3 For Channel, choose the spot channel from step 1, and click OK.
4 To create a trap when knocking out the underlying color, choose Select > Modify > Expand or Contract, depending on whether the overlapping spot color is darker or lighter than the spot color beneath it. For more information on trapping, see "Creating color traps" on page 479.
5 In the Channels palette, select the underlying spot channel that contains areas you want to knock out. Press Backspace (Windows) or Delete (Mac OS).
This method can be used to knock out areas from any channels under a spot color, such as the CMYK channels.
6 If a spot color in one channel overlaps more than one other spot color, repeat this process for each channel that contains areas you want removed.
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