CHAPTER 8 COLOR MANIPULATION, CHANNELS, AND (Disney web site) LAYER
CHAPTER 8 COLOR MANIPULATION, CHANNELS, AND LAYER MODES 323 Figure 8-27. Grabbing a color The Color Channels The GIMP maintains three special color masks that show the red, green, and blue components of the current image. You can see them in the Channels dialog, usually docked as a tab with Layers and Paths (Figure 8-28). Light means a lot of the indicated color; dark means little. Notice the white flower in the blue channel, the general lightness of the green channel (there s a lot of green in the photo), and darkness of the red (there s not much red anywhere). However, the previews in the dialog are too small to see much detail. (You can make them a bit larger using the Preview Size item in the tab configuration menu to the right of the Layers label in the dialog but they ll still be small compared to the full-sized image.) Also, not many operations work directly on the color channels. You can turn a color channel into a selection (via the context menu in the Channels dialog), but for more detailed work with color channels, you re usually better off using Decompose to create an image with red, green, and blue layers.
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