Adobe InDesign CC 2015 - Manual (Page 513)

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Transparency
Last updated 6/6/2015
In Illustrator and Acrobat, to magnify the preview, click in the preview area. To zoom out, Alt-click/Option-click in
the preview area. To pan the preview, hold down the spacebar and drag in the preview area.
Refresh the preview in the Flattener Preview panel
• To automatically update the display whenever it is out of date and idle, select Auto Refresh Highlight.
• To manually update the display, click Refresh.
In both cases, the display is updated in the document window according to the transparency flattening settings you
chose.
Best practices when creating transparency
In most cases, flattening produces excellent results when you use an appropriate predefined flattener preset, or create a
preset with settings appropriate for your final output. For a complete reference and troubleshooting guide on how
transparency affects output, see the document “Achieving Reliable Print Output with Transparency” (English only) on
the Adobe website.
However, if your document contains complex, overlapping areas and you require high-resolution output, you can
achieve more reliable print output by following a few basic guidelines:
Note: If you’re applying transparency to documents intended for high-resolution output, be sure to discuss your plans with
your service provider. Good communication between you and your service provider will help you achieve the results you
expect.
Overprinting objects
Although flattened objects may look transparent, they are actually opaque and don’t allow other objects beneath them
to show through. However, if you don’t apply overprint simulation, the transparency flattener may be able to preserve
basic overprinting of objects when exporting to PDF or printing. In this case, recipients of the resulting PDF file should
select Overprint Preview in Acrobat 5.0 or later to accurately view the results of overprinting.
Conversely, if you apply overprint simulation, the transparency flattener provides a simulation of what the overprints
look like, and this simulation results in all opaque objects. In PDF output, this simulation converts spot colors to
process color equivalents. Therefore, Simulate Overprint should not be selected for output that will be color separated
later.
Spot colors and blending modes
Using spot colors with certain blending modes sometimes produces unexpected results. This is because InDesign uses
process color equivalents on screen, but uses spot colors in print. In addition, isolated blending in an imported graphic
could create knockouts in the active document.
If you use blending, check your design periodically using Overprint Preview in the View menu. Overprint Preview gives
an approximation of how spot inks that overprint or interact with transparent objects will appear. If the visual effect is
not what you want, do any of the following:
• Use a different blending mode or no blending mode. Avoid these blending modes when working with spot colors:
Difference, Exclusion, Hue, Saturation, Color, and Luminosity.
• Use a process color where possible.
Blend space