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A-buffer

Overview page. Subjects: Computing.

A buffer used with a Z-buffer to hold information concerning the visible transparent surfaces to be considered at eachpixel of an image. The A-buffer originated in an...

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achromatic line

Overview page. Subjects: Earth Sciences and Geography.

In the three-dimensional graph which plots quantities of the three additive primary colours contributing to pixels against each other, the line which runs at 45° to the axes. Pixels which...

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area filling

Overview page. Subjects: Computing.

Painting a defined area with a specific color or pattern. If the area is defined by a set of boundary pixels, there are specific algorithms for area filling starting from a seed pixel...

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bitmap

Overview page. Subjects: Computing.

A graphic which is made up of a number of pixels. An example of a bitmap format is the Graphics Interchange Format. See bitmapped graphic.

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bits per pixel

Overview page. Subjects: Computing.

The number of bits used to define the gray-scale value or color value of a pixel. Modern color systems often have 24 or 48 bits per pixel giving 256 or 65 536 possible values for each of...

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Bresenham's algorithm

Overview page. Subjects: Computing.

An algorithm that efficiently calculates the pixel positions needed to define a specified line using only integer arithmetic.

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broadcast quality

Overview page. Subjects: Media Studies — Computing.

A standard set of criteria by which television engineers judge whether a programme is technically fit or unfit to be broadcast. These include, on tape-based formats, the picture and audio...

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charge-coupled device

Overview page. Subjects: Astronomy and Astrophysics — Computing.

(CCD)

A light-sensitive semiconductor used to enhance images obtained from faint objects. It accumulates and temporarily stores charge at particular pixel locations when struck by...

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colour depth

Overview page. Subjects: Computing — Media Studies.

The number of colours that can be displayed in a pixel. The deeper the colour the larger the number of colours that can be used in a graphic but the slower it becomes to download it to,...

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contrast stretching

Overview page. Subjects: Earth Sciences and Geography.

In remote sensing, the artificial increase in range of digital number values of pixels in an image in order to increase contrast. See also decorrelation stretching; and edge enhancement.

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data compaction

Overview page. Subjects: Computing.

Removal of redundant information from a file or data stream. The term data compression is commonly used to mean the same thing, although, strictly, while compression permits the loss of...

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digital image

Overview page. Subjects: Medicine and Health — Science and Mathematics.

An image made up of pixels. Each pixel has numbers (digits) to describe its position and shade on the grey scale. The more shades available, described by the number of computer bits...

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digital number

Overview page. Subjects: Earth Sciences and Geography.

In remote sensing systems, a variable assigned to a pixel, usually in the form of a binary integer in the range of 0–255 (i.e. a byte). The range of energies examined in a remote sensing...

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dpi

Overview page. Subjects: Media Studies.

A unit of measurement representing the resolution of the output of computer printers or the input of image scanners in terms of the number of points per linear inch: the larger the number,...

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font

Overview page. Subjects: Computing.

A collection of alphabetic and other characters which are displayed in a certain style. There are thousands of fonts in existence, ranging from those such as Baskerville which have been in...

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graphic format

Overview page. Subjects: Computing.

A term synonymous with graphic file format.

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graphics mode

Overview page. Subjects: Computing.

A way of displaying images on a computer screen or other graphics device such that the basic unit is the pixel. Lines and characters on the screen are drawn pixel by pixel. The resolution...

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grey level

Overview page. Subjects: Earth Sciences and Geography.

A calibrated sequence of grey tones, ranging from black to white. In remote sensing, electromagnetic radiation falling on a photosensitive receiver generates an electrical current...

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grey scale

Overview page. Subjects: Medicine and Health.

(in radiology) a scale representing the possible gradient of densities from black to white for each pixel in an image. In an analogue image this gradient is smooth. A digital image has many...

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greyscale

Overview page. Subjects: Bibliography.

Of pictorial images: made up of pixels, each of which is black, white, or one of a number of shades of grey defined by the displaying system. Of character images ...

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