Apple Aperture - Page 438

438 Glossary
densitometer An instrument designed to measure the optical density of photographs.
See also device characterization.
density The ability of an image to reproduce distinct dark colors. An image with high
definition in the darker colors is referred to as dense. See also contrast, flat.
depth of field The area of the image that appears in focus from the foreground to the
background. Depth of field is determined by a combination of the opening of the
aperture and the focal length of the lens. See also aperture, background, focal length,
foreground.
desaturate To remove color from an image. Complete desaturation results in a
grayscale image. See also saturation.
destination profile The working-space profile that defines the results of a color
conversion from a source profile. See also profile.
device characterization The process of creating a unique, custom profile for a device,
such as a display or printer. Characterizing a device involves specialized dedicated
hardware and software to determine the exact gamut of the device. See also
calibration, gamut.
device dependent Color values that are contingent upon the ability of a device to
reproduce those colors. For example, some colors produced by displays cannot be
reproduced on paper by a printer. The colors produced by the display are outside the
gamut of the printer. Therefore, those colors are considered to be device dependent.
See also gamut.
device independent Standard color spaces, such as CIE Lab and XYZ, where the
interpretation of a color is not dependent on a specific device. See also color space,
Commission Internationale de l’Eclairage (CIE).
diffused lighting A type of light that is scattered across the subject or scene. Diffused
lighting results in an image with low contrast and detail, as seen in images captured
outdoors on an overcast day. See also contrast, flat.
digital A description of data that is stored or transmitted as a sequence of ones and
zeros. Most commonly, refers to binary data represented using electronic or
electromagnetic signals. JPEG, PNG, RAW, and TIFF files are all digital. See also
digitization.
digital image sensor The computer chip located at the image plane inside the camera
that consists of millions of individual light-sensitive elements capable of capturing
light. See also camera, charge-coupled device (CCD), complementary metal oxide
semiconductor (CMOS), megapixel.