Adobe InDesign - Manual (Page 656)

(Illustrator only) Select Preserve Alpha Transparency (Flatten Transparency dialog box only)
(Illustrator only) Select Preserve Spot Colors And Overprints (Flatten Transparency dialog box only)
Preserve Overprint (Acrobat only)
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Note:
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Preserves the overall opacity of flattened
objects. With this option, blending modes and overprints are lost, but their appearance is retained within the processed artwork, along with the
level of alpha transparency (as when you rasterize artwork using a transparent background). Preserve Alpha Transparency can be useful if you are
exporting to SWF or SVG, since both of these formats support alpha transparency.
Generally preserves spot colors. It
also preserves overprinting for objects that aren’t involved in transparency. Select this option when printing separations if the document contains
spot colors and overprinted objects. Deselect this option when saving files for use in page-layout applications. With this option selected,
overprinted areas that interact with transparency are flattened, while overprinting in other areas is preserved. The results are unpredictable when
the file is output from a page-layout application.
Blends the color of transparent artwork with the background color to create an overprint effect.
Preview which areas of artwork will be flattened
Use the preview options in the Flattener Preview to highlight areas that are affected by flattening. You can use this color-coded information to
adjust flattening options.
The Flattener Preview is not intended for precise previewing of spot colors, overprints, and blending modes. Instead, use Overprint Preview
mode for those purposes.
1. Display the Flattener Preview panel (or dialog box):
In Illustrator, choose Window > Flattener Preview.
In Acrobat, choose Tools > Print Production > Flattener Preview.
In InDesign, choose Window > Output > Flattener Preview.
2. From the Highlight menu, choose the kind of areas you want to highlight. The availability of options depends on the content of the artwork.
3. Select the flattening settings you want to use: Either choose a preset or, if available, set specific options.
(Illustrator) If the flattening settings aren’t visible, select Show Options from the panel menu to display them.
4. If the artwork contains overprinted objects that interact with transparent objects, in Illustrator, select an option from the Overprints menu. You
can preserve, simulate, or discard overprints. In Acrobat, choose Preserve Overprint to blend the color of transparent artwork with the
background color to create an overprint effect.
5. At any time, click Refresh to display a fresh preview version based on your settings. Depending on the complexity of the artwork, you may
need to wait a few seconds for the preview image to appear. In InDesign, you can also choose Auto Refresh Highlight.
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
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