326 CHAPTER 8 COLOR MANIPULATION, CHANNELS, AND (Web hosting support)
326 CHAPTER 8 COLOR MANIPULATION, CHANNELS, AND LAYER MODES Use Threshold and QuickMask to Improve the Selection To turn the blue layer into a useful selection mask, use the Threshold tool (Figure 8-31). (A tool such as Levels or Curves will also work.) Figure 8-31. Threshold on the blue channel gives a much cleaner selection. Once you ve set the threshold, you can use drawing tools to clean up the selection. Paint out (in black) anything you don t want, and paint in (in white) anything you do. Once you re happy with your selection mask layer, copy it (Control+C). Now go back to your original image, and activate the QuickMask (remember this from Chapter 5?). A simple paste (Control+V) onto the QuickMask, and your selection is ready (Figure 8-32). Switch from QuickMask mode back into normal mode, and you have a perfect flower that s ready to paste anywhere. Tip This method also works well for creating a layer mask. To avoid the sharp edges that the Threshold tool can create, try Curves or Levels instead.
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