Encoding images keywords

Description

Includes keywords such as resolution and colour depth .
Sally_Tisdall.020101
Flashcards by Sally_Tisdall.020101, updated more than 1 year ago
Sally_Tisdall.020101
Created by Sally_Tisdall.020101 over 10 years ago
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Resource summary

Question Answer
Metadata Data about data
Colour Depth Colour depth is the number of alternative colours that a pixel can use. Measured in bits , the number of bits indicates how many colours are available for each pixel. For example 1 but gives 2 colours , white and black .
Raster graphics Also known as pixelmaps or bitmap graphics , are commonly used in digital cameras and are organised as a grid of coloured squares called pixels .
Vector graphics or images Uses shapes to precisely define the parts of the image. .It is more efficient than bitmaps because it does not need to store every pixel as a bitmap does. Vector images can be changed without losing resolution.
Bitmap graphics Also known as pixelmaps or raster graphics , are commonly used in digital cameras and are organised as a grid of coloured squares called pixels .
Resolution Resolution is a measure of how many pixels are used in a given area. They tell you how dense (and therefore how detailed ) an image is .It is measured in dots per inch (dpi).
Pixel An individual unit (often called a dot) that makes up an image .
Unicode A worldwide encoding system used with different languages in which each letter, digit, or symbol is given a unique numeric value that applies across different platforms and programs.
ASCII code (American Standard Code for Information Interchange) Is the most common format for text files in computers and on the Internet .
Parity Checking The use of parity bits to check that data has been transmitted accurately. The parity bit is added to every data unit (usually seven or eight bits ) that are transmitted.
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