Quick links to procedures on this page:
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.
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Choose PostScript 3 from the Compatibility list box. |
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Enable the PostScript level 3 In-RIP trapping check box. |
To select In-RIP trapping options, you must have selected PostScript 3 from the Compatibility list box under the PostScript tab of the Print dialog box.
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Choose PostScript 3 from the Compatibility list box. |
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Enable the PostScript Level 3 In-RIP trapping check box. |
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From the Image trap placement list box, choose one of the following placements: |
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Neutral density — used to determine the lighter object and thus the direction and placement of the trap |
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Choke — used to trap a dark foreground object to a light background image |
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Spread — used to trap a light foreground object to a dark background image |
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Centerline — used when adjacent images and objects have similar neutral densities or when image density changes along an object’s edge |
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Choose PostScript 3 from the Compatibility list box. |
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Enable the PostScript 3 In-RIP trapping check box. |
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Step limit — specifies a threshold between color variations. The lower the threshold value, the more likely it is that a trap will be created. |
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Black limit — specifies the threshold at which process black is considered pure black |
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Sliding trap limit — specifies the difference between the neutral densities of adjacent colors at which a trap adjusts (slides) from the darker side of a color edge toward the centerline. The lower the sliding trap limit, the more gradual the transition. |
To choose In-RIP trapping options, you must have selected PostScript 3 from the Compatibility list box under the PostScript tab in the Print dialog box.
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Enable the PostScript Level 3 In-RIP trapping check box. |
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Transparent — the selected ink doesn’t get trapped, but anything beneath it does |
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Neutral density — the neutral density of the selected ink determines how it is treated |
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Opaque — the selected ink is treated as opaque |
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Opaque ignore — the selected ink doesn’t get trapped nor does anything beneath it |
To choose In-RIP trapping options, you must have selected PostScript 3 from the Compatibility list box under the PostScript tab in the Print dialog box.
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Enable the PostScript 3 In-RIP trapping check box. |
A reduction value of 100% indicates no reduction, while a lower value reduces the neutral density.
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