The Background Eraser Tool

The Background Eraser tool offers more options for controlling what is erased and what is not than the Eraser and Magic Eraser tools. The tool works by erasing the sampled color under the brush tip. It also protects any color that matches the foreground color set in the Toolbox.

■ Sampling Continuous, Once, or Background Swatch—In Continuous sampling mode, the tool samples the color under the brush tip constantly as you drag. In Sample Once mode, the sample is taken only once when you click. In Background Swatch sampling mode, whatever color is set as the background color in the Toolbox is erased under the brush tip. To change the background color quickly, press X to switch the foreground and background color boxes, hold down Alt (Windows), Opt (Mac OS), sample, and then press X again to switch the color boxes back to default.

■ Limit: Contiguous, Discontiguous or Find Edges—When the Limits option is set to Contiguous or Discontiguous, the erasure affects only pixels that fall within the Tolerance setting and are either adjacent to each other or disconnected, respectively. The Find Edges option ensures that the integrity of the edge detail is better protected while the sampled color is being erased from continuous areas.

■ Tolerance—Lower settings ensure that only the sampled color is erased, whereas higher settings erase more shades of the sampled color.

■ Protect Foreground Color—When this setting is selected, whatever color is set in the foreground color box in the Toolbox is protected from erasure. You can alter this color at any stage by holding down Alt (Windows), Opt (Mac OS) and clicking in the document.

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