Apple Aperture 2 User Manual
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Glossary
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.
auto focus The system within the camera that automatically focuses the lens on a
specific portion of the subject or scene.
automatic bracketing A setting on many professional cameras that automatically
brackets the exposure of the image. See also
background The area in the rear of the image that appears behind the subject. See
also
.
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
,
,
.
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
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
complementary metal oxide semiconductor (CMOS)
,
.
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
,
.
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
.
Blank setting A Secondary Viewer setting that sets the Secondary Viewer display to be
a blank screen. See also