bitmap

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bitmap

Computing

a picture created on a visual display unit where each pixel corresponds to one or more bits in memory, the number of bits per pixel determining the number of available colours

Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005

bitmap

(graphics, file format)

A data file or structure which corresponds bit for bit with an image displayed on a screen, probably in the same format as it would be stored in the display's video memory or maybe as a device independent bitmap. A bitmap is characterised by the width and height of the image in pixels and the number of bits per pixel which determines the number of shades of grey or colours it can represent. A bitmap representing a coloured image (a "pixmap") will usually have pixels with between one and eight bits for each of the red, green, and blue components, though other colour encodings are also used. The green component sometimes has more bits that the other two to cater for the human eye's greater discrimination in this component.

See also vector graphics, image formats.

This article is provided by FOLDOC - Free Online Dictionary of Computing (foldoc.org)

References in periodicals archive ?

You must be careful when enlarging bitmapped graphics.

In addition to the black-and-white bitmapped image, the anchor image can be presented as a grayscale bitmapped image, as shown in Figure 3 (p.

In certain cases you would want to use bitmapped images.

In contrast to bitmapped graphics, vector graphics do not contain pixels; rather, they are composed of shapes.

With a graphics program, vector graphics can be created automatically from a bitmapped file.

If you save an image using a vector graphic file format, you can change the file to a bitmapped file format.

* Encapsulated PostScript format (.EPS) -- This file format can contain bitmapped graphics.

Although this file format can contain bitmapped graphics, it usually contains vector graphics.

* WordPerfect/DrawPerfect graphic (.WPG) -- This format can handle either vector or bitmapped graphics.

If so, you will probably be using a bitmapped graphics file format.

When creating graphics files for your SGML documents, determine which major graphics file type (bitmapped or vector) is better suited to your needs.