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650 Glossary
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).
Devignette adjustment An adjustment in Aperture used to correct unwanted
vignetting applied to the image at the time it was captured. See also Vignette
adjustment, vignetting.
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.
digital master file See master.
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, noise reduction.
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.