BibTeX
@MISC{Ghica_geometryand,
author = {Dan R. Ghica},
title = {Geometry and modeling ON-SCREEN RENDERING},
year = {}
}
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Abstract
Computer graphics (CG) is the application of computers to generating and processing im-ages. Computer graphics encompasses 2D (flat) graphics, 3D (spatial) graphics and anima-tion. Tasks in CG can be divided into two major concerns: •rendering: the way images are drawn on the graphical device (screen, printer, or other) •modeling: the way graphical objects are represented in the computer. The most common rendering device is the computer screen. A computer screen (either CRT or LCD) is organised as a raster of pixels. Each pixel has a location in the raster and a colour. The number of pixels available and their “depth ” (the number of colours they can display) increased greatly in time. CGA (1981) was the first standard for IBM PCs. It had a resolution of 640 X 200 monochrome or 320 X 200 in 4 colours. Today’s displays have (commonly) 1,024 X 768 pixels or more, with millions of colours per pixel. The basic idea, however, is the same: on-screen rendering is done by giving colour values to the pixels in the raster. For example, suppose you want to draw a circle: If the pixels are very small then what you see looks like a circle, but if you magnify to a level where you can see individual pixels the circle actually looks something like this: Dan R. Ghica •
