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A
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| Aliasing |
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Aspect
Ratio |
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Jagged edges in text and also
along the outer boundaries of diagonal or curved objects. Anti aliasing refers to
software adjustments that correct this effect. (see figure a-1) |
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The ratio of height to width
of a frame or screen. The aspect ratio for video is 3:4 |
| ANSI |
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Amercian National Standards
Institute, sets standards for measurements
ANSI Lumens, when measured using ANSI methods; ANSI Lamp Code=used as 3 letter code
such as ENX. |
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B
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| Bandwidth |
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Bit-Mapped
Graphics |
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The capacity of any single
channel of the system to transmit data. |
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A form of graphics that are
defined and addressed on a bit by bit basis, thereby making all points on the screen
display directly accessible. |
| Baud |
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The commonly used unit of
speed that describes the rate at which binary data is transmitted. One baud is approximately
equal to one bit per second. |
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C
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| Cable |
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Color
Mapping |
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Wires and cords used to power
and link various pieces of equipment. |
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A method of translating many
video display monitor colors into fewer LCD projection panel colors. |
| CD-ROM |
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Color
Palette |
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Compact disc - read only memory.
A 4.75 inch laser encoded storage dicc. CD-ROMs can hold up to 650 megabytes of information. |
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The total number of colors
possible. Sometimes referred to in bits. (8-bit, 16-bit, 24 bit, etc.) |
| CGA |
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Contrast
Ratio |
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Color Graphics Adapter. |
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The ratio of maximum white
to minimum black level possible for a particular spot on the image with the background
light levels factored out. |
| Color
Contrast |
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Refers to the values relationship
of two colors used in conjunction within a slide, e.g. yellow letters on a blue background.
Contrast is required for readability of text, charts and graphs - the more contrast
the better the readability. (see
figure c-1) |
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D
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| Data
Rate |
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Digitize |
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The rate or speed at which
data is transmitted. |
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To convert analog information
into digital information. |
| Depth
of Focus |
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Display |
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A measure of an imaging system
to keep an image in focus when the object plane is NOT thin. |
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A screen that electronically
presents numbers, characters, graphics, etc. transmitted from a personal computer. |
| Device
Driver |
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Distortion |
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Software that allows the computer
to communicate with a peripheral device, such as a printer, videodisc player, or
CD-ROM player. |
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A modification of the original
signal appearing in the output. |
| Digital
Video |
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Dithering |
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Video where all the instructions
for the images are in computer data form, i.e. bits. |
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Refers to the technique of
mixing up neighboring pixels or consecutive frames of pixel information in a random
fashion to create the effect of many intermediate levels of color. |
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E
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| Enhancement |
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Adding to the quality of the
basic image with special effects, gradations, interpolations, logos, etc. |
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