Creating spot channelsYou can create a new spot channel or convert an existing alpha channel to a spot channel. To create a new spot channel:
If you made a selection, that area is filled with the currently specified spot color. 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). 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. Be sure to name spot colors so they'll be recognized by other applications reading your file. Otherwise the file might not print. To convert an alpha channel to a spot channel:
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