Adobe ACROBAT 3D Manual page 612

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Setting trap thresholds

You can adjust trap thresholds, as recommended by your prepress service provider, to

correspond to your printing conditions. Trap thresholds are available for the following

color conditions:

Step indicates the degree to which components (such as CMYK values) of abutting colors

must vary before Acrobat creates a trap. Type a value from 1% to 100%, or use the default

of 10%. For best results, use a value from 8% to 20%. Lower percentages increase

sensitivity to color differences and result in more traps.

Black Color indicates the minimum amount of black ink required before the Black trap

width setting is applied. Type a value from 0% to 100%, or use the default of 100%. For

best results, use a value no lower than 70%. (See

Trapping with black and rich

Black Density indicates the neutral density value at or above which Acrobat considers an

ink to be black. For example, if you want a dark spot ink to use the Black trap width

setting, enter the neutral density value here. Use any value from .001 to 10, but this value

is typically set near the default of 1.6.

Sliding Trap indicates the percentage difference (between the neutral densities of abutting

colors) at which the trap is moved from the darker side of a color edge toward the

centerline, to create a more elegant trap. (See

Using sliding

Trap Color Reduction indicates the degree to which Acrobat uses components from

abutting colors to reduce the trap color. This is useful for preventing certain abutting

colors (such as pastels) from making an unsightly trap that is darker than either color.

Specifying a Trap Color Reduction lower than 100% begins to lighten the color of the

trap; a Trap Color Reduction value of 0% makes a trap whose neutral density is equal to

the neutral density of the darker color.

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