D


definition

The clarity of details in an image. See also resolution.



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 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. Desaturation of 100 percent 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.



Detail Images panel

Area of the Webpage Editor where images can be clicked to display a detailed view.



device characterization

The process of creating a unique, custom profile for a device, such as a monitor or printer. Characterizing a device involves specialized dedicated hardware and software to determine the exact gamut of the device. See also calibration.



device dependent

Refers to color values that are contingent on the ability of a device to reproduce those colors. For example, some colors on a display are not capable of being produced by a printer. The colors on the display are outside the gamut of the printer and are thus device dependent. See also gamut.



device independent

Describes standard color spaces, like CIELAB and XYZ, in which the interpretation of a color is not dependent on a specific device. See also color space, Commission Internationale de l'Eclairage (CIE).



diffused lighting

Light scattered across a subject or scene. Diffused lighting results in low contrast and detail, as seen in images captured outdoors on an overcast day. See also contrast.



digital

A description of data stored or transmitted as a sequence of 1s and 0s. Most commonly, refers to binary data represented by electronic or electromagnetic signals. JPEG, PNG, RAW, TIFF, and Adobe DNG files are all digital.



digital camera

A camera that captures images in an image sensor rather than on film. The images can then be downloaded to a computer.



digital image sensor

Located at the image plane inside a camera, it is a computer chip that converts the light it senses into data by measuring the levels of red, green, and blue and assigning values to each pixel in the image. See also charged-coupled device (CCD), complementary metal oxide semiconductor.



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 after the two steps required of the photographer to capture an image. The lens, aperture, and shutter are one assembly, usually irremovable from the camera. See also camera, digital single-lens reflex (DSLR) camera.



digital single-lens reflex (DSLR) camera

An interchangeable-lens camera in which the image created by the lens is transmitted by a reflexing mirror through a prism to the viewfinder. The mirror reflexes, or moves up, so as not to block the digital image sensor when the shutter is open.



disclosure triangle

A small triangle that is clicked 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.



dodging

Limiting the exposure of a specific portion of an imagethe opposite of burning. Dodged areas appear brighter than the rest of an image. See also burning, effects, exposure.



dot gain

A printing press term used to describe the enlargement of halftone dots as they are 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 value referring to the maximum number of dots within a square inch. See also resolution.



drift

Changes in the way a device reproduces color over time. 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

See Spot & Patch.



dye sublimation

A type of printer that creates images by heating colored ribbon to a gaseous state, bonding the ink to the paper.






Apple Pro Training Series. Getting Started with Aperture
Apple Pro Training Series: Getting Started with Aperture
ISBN: 0321422759
EAN: 2147483647
Year: 2003
Pages: 110

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