binary 2b Flashcards
What is a character set
A character set is a collection of characters used to represent text in a computer system
How do you work out the file size of the image?
Width x height x colour depth
What is a Pixel
Digital images can be made by putting together lots of tiny squares, known as pixels - short for picture element.
What is a bitmap
A bitmap is a method for storing images using pixels.
What is resolution
Resolution indicates the number of pixels that are displayed per inch for an image
What is bit depth
Bit depth. refers to the number of bits. used to record each sample.
What is colour depth
Colour depth refers to the maximum number of colours an image can contain.
What is metadata?
he data providing information about one or more aspects of the data
What is sample interval
The time taken between each sample measured in seconds
What is sample rate?
The amount of samples per second measured in hertz
What is amplitude?
Where the y and x axis meet on an analogue signal
What is analogue sound
Continuously changing sound signals which can be found in the nature
What is lossy compression
Lossy compression is where some data is lost and can’t be recovered.
It greatly reduces the file size but also the image/sound quality.
Suitable for images sound and videos
Cannot be used on text and executable files
What is lossless compression
In lossless compression no data is lost as its encoded differently.
It can be turned back to the original format and be used on all data types.
Less effective than lossy compression at reducing file size
Suitable for documents and executable files
