Apple Aperture - Manual (Page 439)

Glossary 439
digital noise Misinterpreted pixels occurring as the result of high ISO settings; also
known as chrominance signal-to-noise ratio. Random bright pixels, especially in solid
colors, are the result of digital noise. See also
ISO speed .
digital point-and-shoot camera A lightweight digital camera with a built-in autofocus
feature, aptly named for the two steps required of the photographer to capture an
image. The lens, aperture, and shutter are one assembly that is usually irremovable
from the camera. See also
camera , digital single-lens reflex (DSLR) camera .
digital single-lens reflex (DSLR) camera An interchangeable-lens camera where the
image created by the lens is transmitted via a reflexing mirror through a prism to the
viewfinder, and the viewfinder image corresponds to the actual image area. The mirror
reflexes, or moves up, so as not to block the digital image sensor when the shutter is
open. See also
camera , digital point-and-shoot camera .
digitization The process of converting an analog voltage value to a digital value.
digitize A term often used by photographers for converting images captured on film
into a digital format, such as TIFF, using a film scanner.
disclosure triangle A small triangle you click to show or hide details in the
Aperture interface.
display The computer’s monitor.
distort Performing an adjustment that changes the shape or composition of an image.
See also
effects .
dodging The process of limiting the exposure of a specific portion of an image (the
opposite of burning-in). Dodged areas in an image appear brighter than if they were
exposed for as long as the rest of the image. See also
burning , effects , exposure .
dot gain A printing press term used to describe the enlargement of half-tone dots as
ink is absorbed into paper. Dot gain can affect the quality of an image’s appearance by
reducing the amount of white reflected off the paper.
dots per inch (dpi) A printer resolution measurement that refers to the maximum
number of dots within a square inch. See also
print , resolution .
drift Changes in the way a device reproduces color over time. For example, the age of
inks and type of paper can cause a printer’s color output to drift. See also
device
characterization , gamut .
drop shadow An effect that creates an artificial shadow behind an image. Typically
used on websites and in photo albums to create the illusion of three dimensions.
dust and scratch removal The process of digitally removing the blemishes caused by
dust and scratches on film scans.