Vector and bitmapped representations have complementary strengths and weaknesses. A typical vector representation might build up a picture from straight lines, storing only the coordinates of the endpoints of each line. Bitmapping implies that each dot in the picture corresponds to one or more bits in the computer’s video memory.Īn alternative representation is to treat a picture as if it were composed of simple geometric shapes and record the relative positions of these shapes this is called a vector representation (see more under VECTOR GRAPHICS). The most natural representation for a picture inside the computer is therefore just a list of the colours for each dot in the output this is called a BITMAPPED representation. The most common graphical display devices are the CATHODE RAY TUBE inside a monitor, and the PRINTER, both of which present pictures as two-dimensional arrays of dots. Since a computer can ultimately deal only with binary numbers, pictures have to be DIGITIZED (reduced to lists of numbers) in order to be stored, processed or displayed. This distinction is lost now that almost all computers employ a GRAPHICAL USER INTERFACE. The term came into use when there was still a distinction between computers that could display only text and those that could also display pictures. Pictures on a computer display or the process of creating pictures on a computer display.
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