CHAPTER 4 DRAWING 141 Figure 4-20. Fill (Affordable web design)
CHAPTER 4 DRAWING 141 Figure 4-20. Fill similar colors For example, in a photo like Figure 4-20, you might want to use Fill similar colors to replace a cloudy sky with a blue one. Set the foreground color to light blue, then click somewhere in the sky. With a very low Threshold, not much of the sky is likely to have the same color as the point where you click; you end up with color bands and an unnatural look. With the default Threshold of 15, a lot of the clouds get replaced, but not all of them; sometimes this looks okay, but other times it looks weird. With just the right Threshold (50, for this image), the whole sky is replaced, but nothing else. Go higher, and some of the fill will spill over into other areas, like the cliff face. At very high settings, nearly every color in the image will be replaced, and at the highest setting of 255, the entire image will be blue. The only way to determine the exact Threshold setting is by experimenting; it s different for every image.
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