Adobe 13101332 - Photoshop - Mac User Manual page 274

Adobe Photoshop Help
Using Help | Contents
To change a spot channel's options:
1 Do one of the following:
Double-click the spot channel thumbnail in the Channels palette.
•
Select the spot channel in the Channels palette, and choose Channel Options from the
•
palette menu.
2 Click the color box, and choose a color. (See
page 261.)
By selecting a custom color, your print service can more easily provide the proper ink to
reproduce the image. For more information, see
page 263.
3 For Solidity, enter a value between 0% 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 and the
composite print. They have no effect on the printed separations.
To merge spot channels:
1 Select the spot channel in the Channels palette.
2 Choose Merge Spot Channel from the palette menu.
The spot color is converted to and merged with the color channels. The spot channel is
deleted from the palette.
Merging spot channels flattens layered images. The merged composite reflects the
preview spot color information, including the Solidity settings. For example, a spot
channel with a solidity of 50% will produce different merged results than the same
channel with a solidity of 100%.
In addition, the resulting merged spot channels usually don't reproduce the same colors
as the original spot channels, because CMYK inks can't represent the range of colors
available from spot color inks.
Adjusting overlapping spot colors
To prevent overlapping spot colors from either printing over or knocking out the under-
lying spot color, remove one of the spot colors where they overlap.
Use a printed sample of the overprinted inks to adjust your screen display to help you
predict how colors will look when printed.
Note: In some cases, such as varnish and bump plates, you may want colors to overprint.
To adjust overlapping spot colors:
1 In the Channels palette, select the spot channel with the color you want to print.
2 Choose Select > Load Selection.
To quickly select an image in a channel, hold down Ctrl (Windows) or Command
(Mac OS), and click the channel in the Channels palette.
Using Help | Contents
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Using Channels and Masks
"Using the Adobe Color Picker" on
"Choosing custom colors (Photoshop)" on
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