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Term of the Day:
COBOL


resolution
bit map
dpi
monitor
optical resolution
pixel
printer
raster
video adapter

Refers to the sharpness and clarity of an image. The term is most often used to describe monitors, printers, and bit-mapped graphic images. In the case of dot-matrix and laser printers, the resolution indicates the number of dots per inch. For example, a 300-dpi (dots per inch) printer is one that is capable of printing 300 distinct dots in a line 1 inch long. This means it can print 90,000 dots per square inch.

For graphics monitors, the screen resolution signifies the number of dots (pixels) on the entire screen. For example, a 640-by-480 pixel screen is capable of displaying 640 distinct dots on each of 480 lines, or about 300,000 pixels. This translates into different dpi measurements depending on the size of the screen. For example, a 15-inch VGA monitor (640x480) displays about 50 dots per inch.

Printers, monitors, scanners, and other I/O devices are often classified as high resolution, medium resolution, or low resolution. The actual resolution ranges for each of these grades is constantly shifting as the technology improves.

Video RAM Required for Different Resolutions


Resolution
256 colors (8-bit)
65,000 colors (16-bit)
16.7 million colors (24-bit, true color)
640x480512K 1 MB1 MB
800x600512K 1 MB2 MB
1,024x7681 MB 2 MB4 MB
1,152x1,0242 MB 2 MB4 MB
1,280x1,0242 MB 4 MB4 MB
1,600x1,2002 MB 4 MB6 MB


For internet.com pages about resolution, . Also, check out the following links!


More Information

  University of Paris Imaging Tutorial
A french reference for digital images. It is in french, but there are a lot of step-by-step visual examples.

  Video Modes, Resolution and Color
Describes the technical details of video modes and signals, as well as the major characteristics of the video image. This page is from "The PC Guide."

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