Convert an alpha channel to a spot channel – Adobe Photoshop CS4 User Manual
Page 505
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USING PHOTOSHOP CS4
Printing
Last updated 1/10/2010
5
Enter a name for the spot channel. If you choose a custom color, the channel automatically takes the name of that
color.
Be sure to name spot colors so they’ll be recognized by other applications reading your file. Otherwise the file might
not print.
6
For Solidity, enter a value between 0% and 100%.
This option lets you simulate on-screen the density 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.
Solidity at 100% and solidity at 50%.
Note: The Solidity and color choice options affect only on-screen previews and composite prints. They have no effect on
printed separations.
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Convert an alpha channel to a spot channel
1
If a selection is active in the image, choose Select > Deselect.
2
Do one of the following:
•
Double-click the alpha channel thumbnail in the Channels panel.
•
Select the alpha channel in the Channels panel, and choose Channel Options from the panel menu.
3
Select Spot Color.
4
Click the color box, then choose a color in the Color Picker or click Color Libraries and choose a custom color.
Click
OK.
5
Rename the channel if needed.
6
Click OK.
The areas of the channel containing grayscale values are converted to spot color.
7
To apply the color to the selected area of the channel, choose Image > Adjustments
> Invert.
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