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Adobe Creative Suite 5 Printing Guide 91
Overprint Preview
As mentioned in the earlier section, “Using the Attributes panel,”
Overprint Preview (View > Overprint Preview) can help you find
overprinting problems in Illustrator files. Because Overprint Preview
provides a more realistic display of transparency and blending modes, it
can also help you find problems that arise from using transparency with
spot-color objects. For example, a spot-color object set to Multiply with
another object using the same spot color may appear to darken the
underlying artwork. But, since there cannot be 200% of a single ink, the
display is misleading. Turning on Overprint Preview allows Illustrator to
more realistically represent final output.
Overprint Preview
Spot-color text set to Multiply appears to darken the area where it overlaps a rectangle using
the same spot color (top). But Overprint Preview provides a more realistic display (boom).
Because there cannot be 200% of the same ink (without a second plate), the overlapping
area will actually not be darker when printed.
Separations Preview
Use the Separations Preview feature to view individual plates, or to see
the document in progressive mode. Choose Window > Separations
Preview to open the Separations Preview Panel. Check the Overprint
Preview option in the panel to activate separations display. Use the
“eyeball” visibility controls next to the ink names to selectively display
separations in color. (There is no provision to display a separation in
black to resemble film or plate output.)
Separations Preview
Activate Separations Preview by checking the Overprint Preview box, then selectively display
the inks.
Separations Preview can enable you to easily identify problems such as
unintended overprinting content, objects not overprinting that should
be, rich black or Registration used inappropriately, and extraneous spot
colors. Finding such problems early in the life of a job can save money,
aggravation and deadlines.
Flattener Preview
Use the Flattener Preview (Window > Flattener Preview) to determine
how objects in the document will be affected if the file is flattened.
Flattening occurs when PostScript is generated by choosing File > Print,
by exporting to the Encapsulated PostScript (EPS) format, or by saving
the file as a PDF compatible with Acrobat 4.0 or earlier. The Flattener’s
purpose is to show areas affected by transparency flattening so you can
modify the file or choose another flattener preset if necessary to control
flattening results before output.
To use the Flattener Preview features:
1. Choose Window > Flaener Preview. If you don’t see all options,
choose Show Options from the panel menu.
2. Select a aener preset. e default High Resolution preset is ap-
propriate for most printing conditions, but if you have created a
custom preset, choose it from the Preset pop-up menu.
3. To preview the results of using a aener preset, click the Refresh
buon and select objects to highlight:
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