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134 CHAPTER 4 DRAWING The Eraser Tool The Eraser (Figure 4-14) erases. Simple, no? Figure 4-14. The Eraser tool Well, not quite that simple. The definition of erase depends on the image. If the current layer has an alpha channel, then erasing makes the current layer transparent wherever the eraser touches it. Remember, alpha channel means that a layer or image supports transparency. The GIMP uses alpha as a synonym for transparency in quite a few places. Tutorials on the web for GIMP or other image-editing programs use this term quite a bit, so it s good to remember it. In a layer that does not support transparency, the Eraser just paints the current background color.
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CHAPTER 4 DRAWING 133 If you have a drawing tablet, you can tell the GIMP about it by clicking on Configure Extended Input Devices in the Input Devices section of the Preferences window. This will pop up the Input dialog, as shown in the following image: By default, the tablet s tools will have Mode: Disabled. Set this to Screen for each tool in turn, then click Save, and GIMP should remember the settings next time. The other Mode option besides Screen is Window, which restricts the tool to work only in the image window. This in theory could give you better control, especially with the smallest-sized tablets. However, in practice, it doesn t work very well on most systems, and it makes it impossible to move the stylus back to the Toolbox window to choose a new tool. Try Window if you want, but most people find that setting all tools to Screen works best. The GIMP also has a Device Status dialog, accessed from the Toolbox via File . Dialogs . Device Status, as shown in the following image. This shows the pointer devices GIMP currently knows about (including tablet devices and the mouse, denoted Core Pointer). It also shows each device s assigned tool, foreground and background color, brush, pattern, and gradient. You can drag and drop items in this dialog to change the values there.
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132 CHAPTER 4 DRAWING Adjustment controls the width of the pen s nib and its angle (0 is horizontal). Sensitivity controls how much the Ink Pen will react as you vary your drawing style with your speed or the pressure and tilt on a tablet. Type controls the shape of the nib. Initially, you choose one of three basic shapes. The Shape box to the right of the type selector lets you refine the nib. It shows the chosen shape with a small square in the middle of it. Drag the square to change the aspect ratio and tilt of the nib (Figure 4-13). Figure 4-13. Dragging the box to change the nib s shape USING A DRAWING TABLET Drawing tablets, or graphics tablets, are devices that include a pad, a stylus, and sometimes a mouse or additional buttons. They re available in a variety of sizes from several manufacturers. Tablets are very popular with professional computer artists for two reasons. First, drawing with a pen- shaped object feels more natural to most people. You have much more control over shapes, and most people find that they can make lines flow more smoothly with a pen on a tablet than with a mouse. The other important reason? Most graphics tablets offer additional controls. They re sensitive to pressure: The GIMP can vary line width, color, or opacity of the line you draw depending on how hard you press on the tablet. Some tablets are also sensitive to tilt: The GIMP can detect whether you re holding the pen straight up or tilted over on its side, and can vary the line accordingly. All of GIMP s drawing tools allow you to specify pressure sensitivity if you have a tablet, and some (like the Ink Pen) are sensitive to tilt as well. Many tablets use a double-ended stylus: the upper end works as a second tool, usually called the eraser. The GIMP can assign different tools to the stylus and the eraser, which makes it very convenient to switch between the two simply by flipping the stylus over. There s a catch to all this, though. It s sometimes difficult to get the operating system to see all the drawing-tablet information the GIMP needs. Tablets under Windows usually work, though there may be some problems with particular models. Tablets under Linux often require you to download additional drivers for the kernel and for X. On the Mac, Apple s implementation of the X Window System does not currently support drawing tablets, though the free Darwin X server does.
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CHAPTER 4 DRAWING 131 The Ink Pen Tool The Ink Pen tool (Figure 4-12) is the most complex of the basic drawing tools, but it can be very rewarding. It emulates an old-fashioned fountain pen with replaceable nibs (tips). Not only can you make nibs of different shapes (analogous to choosing different brushes with the other tools), the Ink Pen reacts to your speed as you draw, creating a line that varies in width like a line from a real ink pen. Careful: you can create blobs of ink if your penmanship isn t quite right. But unlike a real ink pen, you won t get ink all over your shirt pockets! Figure 4-12. The Ink Pen The Ink Pen is most useful if you have a drawing tablet rather than a mouse. It will change line thickness in response to pressure or tilt as reported by a tablet. But even with a regular mouse, you can sometimes create nice effects. The Ink Pen, unlike all the other drawing tools, ignores GIMP s current brush. It has its own notion of a brush, similar to GIMP s parametric brushes, with the following options:
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