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Adobe Creative Suite 5 Printing Guide 37
•You can’t preview the overprinting eects of built-in trapping or
Adobe In-RIP Trapping. Separations Preview displays only the eects
of overprints applied manually through the Aributes panel.
You can use the Ink Limit feature in the Separations Preview panel to
see if any areas of the document exceed a specified limitfor example,
320% for sheetfed printing. The total ink limit depends on the press
being used to run the job, the type of stock, and other factors. If only a
few small areas are highlighted in this preview, it should be no cause for
alarm. But if large areas exceed the desired total ink limit, you may have
to edit graphics and other content to ensure that their total ink value
falls within the limit to prevent printing problems.
In the Separations Preview panel, choose Ink Limit from the View
pop-up menu, and enter an ink limit value. Areas in gray are within the
total ink limit. Areas shown in red are over your ink limit; more intense
reds indicate greater degrees of ink-limit excess. The percentages along
the right side of the panel indicate the ink amounts at the location of
the pointer.
To view the ink percentage at any point on the layout:
1. Position the mouse where you want to evaluate the ink percent-
ages.
2. Refer to the percentages along the right side of the Separations
Preview panel. Ink values for each plate are displayed, along with
the total for CMYK plates.
Note: When viewing separations, the total CMYK ink value is displayed, but not the
total combined ink value for overlapping process and spot colors. Position the cursor
over areas of overlapping process and spot colors, and add the CMYK total value to the
values displayed for spot colors. To highlight areas exceeding a total ink coverage limit,
choose Ink Limit from the Separations Preview panel pull-down menu. Set the Ink Limit
value for your press condition; areas exceeding the limit are highlighted in red.
Overprint Preview
Overprint Preview is a View mode (View > Overprint Preview) that
simulates how objects set to overprint will appear in color-separated
output (or composite output when the Simulate Overprint option is
enabled). When Overprint Preview is on, you can see underlying objects
through overprinted objects as they would appear on press. Because
Overprint Preview models ink behavior, overprinted objects that use
lighter or screened inks reveal more underlying inks during overprint
preview because they actually are less opaque when printed.
Overprint Preview also gives a more realistic view of spot colors
involved with certain blending modes. In the normal, composite view,
interactions between spot color objects may be misleading, so make it
a habit to check files by turning on Overprint Preview. Because turning
on Overprint Preview also turns on High Quality Display, you may
experience a slight slowing of performance in InDesign as a result.
Consequently, you may wish to turn on Overprint Preview to check
content, and then turn it off once you have finished.
Using Overprint Preview
e text and oval both have a ll of solid PMS 399, and the text is set to Multiply. e
composite view (le) is misleading: aer all, you can’t have 200% of a single ink. Turn on
Overprint Preview, however (right) and you’ll see how this eect will actually print.
Flattener Preview
To display the Flattener Preview panel choose Window > Output >
Flattener Preview. To evaluate the effects of flattening, select an option
from the Highlight pop-up menu in the Flattener Preview panel:
•Rasterized Complex Regions: Highlights areas that are rasterized
based on the seings in the transparency aener preset. When the
Raster/Vector Balance slider is set to 100, no areas are highlighted
because rasterization only occurs within the outlines of each text or
line-art object that’s aected.
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