Using the background eraser tool (Photoshop)

The background eraser tool lets you erase pixels on a layer to transparency as you drag; this allows you to erase the background while maintaining the edges of an object in the foreground. By specifying different sampling and tolerance options, you can control the range of the transparency and the sharpness of the boundaries. The background eraser samples the color in the center of the brush, also called the hot spot, and deletes that color wherever it appears inside the brush. It also performs color extraction at the edges of any foreground objects, so that color halos are not visible if the foreground object is later pasted into another image.

Note: The background eraser overrides the lock transparency setting of a layer.

To use the background eraser tool:

1. In the Layers palette, select the layer containing the areas you want to erase.
2. Select the background eraser tool .
3. Click the brush sample in the options bar and set brush options in the pop-up palette:
• For more information on the Diameter, Hardness, Spacing, Angle, and Roundness options, see Customizing brush tips (Photoshop).
• If you're using a pressure-sensitive digitizing tablet, choose options from the Size and Tolerance menus to vary the size and tolerance of the background eraser over the course of a stroke. Choose Pen Pressure to base the variation on the pen pressure. Choose Stylus Wheel to base the variation on the position of the pen thumbwheel. Choose Off to not vary the size or tolerance.
4. Do the following in the options bar:
• Choose a Limits mode for erasing: Discontiguous to erase the sampled color wherever it occurs under the brush; Contiguous to erase areas that contain the sampled color and are connected to one another; Find Edges to erase connected areas containing the sampled color while better preserving the sharpness of shape edges.
• For Tolerance, enter a value or drag the slider. A low tolerance limits erasure to areas that are very similar to the sampled color. A high tolerance erases a broader range of colors.
• Select Protect Foreground Color to prevent the erasure of areas that match the foreground color in the toolbox.
• Choose a Sampling option: Continuous to sample colors continuously as you drag; Once to erase only areas containing the color that you first click; Background Swatch to erase only areas containing the current background color.
5. Drag through the area you want to erase. The background eraser tool pointer appears as a brush shape with a cross hair indicating the tool's hot spot .