Xerox 242 补充手册
188
Chapter 8 – Setting Parameters
•
Text/Line in images improves the resolution of text and line-art in images—
for example, scanned images or screen captures
for example, scanned images or screen captures
Image Quality
The
Image quality parameter controls the ability to maintain the same detail and
smoothness at different degrees of enlargement. This feature is especially useful
when your PostScript file includes several images of different qualities—for
example, images that were scanned at different resolutions, were rotated, or were
downloaded from the Internet.
when your PostScript file includes several images of different qualities—for
example, images that were scanned at different resolutions, were rotated, or were
downloaded from the Internet.
1.
Select
High to improve the quality of images in a job.
2.
In the
Enhance area, select the Graphics check box to improve the quality of
overlapping vector and image elements.
Trapping
Trapping is a solution that solves misregistration between color separations in both
offset and digital printing. Misregistration occurs regardless of 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. Trapping extracts the
element or the background in order to create an overlap between them.
offset and digital printing. Misregistration occurs regardless of 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. Trapping extracts the
element or the background in order to create an overlap between them.
1.
To set trapping, select
Yes.
2.
In the
Frame Thickness box, select the default (0.08mm) for the thickness of
the trapping frame, or type the desired value. The thicker the frame, the less
chance that white areas appear will between images.
chance that white areas appear will between images.
3.
Do one of the following actions:
•
Select the
Protect Small Text check box to prevent the trapping of any text
that is 12 points or smaller.
•
Clear the
Protect Small Text check box to trap all text elements.
Black Overprint
¾ Select Yes 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.
those of the printed background.
Note: When you select
High, the processing speed is decreased.
Notes:
•
If you select
Yes
, the
Frame Thickness
and
Protect Small Text
options are activated. You cannot select these options in the PPD file.
•
If you select
No
, trapping incorporated by DTP applications (for example,
Photoshop
®
) are not affected. Creo Full Auto Frame trapping software
(FAF) should not be used with application-based trapping. In a PostScript
file that already contains trapping from the originating application, it is
not necessary to use Spire CX260 trapping.
file that already contains trapping from the originating application, it is
not necessary to use Spire CX260 trapping.
Tip: Apply the
Protect Small Text option to small or complex images to
ensure their quality is not decreased.