Oce Arizona 180 GL, User Manual

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How to Create White Spot Data in Photoshop
Introduction
This section explains how to prepare images that include white spot data with raster-based
image editing applications such as Adobe Photoshop®. In order to print with white ink,
you must have a media properly configured for the use of white spot data (see the section,
How to Create a Media for White Ink). This media model will include at least one layer
configured as a white spot color.
To add spot color data to your image in PhotoShop, you need to create one layer within
the image as a new spot channel. It is possible to have more than one spot element in an
image, but each element must be on the same spot channel, and therefore have the same
opacity level, or else ProductionHouse will treat the saved document as a separation file.
CMYK is the preferred image mode as the actions required for spot data creation are
simpler than those for RGB.
Note:
You can use raster-based image editing applications other than Photoshop as long as it
has the ability to create spot channels.
Purpose
When you have a raster-based image and need to have select areas of that image show up
as white when the media is non-white or clear or translucent, you can prepare a spot
channel for the white data in Photoshop.
When to do
The first step in the white ink workflow is to prepare your source image to use the white
ink channel. The white ink data must be designed entirely on a separate channel (either
as a spot channel layer or a custom spot color) to be recognized by the Onyx RIP. The
name you assign to this spot channel layer or custom spot color must be "Spot 1" and is
the most important part of preparing the file. This named channel allows RIP-Queue to
determine that the data in the source image needs to be output to the spot white channel.
In preparing your file, only you can define what you want to print with "white ink" as
part of your design and assign the color as described in this document. Using your
graphic application program, the white ink data can be simple or complex and can range
from vector shapes and text to halftone bitmap images.
Chapter 9 - How to Work With White Ink 156
How to Create White Spot Data in Photoshop