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Create Spot Data in Photoshop
Introduction
This section explains how to prepare images that include spot data with raster-based image
editing applications such as Adobe Photoshop. In order to print with white ink, you must have an
ONYX profile (media model) properly configured for the use of spot data. To add spot color data
to your image in Photoshop, you need to create a 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 ONYX Thrive will treat the
saved document as a separation file. Since the Arizona printers with white ink support two spot
channels, you can create one spot channel for Spot 1 data and another for Spot 2 data. 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 a spot ink channel.
The spot data must be designed entirely on a separate spot channel to be recognized by the
ONYX RIP. The name you assign to this spot channel layer must be Spot 1 or Spot 2 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 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 spot data can
be simple or complex and can range from vector shapes and text to halftone bitmap images.
Use the following steps to create a new spot channel layer:
Procedure
1.
Open the desired file in Photoshop (if the file is in RGB mode, then convert it to CMYK mode).
NOTE
The image file used in this example is for illustration purposes only. For best results
when working with text, we recommend that you use a vector-based program such as
Adobe Illustrator.
2.
Ensure that the Channels tab is visible (under the Window menu click Channels to view the
panel).
3. Select the area of the image you wish to print with white ink.
Create Spot Data in Photoshop
128 Chapter 7 - How to Manage a White Ink Workflow