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166 Appendix A– Setting Parameters
Trapping is a solution that solves misregistration between color
separations in both offset and digital printing. This occurs no
matter the accuracy of the printing device, and results in white
lines around objects on top of a background (in a knock-out
procedure) and also between adjacent colors.
Protect small text is an option you may apply for small or complex
images, since thicker frames can decrease quality by hiding parts
of an image. Selecting this option will protect any text smaller or
equal to 12 pt by not framing it while applying the FAF algorithm.
Frame thickness refers to the thickness of trapping. The thicker the
frame, the less chance that white areas appear between images.
Overprint
Black overprint
¾
Select this check box to ensure that black text prints cleanly
within a tint or picture area.
The text appears in a richer, deeper black, with the underlying CMY
values equal to those of the printed background.
PS overprint
¾
Select this check box to use the overprint information that
exists in the PostScript file.
This parameter also determines whether the DTP application
PostScript overprint settings are honored in the RIP.
Screening
¾
Select the required option. For CT images, use a dot option,
and for LW images, use a line option.
Screening converts CT (Continuous Tone) and LW (Line Work)
images into information (halftone dots) that can be printed. The
human eye “smooths out” this information, which seems visually
consistent with the original picture. Thus, the more lines per inch,
the more natural the image appears.
Screening is achieved by printing dots in numerous shapes or
lines in an evenly spaced pattern. The distance between the
screen dots or lines is fixed and determines the quality of the