Bitmap Definition A bitmap (or raster graphic) is a digital image composed of a matrix of dots. When viewed at 100%, each dot corresponds to an individual pixel on a display. In a standard bitmap image, each dot can be assigned a different color. Together, these dots can be used to represent any type of rectangular picture. There are several different bitmap file ..
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JFS Definition Stands for “Journaled File System.” JFS is a 64-bit file system created by IBM. The initial version of JFS (also called JFS1) was developed for IBM’s AIX operating system and was released in 1990. In 2001, IBM released JFS2 (the Enhanced Journaled File System), as well as a version of JFS that is compatible with the Linux operating system. ..
Shell Definition Most people know of shells as small protective coverings for certain animals, such as clams, crabs, and mollusks. You may also find a shell on the outside of an egg, which I highly recommend you remove before eating. In the computer science world, however, a shell is a software program that interprets commands ..
Host Definition A host is a computer that is accessible over a network. It can be a client, server, or any other type of computer. Each host has a unique identifier called a hostname that allows other computers to access it. Depending on the network protocol, a computer’s hostname may be a domain name, IP address, or simply a unique text string. ..
Terminal Definition The word “terminal” comes from early computer systems that were used to send commands to other computers. Terminals often consist of just a keyboard and monitor, with a connection to another computer. The purpose of a terminal is not to process information (like a typical computer), but to send commands to another system. ..
CRT Definition Stands for “Cathode Ray Tube.” CRT is the technology used in traditional computer monitors and televisions. The image on a CRT display is created by firing electrons from the back of the tube to phosphors located towards the front of the display. Once the electrons hit the phosphors, they light up and are ..
Monochrome Definition The word “monochrome” literally means “one color.” Therefore, a monochrome image only includes one color, but may contain many shades. In computing, “monochrome” typically refers to a two-tone image, rather than one with several shades of a single color. For example, a monochrome monitor uses one color for the background and another to display text ..
Halftone Definition A halftone, or halftone image, is an image comprised of discrete dots rather than continuous tones. When viewed from a distance, the dots blur together, creating the illusion of continuous lines and shapes. By halftoning an image (converting it from a bitmap to a halftone), it can be printed using less ink. Therefore, many newspapers ..
CMYK Definition Stands for “Cyan Magenta Yellow Black.” These are the four basic colors used for printing color images. Unlike RGB (red, green, blue), which is used for creating images on your computer screen, CMYK colors are “subtractive.” This means the colors get darker as you blend them together. Since RGB colors are used for light, not ..
WYSIWYG Definition Stands for “What You See Is What You Get,” and is pronounced “wihzeewig.” WYSIWYG refers to software that accurately represents the final output during the development phase. For example, a desktop publishing program such as Photoshop is a WYSIWYG graphics program because it can display images on the screen the same way they will look when printed on paper. Word ..
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