128 CHAPTER 4 DRAWING Dissolve adds (Make my own web site)
128 CHAPTER 4 DRAWING Dissolve adds randomness to the drawing. Wherever GIMP would have drawn partial transparency, instead it will draw a random pattern of dots. (Dissolve is also available as a layer mode, but it s more often useful for drawing.) Behind draws behind anything that s already drawn in the layer. This only works when drawing onto a layer that has transparency. (On an opaque layer, such as a background layer filled with white, it would make no sense. You wouldn t be able to see something drawn behind an opaque background!) Color erase seeks out the current foreground color and erases it, replacing it with transparency. It doesn t erase any other colors; only the current foreground color. Of course, like Behind, this only works if the layer allows transparency. In Figure 4-8, the foreground color was changed to red before drawing the color-erase sample; it would have had no visible effect when the foreground color is black, since it doesn t match the red box. Drawing Fuzzy or Smooth Lines: The Paintbrush Tool The Pencil tool is okay when you re using hard-edged brushes. But what if you want to use one of those fuzzy brushes? Or what if you want a line without those jaggy edges that the Pencil tool makes? In that case, use the Paintbrush tool (Figure 4-9). Figure 4-9. The Paintbrush tool
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