The Magnetic Lasso is one of my most-used tools. As you drag it around any shape with a reasonably well-defined edge, it snaps to the edge. Select it and use it just as you did the Polygonal Lasso. Because it finds edges by looking for differences in contrast, the Magnetic Lasso is most effective on irregular objects that stand out from the background. You can use the Tool Options bar to set the parameters. Width refers to how close to the edge you must be for the Lasso to recognize it (see Figure 3.5). Contrast determines how different the pixels must be in brightness value for the Lasso to recognize them. Frequency determines how often the Lasso sets its anchor points. (Anchor points are the points indicated by boxes on a line. Drag them to adjust the line.)
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