent Traps/Independent Traps drop-down menu determines
whether the
Trap and Reverse drop-down menu settings directly affect each
other. The
Reverse column indicates how trapping occurs when the selected
Background Color takes on the role of object color and vice versa.
Dependent/Independent drop-down menu
•
Choose
Dependent T
raps
for QuarkXPress Ser
ver to calculate a reverse trap
value automatically.
•
Choose
Independent T
raps
to specify a custom reverse trap value.
COLORS
74
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CHAPTER 2: THE QUARKXPRESS SERVER USER INTERF
ACE