Choose the background eraser by clicking on the eraser
in the toolbar and holding the mouse button down. Drag to
the background eraser’s icon, and release.
The eraser tools act like paintbrushes in reverse. Instead
of laying down color, they pick it up. It’s like watching
a movie running backwards.
The background eraser erases the color on which you first
click, while leaving other colors untouched. This allows
you to more easily work around edges that you don't want
to erase. However, results can be somewhat unpredictable,
so be prepared to experiment.
The background eraser is used to erase to transparency
on the active layer. If you apply this eraser to your background
layer, it will be automatically changed to a regular layer.
You cannot have transparency on a background layer.
Once all options are set in the options palette [see below],
choose a brush
from the pop-up palette and drag in the image to erase to
transparency on the selected layer. The background eraser
cursor has a crosshair in its center showing the hotspot
which is used to choose the colors affected, according to
your settings in the options palette.
A shortcut for changing brush sizes while using any of
the painting tools is to press the left bracket [ to decrease
brush size, and the right bracket ] to move to the next
larger brush.
When editing an image with any tool that uses brushes,
you can right click on the image and the brushes pop-up
palette will appear right next to your cursor.
The keyboard shortcut for the eraser is the letter E. To
cycle through all three eraser tools, hold down the Shift
key while repeatedly pressing the shortcut key.
The illustration on the below, is the background
eraser tool’s options bar. To choose a brush size and type,
click on the little down arrow to the right of the brush
thumbnail. A pop-up palette of available brushes will appear.
For more information on brushes, please see the Brushes page.
In the box titled Tolerance, enter a value for the
degree of variation in color that you want to erase. A low
setting limits erasure to colors very similar to the one
first clicked on. A higher setting allows more shades of
the selected color to be erased. You can type a value into
the box, or access its slider by pressing on the arrow at
the right side of the box and dragging.
The Limits menu, shown activated, determines how
many pixels the eraser affects. Contiguous will allow
erasing in areas containing the designated color which are
also connected to the spot first clicked. Discontiguous
will allow erasing in any part of the image containing the
designated color.
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