The Eraser Tool

The Eraser tool has three modes: Block, Pencil, and Brush. In Block mode, the only control you have is to erase to history or to alter the size of the block by changing the magnification of the document.

■ To erase, select the tool and then drag in the document. If the layer is a normal layer, pixels are erased to transparency; if you drag on a Background layer or a layer with locked transparency, pixels are painted with the background color.

■ To erase to history, select Erase to History on the options bar and then choose a history state as the source in the History palette. You can also switch between normal Block mode and Erase to History by holding down Alt (Windows), Opt (Mac OS).

■ To increase the block size, zoom out; to decrease it, zoom in.

■ To change from Block to either Pencil or Brush mode, right-click (Windows), Ctrl-click (Mac OS) and select a mode from the contextual menu.

In Pencil mode, you can use any one of the available brush presets, control the opacity of the strokes, and Erase to History. However, the brush tips cannot be softened, nor can the strokes be anti-aliased to provide smooth edges. In Brush mode, you have access to all the following options: Opacity, Flow (the latter controls how quickly or slowly the paint is applied), Airbrush, and Erase to History.

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