328 CHAPTER 8 COLOR MANIPULATION, CHANNELS, (Web hosting faq) AND
328 CHAPTER 8 COLOR MANIPULATION, CHANNELS, AND LAYER MODES Decompose to HSV, and then run Threshold on the value layer (Figure 8-34). Clean up any stray pixels with a drawing tool such as the Pencil, and you re ready to select the sky. Once the sky is selected (you may also want to grow or feather the selection by a few pixels), you can make a replacement light blue sky (Figure 8-35). But it doesn t look right. What s wrong with the sky in Figure 8-35? Real skies are darker and bluer up high, fading to lighter colors down low. So use a gradient and two similar shades of blue to make a more realistic sky (Figure 8-36). Selecting based on the Saturation channel is also useful. For instance, in a photo showing a blue sky with clouds, the blue sky is more saturated than the clouds, so you can select just the blue sky, and then make it darker blue . . . or green, or red. Figure 8-34. Run Threshold on the value layer.
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