Glossary of Terms - characters and images

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  • Created by: kenyone
  • Created on: 28-03-16 14:51
character set
a complete set of letters, numbers, symbols, and control codes that can be used by a computer
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ASCII
American Standard Code for Information Interchange: a 7-bit character set used by PCs. (There is also an extended ASCII character set that uses 8 bits.)
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EBCDIC (pr. eb-sid-ic)
Extended Binary Coded Decimal Interchange Code: an 8-bit character set used by older mainframes.
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Unicode
A 16-bit character set that allows many more characters to be coded.
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Bitmap image
An image that has been stored as a series of values per pixel. The colour of each individual pixel is stored in a file.
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Vector graphic
An image file that is made up of lines/shapes that have certain properties, (i.e: start-point, end-point, line colour, line thickness, line style.) The properties of each shape are stored in a file to make up the image.
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Pixel
Short for picture element. It is the smallest component of a bit-mapped image.
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Colour depth
The number of bits used to represent the colour of a single pixel in a bitmapped image. Higher colour depth gives a broader range of distinct colours. An image using 8 bits per pixel could use 256 different colours.
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Resolution
The number of pixels in an image expressed as: the-number-of-pixels-across x the-number-of-pixels-down eg: 400 x 600.
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Metadata
Data about data. In the case of image files metadata is the data the computer needs to interpret the image data in the file, for example: resolution, colour depth and image dimensions.
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Other cards in this set

Card 2

Front

ASCII

Back

American Standard Code for Information Interchange: a 7-bit character set used by PCs. (There is also an extended ASCII character set that uses 8 bits.)

Card 3

Front

EBCDIC (pr. eb-sid-ic)

Back

Preview of the front of card 3

Card 4

Front

Unicode

Back

Preview of the front of card 4

Card 5

Front

Bitmap image

Back

Preview of the front of card 5
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