8.5

Table Of Contents
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 >
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 > Preferences).
Even with Overprint specified, overprinting occurs only when an object color has a shade
value greater than the Overprint Limit value specified in the Trapping pane of the
Preferences dialog box (QuarkXPress Server > 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.
Smallest IncrementMeasurement SystemRange
.001points±36pt
A GUIDE TO QUARKXPRESS SERVER 8.5 | 43
THE QUARKXPRESS SERVER USER INTERFACE