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Grokking The Gimp
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3.5.3 Using Zoom

One of the most useful tools that can be used in conjunction with the Bezier Path selection tool is the Zoom tool, found in the Toolbox and in the Image:View menu. This tool was covered in some detail in Section  1.8.1; however, its value for aiding selections is emphasized here.

When attempting to perform a precise selection of a subject, it is essential to get in close to the pixels. Figure  3.26(a)

  
Figure 3.26: Using Zoom to Aid with Selections
Figure 3.26

shows a Bezier path of an airplane that is to be converted to a selection. However, prior to the conversion it is desirable to examine the path to verify its accuracy.

Figure  3.26(b) is a 400% zoom of Figure  3.26(a). As can be seen the control point of the Bezier path located at the junction of the right wing and the fuselage is not quite correctly positioned. It is only through the use of Zoom that such a careful examination of the selection can be made. It is quite easy to improve the positioning of the control point using the Edit Point mode button in the Paths dialog.

Although the Zoom tool was used in Figure  3.26(b) to verify a Bezier path, it is often a good strategy to draw the path from the start in a zoomed window. A useful tool for helping with this is the Navigation Window,  found in the Image:View menu. Figure  3.26(c) illustrates this tool, which consists of a thumbnail of the image with a panning rectangle superimposed on it. This panning rectangle shows the part of the image that can be viewed in the zoomed image window. The panning rectangle can be dragged with the left mouse button, and this makes the image in the zoomed window move in tandem with it. In addition to the panning function of the Navigation Window it also contains + and - buttons, which can control the amount of zoom applied to the image window.

Grokking The Gimp
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