ATI Technologies FIRE GL1 User's Guide download pdf (Page 47)

Glossary

CGA

IBM Color Graphics Adapter, one of the first color graphics standards. Either

320x200 pixels with four colors or 640x200 pixels with two colors can be displayed.

Chrominance

Portion of a video signal that corresponds to color values and includes information

about hue and saturation. This color component essentially complements the

brightness or luminance component of a color video picture.

Clipping

Limiting the drawing area to any rectangular area by cutting its edges.

Color Display

Type of monitor capable of displaying information in color. It is often called an RGB

(red, green, blue) monitor, referring to the signals needed to drive it.

Contrast

The contrast of an image is the difference between light and dark. A contrast-

intensive image is one in which contains strong transitions from light to dark. A

contrast-weak image contains transitions that are hardly noticeable.

CPU

Central Processing Unit, which is the main processor chip of a computer, e.g.

Pentium.

D/A converter (DAC)

Converts digital input signal to analog output signal, e.g. image data in the display

memory of the graphics board is converted to video signal for the monitor to

display.

DDC (Display Data Channel)

The VESA Display Data Channel provides a serial data channel between the monitor

and the graphics card - if both, monitor and graphics card support DDC and the

monitor data cable includes the additional DDC wire. DDC support automatically

transfers monitor data (e.g. type, name, max. horizontal frequency, timing definitions)

to the graphics card. The graphics card may also send instruction to the monitor via

the DDC line.

There are different DDC standards: DDC1, DDC2B, and DDC2AB.

Default Mode

Capabilities, resolutions and display mode the system operates with when you start

your computer.

Delta frame

Frame containing only the data that has actually changed since the last frame. Delta

frames are an efficient means of compressing image data. Compare key frame.

Digital

(1) Method of representing sound or other waves as a series of binary numbers. (2)

Tuning method for radios in which the desired freq. is set by digital calculation. (3)

Numeric display of information. Compare analog.

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ATI Technologies FIRE GL1 User's Guide Page 47