Adobe Photoshop CS6, User Manual

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Change pixels to transparent with the Background Eraser tool
The Background Eraser tool erases pixels on a layer to transparency as you drag. You can 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.
If you want to erase the background of an object with intricate or wispy edges, use QuickSelect.
The background eraser samples the color in the center of the brush, also called the hotspot, 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.
The background eraser overrides the lock transparency setting of a layer.
1. In the Layers panel, select the layer containing the areas you want to erase.
2. Select the Background Eraser tool . (If the tool isn’t visible, hold down the Eraser tool , and choose the Background Eraser from the
pop-up menu.)
3. Click the brush sample in the options bar, and set brush options in the pop
-
up panel:
Choose settings for the Diameter, Hardness, Spacing, Angle, and Roundness options (see Brush tip shape options).
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 if you don’t want to 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; and 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 you
first click; and 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 .
Auto Erase with the Pencil tool
The Auto Erase option for the Pencil tool lets you paint the background color over areas containing the foreground color.
1. Specify foreground and background colors.
2. Select the Pencil tool .
3. Select Auto Erase in the options bar.
4. Drag over the image.
If the center of the cursor is over the foreground color when you begin dragging, the area is erased to the background color. If the center of
the cursor is over an area that doesn’t contain the foreground color when you begin dragging, the area is painted with the foreground color.
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