Operation Manual

aperture priority A setting on certain cameras that automatically sets the shutter speed
for a correct exposure based on the aperture setting provided by the photographer. See
also exposure, shutter priority.
archive The process of storing image data on a permanent medium, such as optical
media (CD or DVD).
aspect ratio The ratio of height to width of the dimensions of a photograph. Common
North American aspect ratios are 3.5 x 5, 4 x 6, 5 x 7, 11 x 14, and 16 x 20 inches.
audio attachment An audio file that has been attached to an image, either in the camera
that captured the image or within Aperture. Audio attachments are often audio notations
recorded by the photographer while shooting an image.
audio clip An instance of a segment of audio in Aperture; an audio file’s version. See also
audio file, version.
audio file The source media file on disk to which an audio clip in Aperture refers; the
audio clip’s master. See also audio clip, master.
autofocus The system within the camera that automatically focuses the lens on a specific
portion of the subject or scene. See also autofocus point overlays.
autofocus point overlays Overlays displayed over images in the Viewer that show which
autofocus mode was used by the camera and which focal point was used to focus the
image when it was captured. You turn on autofocus point overlays by clicking the
Autofocus Points button in the Camera Info pane of the Metadata inspector. You can also
temporarily view autofocus point overlays by placing the pointer over the Autofocus
Points button. See also autofocus.
automatic bracketing A setting on many professional cameras that automatically brackets
the exposure of the image. See also bracketing.
background The area in the rear of the image that appears behind the subject. See also
depth of field, foreground.
backlighting A light source that faces toward the lens of the camera, emanating from
behind the subject. Backlighting makes the outline of the subject stand out from the
background, often resulting in a silhouette. See also frontlighting, sidelighting, silhouette.
badge overlay A small icon Aperture places on an image to indicate that an adjustment,
keyword, or other change has been applied to it. See also adjustment, keywords, offline.
876 Glossary