Glossary AE Automatic Exposure metering, i.e. the camera measures the light and sets shutter speed and aperture (either or both). AE lock (AE-L) Locks an automatic exposure setting in the camera's memory. AF Auto-focus. AF lock (AF-L) Locks an auto-focus lens at its present focus distance. Aliasing The jaggy edges that appear in bitmap images with curves or lines at any angle other than multiples of 90°. Angle of view The extent of the view taken in by the lens. It varies with focal length for any particular format size. The angle made at the lens across the image diagonal. Aperture (of lens) Size of the lens opening through which light passes. The relative aperture is calibrated in f-numbers, being the diameter of the beam of light allowed to pass Auto-focus (AF) System by which the lens automatically focuses the image of a selected part of your subject. Av Aperture value. AE camera metering mode by which you choose aperture, and the metering system sets shutter speed (also called aperture priority). `B' setting Brief or bulb. On this setting the camera shutter stays open for as long as the release button remains depressed. Background printing A printing method that allows the user to continue working whilst an image or document is being printed from a computer. Batch processing Refers to a function or a series of commands being applied to several digital files at one time. This function is useful for making the same changes to a folder full of images. In Photoshop Elements, this function is found under the File menu and is useful for converting groups of image files from one format to another. Bit Stands for `binary digit' and refers to the smallest part of information that makes up a