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

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.

bitmap

A binary representation in which a bit or set of bits corresponds to some part of an object such as an image or font. For example, in monochrome systems, one bit represents one pixel on screen. For gray scale or color, several bits in the bitmap represent one pixel. The term may refer to the image itself or to the memory area that holds the bits that represent the image. See pixel and rasterize.

Graphics and Tables
A bitmap is usually associated with graphics, in which the bits are a direct representation of the pixels in the image. However, bitmaps can be used as tables to represent and keep track of anything, where each set of bits is assigned a value or condition. See bitmapped graphics. For graphics fundamentals, see graphics.


A Monochrome Bitmap
The left half of this diagram shows the bits in the bitmap, and the right half depicts what would show on screen. In monochrome systems, one bit is used to represent one pixel. Images that are scanned into the computer are turned into bitmaps, and bitmaps can be created in a paint program.
References in periodicals archive ?
In order to understand this principle, it is important to know the structure of file used in steganography For example, the detailed description of bitmap's RGB (i.e., Red-Green-Blue) system, the impact of inserting additional information on visual information in image, and the explanation of the detailed process of inserting information in a BMP image are given in [21].
Section 4 describes how the bitmap in the routing table and the prefix cache can be managed in our scheme.
Each bitmap file contains a bitmap-file header, a bitmap-information header, a color table, and an array of bytes that defines the bitmap bits.
For tech pubs and the like, the toolkit lets users create high-quality vector illustrations and bitmaps, change and even create materials for individual objects in the 3D design, add or change lighting, create animations and exploded views.
TELECOMWORLDWIRE-17 May 2005-Sorrent brings games from The Bitmap Brothers to mobile(C)1994-2005 M2 COMMUNICATIONS LTD http://www.m2.com
Because a bitmap uses a fixed or raster graphics method of specifying an image, the image cannot he immediately rescaled by a user without losing definition.
It delivers multimedia content to CDs, DVDs, Intranets, kiosks of the Internet and supports most major video, audio, bitmap, 3D and vector formats.
However, working with vector graphics is not the same as working with bitmaps and often the transposition between the two formats can be confusing.
* both print and save functions are provided so that the analysis results can be recorded as bitmaps for use in other programs and documents, such as MS Word or PowerPoint;
Enhanced graphics-handling capability included with the upgrade aids engineers who use high-resolution bitmaps as the basis of their virtual prototypes.
Selections can be sent to the Windows clipboard as Enhanced Metafiles and bitmaps or saved to file for use in www and other documents.
A compression format developed by CompuServe using Unisys's patented LZW (Lempel-Ziv-Welch) technique, GIF files are bitmaps composed of individual pixels.