Graphics and images:
In multimedia presentations the images should be clear and concise without distracting lines and backgrounds. Complex designs should be used only if they are central to the theme of the system. There are two kinds of image files: vector images and bitmaps. Vector images define the picture using mathematical properties of coordinates, length, or size. They result in very small files, but the pictures are not photo-realistic. Bitmap files represent the image as a series of dots or pixels and store information about the color of each pixel. Bitmap images produce high-resolution, clear images, but the files are quite large. Compression is often used to reduce the file size. Some popular formats for compressed files are Graphics Interchange Format (GIF) and Joint Photographic Experts Group (JPEG and JPG). Software is available that allows the designer to draw vector images, create the bitmaps, scan designs or pictures created elsewhere, and edit or crop any digital image. See also: Data compression
Pauline K. Cushman, Robert A. Kolvoord, "Multimedia technology", in AccessScience@McGraw-Hill, http://www.accessscience.com
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