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ActiveX Control: A simple, authenticated program that runs in your browser. Shutterfly's plug-in for Internet Explorer is an ActiveX Control.

Address Book: Shutterfly allows you to keep an address book of all the names and addresses of the people you send digital prints to or share your photos with online.

Ambient Light: The amount of natural light present in your digital photo.

Anti-Aliasing: Smoothing out stair-stepping (jagged lines or "jaggies") in digital prints or photos by softening the transition of color between background pixels and edge pixels. The more advanced image editors offer this feature.

Archive: To back up files or digital photos for storage. Digital photos are often archived on CDs or tape.

Artifact: The added, and undesirable, changes made to a photo. Typically, these changes are caused by the digital camera or the way the digital camera encodes the picture (see JPEG).

ASA: American Standards Association. Film ratings, expressed as a number indicating a film's sensitivity to light. ASA is equivalent to ISO.

Aspect Ratio: The relative horizontal and vertical sizes of an image. If a digital print has an aspect ratio of 2:1, it means that the width is twice as large as the height.

AWB(Automatic White Balance): A setting in digital cameras that attempts to determine and adjust for the light conditions in which the camera is operating. (See: White Balance)

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