Apple Aperture 3.5 - Manual (Page 502)

Glossary 502
audio file The source media file on disk to which an audio clip in Aperture refers; the audio clip’s
original. See also audio clip, original.
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 photos in the Viewer that show which
autofocus mode was used by the camera and which focal point was used to focus the photo
when it was captured. You turn on autofocus point overlays by clicking the Autofocus Points
button in the Camera Info pane of the Info 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 photo. 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 a photo to indicate that an adjustment, keyword,
or other change has been applied to it. See also adjustment, keywords, offline.
Bayer pattern color filter array A specific arrangement of red, green, and blue lenses attached to
the surface of a digital image sensor. There are roughly twice as many green lenses as blue and
red to accommodate how the human eye perceives color. See also charge-coupled device (CCD),
complementary metal oxide semiconductor (CMOS), digital image sensor.
bit depth The number of tonal values or shades of a color each channel in a pixel is capable of
displaying. Increasing the bit depth of color channels in an image’s pixels exponentially increases
the number of colors each pixel can express. See also color channels, color depth.
Black & White adjustment An adjustment in Aperture that allows you to selectively control the
source red, green, and blue color channels when a color image is converted to grayscale. See also
adjustment, grayscale, image, monochrome.
black point compensation Black point compensation ensures that black and white luminance
values are appropriately scaled to fit within the range or gamut of the destination device (printer,
paper, and ink). Using black point compensation helps prevent clipping in shadows because the
blacks are scaled to fit within the gamut of the printer, paper, and ink.
Black Point parameter An Exposure adjustment parameter in Aperture used to set the blacks in
the image. See also Exposure adjustment.
Black setting A secondary Viewer setting that sets the secondary Viewer display to be a blank
screen. See also display, secondary Viewer.
Blur Quick Brush A type of Quick Brush adjustment that softens the area of the image the
adjustment is brushed on. See also adjustment, Brush HUD, Quick Brushes.
bounce lighting Natural and unnatural light sources (flash and tungsten) redirected toward the
subject using a reflective surface to give the effect of natural light as well as fill-in shadows. See
also color temperature, fill-in lighting, White Balance adjustment.
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