Adult web hosting - CHAPTER 9 ADVANCED DRAWING 347 Darken or
CHAPTER 9 ADVANCED DRAWING 347 Darken or Lighten Only These two are easy: they do just what their names imply. For each color component of each pixel, GIMP will show you the darker (or lighter) of the two components. So Darken only will make the image darker, while Lighten only will make it lighter. So Lighten only would be: if (B > F) (Lighten only) B else F To get Darken only, just reverse the greater-than sign to a less-than sign. Grain Extract and Grain Merge Grain extract is supposed to produce something akin to the grain you might see in photographic film. In reality, I find it s more useful for giving images an embossed and desaturated look. Its equation is surprisingly simple: B F + 128 (Grain extract) Grain merge adds texture to an ordinary image, as if adding film grain or texture from an artist s canvas. The equation is the mirror of Grain extract: B + F 128 (Grain merge) Hue, Color, Saturation, and Value These modes are straightforward once you understand what they do, but their names can be a bit confusing. Hue mode takes the hue from the front layer (unless the front layer s saturation is 0), but takes saturation and value from the back layer. Saturation and Value modes, likewise, take the named value from the front layer and everything else from the back layer. Note Some graphics programs offer a Luminosity mode instead of Value. It s the same thing. Color mode gives you the color of the front layer with the lightness of the back layer. It s like Hue, except that it uses both hue and saturation from the front layer, combined with the value from the back layer. You can use this mode to colorize an image, using a photograph as the back layer and a solid color as the front layer. It s as if you took a black-and-white version of the back layer and covered it with a colored filter only it works better than simply using a translucent-colored layer in normal mode, since that would darken the image unacceptably. Saturation and Value modes aren t needed very often (Saturation can be used to remove color from selected parts of an image), but Hue and Color modes can be quite useful for colorizing images, as you ll see in Chapter 10.
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