Operation Manual

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3 Choose Overprint black threshold (PS) from the Option list.
4 Choose a number from the Setting list box.
The number you choose represents the percentage of black above which black objects overprint.
To trap by auto-spreading
1
Click File Print.
2 Click the Color tab.
3 Choose one of the following options:
• Print composite
• Print separations
4 Click one of the following tabs:
• Separations
• Composite
5 In the PostScript trapping or Trapping area, do one of the following:
• Enable the Auto-spreading option, and type a value in the Maximum box.
• Enable the Fixed width option, and type a value in the Width box.
6 Type a value in the Text above box.
The value that you type in the Text above box represents the minimum size to which auto-spreading is applied. If you set this value
too low, small text may be rendered illegible when auto-spreading is applied.
The amount of spread assigned to an object depends on the maximum trap value specified in the Maximum box and the object’s
color. The lighter the color, the greater the percentage of the maximum trap value. The darker the color, the smaller the percentage of
the maximum trap value.
Specifying In-RIP trapping settings
In-RIP trapping allows you to specify advanced trapping settings. Before selecting In-RIP trapping, ensure that your PostScript 3 printer
supports In-RIP trapping options.
You can select a trap width — the amount that one color spreads into another. You can also specify image trap placement, which
determines where the trap occurs. You can, for example, specify whether the trap is a choke or a spread, depending upon the neutral
densities of adjacent colors. Neutral density indicates the lightness or darkness of a color and helps determine how adjacent colors spread
into one another.
You can specify a threshold at which a trap is created by specifying a step trap limit. If trap colors are of similar neutral densities, the trap
placement adjusts accordingly. The step trap limit specifies a threshold at which a trap adjusts.
Before trapping, you can set the inks; for example, you can set an ink to opaque, as in the case of a metallic ink, so that nothing shows
through it. To reduce the visibility of a trap, you can decrease the amount of ink color in a trap. This is especially helpful in the case of pastel
colors, contrasting colors, and colors with similar neutral densities.
To select a trap width
1
Click File Print.
2 Click the Color tab.
3 Enable the Print composite option.
4 Click the PostScript tab.
5 Choose PostScript 3 from the Compatibility list box.