Digital Photography Glossary: A

adapter: Device used to attach certain lenses or filters to your digital camera.

Adobe Photoshop: The leading professional image-editing program for your computer.

Adobe Photoshop Album: A program that enables you to view one or several of your images at the same time, all in one easily navigated workspace.

Adobe Photoshop Elements: A less expensive version of Photoshop with fewer of the ultra-high-end features the professional version includes.

anti-aliasing: A process that smoothes the rough edges or jaggies in images by creating partially transparent pixels along the boundaries that are merged into a smoother line by our eyes.

aperture: An opening made by an adjustable diaphragm, which permits light to enter the camera lens and reach the image sensor.

aperture-priority autoexposure: A semi-automatic exposure mode; the photographer sets the aperture, and the camera selects the appropriate shutter speed to produce a good exposure.

Auto mode: A digital camera mode in which both the aperture and shutter speed are set automatically.

auto shut-off: A digital camera feature that turns off the camera after a certain time period of inactivity.

autoexposure: A feature that puts the camera in control of choosing the proper exposure settings.

autofocus: A camera setting that allows the camera to choose the correct focus distance for you, usually based on the contrast of an image or set by a mechanism, such as an infrared sensor, that measures the actual distance to the subject.

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