Adobe Photoshop CC 2014 v.14.xx - Manual (Page 664)

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Note:
Example of erasing similar pixels
1. Select the Magic Eraser tool .
2. Do the following in the options bar:
Enter a tolerance value to define the range of colors that can be erased. A low tolerance erases pixels within a range of color values
very similar to the pixel you click. A high tolerance extends the range of colors that will be erased.
Select Anti-aliased to smooth the edges of the area you erase.
Select Contiguous to erase only pixels contiguous to the one you click, or deselect to erase all similar pixels in the image.
Select Sample All Layers to sample the erased color using combined data from all visible layers.
Specify an opacity to define the strength of the erasure. An opacity of 100% erases pixels completely. A lower opacity erases pixels
partially.
3. Click in the part of the layer you want to erase.
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:
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