Sharpen the Black Channel
If your image is destined for CMYK mode, then be sure to make an extra sharpening pass on the black channel. Just open the Channels palette (Window > Channels), click on the Black channel, and sharpen away. Because black ink is mainly used in the darker areas of the image, you can get away with some rather aggressive settings. (Try these: Amount = 350, Radius = 1, Threshold = 2.) Perform this sharpening pass after you've already sharpened the full color image (Figures 12.61 to 12.63).
Figure 12.61. Original unsharpened image. (©Stockbyte, www.stockbyte.com)
Figure 12.62. Result of sharpening the image while in RGB ...
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