Adobe Illustrator CC 2015 - Manual (Page 508)

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Printing
Last updated 6/5/2015
Use Japanese-style crop marks
Japanese-style crop marks have double lines, which visually define a default bleed value of 8.5 points (3 millimeters).
1 Choose Edit > Preferences > General (Windows) or Illustrator > Preferences > General (Mac OS).
2 Select Use Japanese Crop Marks, and then click OK.
White Overprint | Illustrator CC
Artwork created in Illustrator can have white objects applied with unintentional overprint. This becomes apparent only
when one turns on the overprint preview or printing separations. This causes delays in the production process and
reprinting may need to be performed. Though Illustrator warns users if a white object is applied with overprint, there
are scenarios when a white overprint may occur without it coming to the user’s notice. For example:
From this version of Illustrator, you have the Discard White Overprint option to remove white overprint attributes in
the Document Setup and Print dialogs. This option is, by default, switched on in both dialogs . If the Discard White
Overprint option is not selected in the Document Setup dialog, it can be overridden by selecting the option in the Print
dialog.
Scenario 1 An object with overprint is selected, and then a new object with white fill/stroke is created. In this scenario
the appearance attributes of previously selected objects is copied to the new object, resulting in overprint applied to the
white-filled object.
Scenario 2 A non-white object with overprint is changed to an object with white fill. To overcome this problem, we
now remove the overprint attribute from white objects during operations like printing or saving to EPS or PDF. This
enables users to use print and output without the need to check and correct for white-object overprint in artwork. This
approach will be optimal for most scenarios - legacy artwork, new artwork, non-White objects with Overprint applied
to them when changed to White.
Spot White objects with overprint are not affected by this operation. This affects only the saved files or the output of an
Illustrator file. Also, artwork remains unaffected by this setting.