CHAPTER 5 SELECTION 191 One way to (Web site translator)
CHAPTER 5 SELECTION 191 One way to obtain this effect is to invert the selection (Select . Invert) so you ll now have the foreground selected. Copy, then paste the foreground and make it a new layer. After that, you can paste the transparent Saturn (or anything else you want) between the two layers. Subtract mode is the inverse of Add mode: it subtracts from the selection. This is particularly handy when confronted with the opposite of your previous problem: an automated tool has selected just a little bit too much. USING MODIFIER KEYS FOR SELECTION MODES Pressing the Shift key before dragging out a selection will enable Add mode. However, the Shift key also has another meaning in some selection tools: in Rectangle and Ellipse Select, it constrains the selection to be a square or circle. (If you find this confusing, use the Mode buttons in tool options when you want to add to or subtract from the selection.) Then how do you constrain a selection to a square or circle if you don t want Add mode? The trick is to start dragging, and then press Shift. This will turn on the constraint without changing the mode. Likewise, pressing the Control key will enable Subtract mode, but in some tools it has another effect. In Rectangle and Ellipse Select, Control makes the selection expand outward from the starting point, instead of using that point as the upper-left corner. The trick is to hold down the Shift key while you start the drag, and then release it while still dragging. Intersect mode adds to the selection except where the old and new selections overlap: there, it will deselect what was selected previously. The QuickMask Sometimes, outlining just isn t the best way to select an object. You may catch yourself won dering, Isn t there a more direct way to say that I want to select here and here but not there? GIMP has an answer: the QuickMask. The QuickMask lets you see the selection visually superimposed on the image instead of the usual marching ants view. Everything selected will look normal; everything not selected will have a translucent red mask over it. You can paint on the mask with all the usual tools, like the Pencil and Paintbrush. Everywhere you paint in white will be selected; paint black to deselect. Painting in gray, or with the edge of a fuzzy brush, will partially select. The QuickMask is one of those mind-bogglingly useful features that lots of people don t know about. It s easy to miss. I used GIMP for years before I stumbled onto it. Don t make that mistake, because the QuickMask can make complex selections easy. Just remember that red means not selected. Flip to QuickMask mode by pressing the small square button at the bottom-left corner of the image window (Figure 5-22). You can flip back and forth between QuickMask mode and normal (marching ants) mode at any time with that button.
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