A pattern of horizontal lines displayed on a computer or TV monitor. As the part of a monitors screen that is actually being used to display images, its a bit smaller than the physical dimensions of the display screen itself. It varies for different resolutions. Most monitors have controls that allow you to move or resize the raster.
A technology whereby the display can be conceptualized as a vast grid of tiny points called pixels. In a lower resolution raster monitor, there are 320 horizontal pixels and 240 vertical pixels for a total of 76,800. Every possible image presented in this technology is a combination of those pixels, and there are, therefore, a finite number of possible combinations.
a rectangular array of values, or cells, or pixels; a common data format for representing and displaying maps and images