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Skill Level: Novice
Glossary: D
Dedicated Line
A dedicated line is a permanent connection to the Internet using
an individual, separate phone line.
DHTML
Stands Dynamic Hypertext Mark-up Language. DHTML is an HTML extension
that allows web pages to react to the end users' input, such as
displaying a web page based on the type of browser or computer end
users are viewing a page with.
Directory
A directory (such as Yahoo, commonly mistaken for a search engine)
depends on people for listings. The main difference between a search
engine and a directory is that a directory does not make use of
a spider or robot. One of the defining characteristics of a directory
is that it is usually divided into categories.
Dithered/Dithering
In order to display a full-color graphic image on a 256-color monitor,
computers must simulate the colors it cannot display. They do this
by dithering which is combining pixels from a 256-color palette
into patterns that approximate other colors. At a distance, the
human eye merges the pixels into a single color. Up close, the graphic
image will appear pixelated and speckled.
DNS
Stands for Domain Name System. The DNS translates URL text
addresses (such as grantasticdesigns.com) into a numeric Internet
address (such as 201.214.12.6).
Doorway Page
Web pages created specifically for search engine positions.
Also known as gateway page or a bridge page.
DPI
Stands for dots per inch. DPI specifies the resolution
of an output device, such as a printer or printing press machine.
Print resolution usually runs from 300-1200 dots per inch on a Laser
Printer and 125-225 dots per inch for photographic images on a print
brochure. (For information on input device measurements see ppi.)
Duotone
The application of two colors to provide richer tones than
a monotone (single-color image, usually grayscale) can provide.
A good duotone image can simulate a wider range of the color spectrum
than two colors used separately. Duotones also use a hue (color)
to set the mood for a photo in a more stunning way than a full-color
image can.
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