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Alpha channel: A spot color channel in the Channels palette that you create using the Color Range tool.
Anchor point: As lines and curves are drawn using the Pen tool, anchor points are created that define the line, its endpoints, and its curves. Anchor points can be added or deleted from a shape, and they can be edited.
Angle: Controls the angle of the brush stroke. Angling creates a calligraphic look.
Art History Brush: Allows you to change an image to make it look like some other type of artwork—artwork that is older, such as impressionist artwork, an oil painting, or a watercolor. These changes are unlike filters and similar tools because they allow you to brush over only part of the image to make the changes and do not apply the change to the entire image or layer.
