Adobe 23101335 User Guide - Page 202

192 CHAPTER 7 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. 5 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. They have no effect on the printed output. 6 To enter a name for the spot channel, choose a custom color in step 4, and 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. 7 Click OK. To convert an alpha channel to a spot channel: 1 Double-click the alpha channel in the Channels palette. 2 If needed, rename the channel. 3 Select Spot Color. 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. 5 Click OK. The areas of the channel containing grayscale values are converted to spot color. 6 Choose Image > Adjust > Invert to apply the 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.