Preview transparency flattening
1.Choose Advanced > Transparency Flattener Preview.
2.Click Refresh.
3.Select preview settings.
4.To magnify the preview, click in the preview area. To pan the preview, press the spacebar and drag.
5.Drag the Rasters/Vectors slider or enter a value to specify the degree of rasterization in complex areas of the artwork.
6.Specify a rasterization resolution for rasterizing complex areas.
7.Select additional flattening settings.
8.Click Refresh to show the new settings.

Print Production
Previewing transparency flattening in complete Help
Controlling transparency flattening in complete Help