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Term
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Definition
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Absolute unit
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Font size definitions that use one of five standard units
of measurement.
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Animated GIF
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An image composed of several images that are displayed one
after the other.
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Client-side image map
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An image map that is stored in an HTML file.
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Color value
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A numerical expression that precisely describes a color.
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Dithering
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When a browser combines similar colors from its palette to
approximate the original color’s appearance.
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Dpi
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Dots per inch, a unit of measurement of the resolution of
an output device.
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Em unit
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A unit of measurement of font size, equal to the width of
the capital letter “M.”
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Ex unit
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A unit of measurement of font size, equal to the height of
the lowercase letter “x.”
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Flash
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A proprietary graphics format from Macromedia.
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Generic font
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A name for a general description of a font’s appearance.
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GIF
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Graphics Interchange Format; a commonly used graphics
format on the Web.
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GIF89a
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A GIF format that supports interlacing, transparent colors
and animation.
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Graphics Interchange Format
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See GIF.
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Hanging indent
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A paragraph format that extends the first line of text to
the left of the text block.
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Hexadecimal
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A number expressed in base 16, used to express color
values.
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Hotspot
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A specific area of a graphic that has its own link.
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Image map
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A tag that lists the boundaries of all hotspots in a
graphic.
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Interlaced GIF
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A GIF file that is saved and retrieved in stages.
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Interlacing
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The method by which a software product saves and retrieves
a GIF image.
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Joint Photographic Experts Group
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A graphics file format.
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Kerning
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The amount of space between pairs of letters.
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Leading
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The amount of space between lines of text.
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Macromedia
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Developer of Flash graphics format files.
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Noninterlaced GIF
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The process of saving a graphics file one line at a time.
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Palette
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A selection of colors.
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Pixel
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A unit of measurement that represents a single dot on an
output device.
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PNG
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Portable Network Graphics, a graphics file format.
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Portable Network Graphics
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See PNG.
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Progressive JPEG
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A JPEG format that creates effects similar to interlacing.
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Relative unit
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An expression of font size relative to the size of a
standard character.
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RGB triplet
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A representation of a color based on the percentages of
red, green, and blue.
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Safety palette
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A palette of colors that are guaranteed not to dither in
any Web browser.
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Scalable
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A process that allows a Web page to be rendered the same
way, no matter how a user’s output device is configured.
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Scalable Vector Graphics
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A graphics file format useful for creating line art.
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Server-side image map
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An image map that is stored on a Web server.
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Spacer
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A transparent GIF image used as a layout device in earlier
HTML files.
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Specific font
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A named font, such as Times New Roman, for example, as
opposed to a generic font style (serif, for example).
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Splash screen
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A Web page that contains links to other pages on the site,
but which contains no substantial content of its own.
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SVG
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See Scalable Vector Graphics.
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Tiling
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The process of repeating an image horizontally and
vertically until it fills up a page.
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Tracking
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The amount of spacing between words.
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Transparent color
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A color in a graphics file that is not displayed when the
image is viewed in an application.
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Watermark
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A fixed background image.
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Web-safe colors
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A palette of colors that are guaranteed not to dither in
any Web browser.
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