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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)

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.
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References in periodicals archive
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Study on multimedia teaching platform of "Principles of Management" based on cloud computing
Algorithm for Bitmap Indexing Input: [C.sub.i] is the Collection name, [A.sub.i] is attribute name, [C.sub.q] is the collection in access schema Output: Subset of the query for each attribute [A.sub.i] in [C.sub.n] if [A.sub.i] in Q is indexed then [A.sub.b]=[A.sub.i] else return NULL endif if [A.sub.b] has matches in [C.sub.q] continue while [A.sub.b] is in [C.sub.q] set bitmap index as 1 else set bitmap index as 0 end if end for In this algorithm, collections, collection name specified in access schema and attribute name is given as input.
Scale independent query processing using optimal access schema
Further on, iterations 1-3 are interpreted, so that after the composing of a detailed image, we are testing if the end frame bitmap is received.
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The examples of bitmap samples of different sizes used for training and testing are shown in Figure 3.
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Among the special features of Fireworks CS3 includes a common library of pre-built assets, quick vector artwork and bitmap images editing and seamless integration with Adobe Photoshop, Adobe Illustrator, Adobe Dreamweaver and Adobe Flash.
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