Eraser Tool
If you use the Eraser tool while you're working on a background image (we'll talk about the background in Chapter 3, “Layers Primer”), it acts like one of the normal painting tools—except that it paints with the background color instead of the foreground color. It even lets you choose which type of painting tool it should mimic by allowing you to select an option from the pop-up menu in the options bar (Figure 1.51).
Figure 1.51. Choosing Eraser tool behavior.
However, when you use the Eraser tool on a nonbackground layer, it really erases the area. If you lower the Opacity setting, it makes an area appear partially transparent. ...
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