)The use of many shades of gray to represent an image. Continuous-tone images, such as black-and-white photographs, use an almost unlimited number of shades of gray. Conventional computer hardware and software, however, can only represent a limited number of shades of gray (typically 16 or 256). Gray-scaling is the process of converting a continuous-tone image to an image that a computer can manipulate.
While gray scaling is an improvement over monochrome, it requires larger amounts of memory because each dot is represented by from 4 to 8 bits. At a resolution of 300 dpi, you would need more than 8 megabytes to represent a single 8½ by 11-inch page using 256 shades of gray. This can be reduced considerably through data compression techniques, but gray scaling still requires a great deal of memory.
Many optical scanners are capable of gray scaling, using from 16 to 256 different shades of gray. However, gray scaling is only useful if you have an output device — monitor or printer — that is capable of displaying all the shades. Most color monitors are capable of gray scaling, but the images are generally not as good as on dedicated gray-scaling monitors.
Note that gray scaling is different from dithering. Dithering simulates shades of gray by altering the density and pattern of black and white dots. In gray scaling, each individual dot can have a different shade of gray.
)(1) The approximation of text characters on a screen display. Greeking is often used by word processors that support a preview function. In preview mode, the word processor attempts to show what a document will look like when printed. Frequently, however, the graphics display capabilities of the monitor are not sufficient to show text at […]
- green PC
A PC especially designed to minimize power consumption. Green PCs draw less power than normal PCs and support sleep modes, in which the computer powers down all unnecessary components when it is inactive.
1) The term greenfield was originally used in construction and development to reference land that has never been used (e.g. green or new), where there was no need to demolish or rebuild any existing structures. Today, the term greenfield project is used in many industries, including software development where it means to start a project […]
Short for global-regular-expression-print, a UNIX utility that allows the user to search one or more files for a specific string of text and outputs all the lines that contain the string. The user also has the option to replace the string with another. For example, on a UNIX command line, the user can enter grep […]
Programs that network users download and install on their computers — usually without permission from or knowledge of the IT department. While some greynet applications are often useful (for example, instant messaging, streaming media and RSS software, peer-to-peer file sharing, peer-to-peer collaboration and proxy applications), they can also include or malicious programs (such as spyware).