Adobe PHOTOSHOP 5.0, User Manual, Page: 253 / 400

245 ADOBE PHOTOSHOP 5.0
User Guide
6
Click OK.
7 For each channel, make sure that the image
you want is open. If you change your mind
about image type, click Mode to return to the
Merge Channels dialog box.
8
If merging into a multichannel image, click
Next, and repeat step 7 to select the remaining
channels.
Note: All channels of a multichannel image are
alpha channels.
9 When finished selecting channels, click OK.
The selected channels are merged into a new
image of the specified type, and the original
images closed without any changes. The new
image appears in an untitled window.
Note: You cannot split and recombine (merge)
an image with spot color channels. The spot color
channel will be added as an alpha channel.
Adding spot colors
Spot colors are special premixed inks used instead
of, or in addition to, the process color (CMYK)
inks. Each spot color requires its own plate on the
press. (Because a varnish also requires a separate
plate on press, it is considered a spot color, too.)
For information on printing spot color plates, see
“Printing color separations” on page 343.
Use the following methods to assign spot colors
to an image:
•
To apply spot color as a tint throughout the
image, convert the image to Duotone mode and
apply the spot color to one of the duotone plates.
You can use up to four spot colors, one per plate.
(See “Using monotones, duotones, tritones, and
quadtones” on page 339.)
•
To apply spot color to specific areas of the image,
create spot channels. The following sections
discuss spot channels.
Using spot channels
Spot channels let you add and preview spot colors
in an image.
The following guidelines can help you in using
spot channels:
•
If you need spot color graphics that have crisp
edges and knock out the underlying image,
consider creating the additional artwork in a page-
layout or illustration application.
•
You can create new spot channels or convert an
existing alpha channel to a spot channel.
•
Like alpha channels, spot channels can be edited
or deleted at any time. (For more information, see
“Using alpha channels” on page 252.)
•
Spot colors can’t be applied to individual layers.