To use the eraser tool:

1 Select the eraser tool ^ .

2 Do the following in the options bar:

• Choose a brush and set brush options (Photoshop), or choose a preset brush (ImageReady). (See "Working with brushes" on page 228.) This option is not available for Block mode.

• Choose a mode for the eraser—Brush (Photoshop), Paintbrush (ImageReady), Airbrush (ImageReady), Pencil, or Block.

• Specify an opacity to define the strength of the erasure. An opacity of 100% erases pixels completely. A lower opacity erases pixels partially. (This option is not available for Block mode in Photoshop.)

• (Photoshop) In Brush mode, specify a flow rate. (See "Specifying opacity, flow, strength, or exposure" on page 243.)

• (Photoshop) In Brush mode, click the airbrush button ?/■■ to use the brush as an airbrush. Alternately, select the Airbrush option in the Brushes palette. (See "Creating airbrush effects (Photoshop)" on page 239.)

• (Photoshop) To erase to a saved state or snapshot of the image, click the left column of the state or snapshot in the History palette, then select Erase to History in the options bar. (See "Painting with a state or snapshot of an image (Photoshop)" on page 42.)

(Photoshop) To temporarily use the eraser tool in Erase to History mode, hold down Alt (Windows) or Option (Mac OS) as you drag in the image.

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