Adobe PHOTOSHOP 6.0 Manual page 202

CHAPTER 7
192
Using Channels and Masks
4 Click the color box, and choose a color.
For more information, see "Using the
Adobe Color Picker" in online Help.
If you select a custom color, your print service
provider can more easily provide the proper ink to
reproduce the image.
For more information, see "Choosing
custom colors (Photoshop)" in online Help.
For Solidity, enter a value between 0%
5
and 100%.
This option lets you simulate on-screen the
solidity of the printed spot color. A value of 100%
simulates an ink that completely covers the inks
beneath (such as a metallic ink); 0% simulates a
transparent ink that completely reveals the inks
beneath (such as a clear varnish). You can also use
this option to see where an otherwise transparent
spot color (such as a varnish) will appear.
Note: The Solidity and color choice options affect
only the on-screen preview. They have no effect on
the printed output.
To enter a name for the spot channel, choose a
6
custom color in step 4, and the channel automati-
cally takes the name of that color.
Be sure to name spot colors so they'll be recog-
nized by other applications reading your file.
Otherwise the file might not print.
Click OK.
7
To convert an alpha channel to a spot channel:
Double-click the alpha channel in the
1
Channels palette.
If needed, rename the channel.
2
Select Spot Color.
3
4 Click the color box, and choose a color in the
Color Picker dialog box.
For more information, see "Using the
Adobe Color Picker" in online Help.
Click OK. The areas of the channel containing
5
grayscale values are converted to spot color.
Choose Image > Adjust > Invert to apply the
6
color to the selected area of the channel.
Modifying spot channels
You can edit a spot channel to add or remove color
in it, change a spot channel's color or on-screen
color solidity, and merge a spot channel with the
image's color channels.
For information on rearranging, duplicating, or
deleting spot channels, see "Managing channels
(Photoshop)" on page 187.