Oce Arizona 550 GT User Manual page 163

How to Create White Spot Data in Illustrator
Note:
While it is possible to set Overprint opacity levels less than 100%, ProductionHouse
software only processes full opacity data. The opacity of regular knockout white data can
be set as desired.
[113] Overprint Attributes
The images below shows white spot data with knockout and overprinting. In this case
the spot data is meant to knockout in order to appear as white in the final document.
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[115] Text Overprinting
[114] Knockout
White Flood Fill Layers
If a white flood layer were required in this file, it would be necessary to place flood data
above the image data layer in order for the Rip to properly process the Spot data. In this
case, you would need to select Overprinting, in order for image data not to be obliterated
by white flood. To properly view the image ensure that Overprint Preview is selected.
See images below for a representation of how this will appear.
Chapter 8 - How to Work With White Ink 163