Compression

Question 1

Define compression

Answer 1

The name given to algorithms which reduce file size

Question 2

What are the two types of compression

Answer 2

Lossy and lossless

Question 3

What does lossy compressions cause

Answer 3

Small mistakes (digital artefacts) appearing in image and video

Question 4

How does lossless compression work

Answer 4

It doesn’t lose any data, but rather it finds groups of repeating data and records the data once, along with the number of repetitions.

Question 5

How does Run length encoding work

Answer 5

It Uses data pairs to Encode each run length of the same pixel

Question 6

How to decrease file size

Answer 6

Reduce:
Colour depth and resolution
Or
Sample resolution and rate

Question 7

Benefits of compression

Answer 7

Smaller files
Faster transmission time
Faster download
Reduces space on disk/servers
Image inside web can loaf Faster

Question 8

Examples of lossy file formats

Answer 8

Jpeg
Mp4
Mp3

Question 9

Examples of lossless file format

Answer 9

Png
Zip
Gif
Flav/ALAC

Question 10

How to reduce chances of buffering

Answer 10

The tc or computer needs to decompress the data as it is playing the video
Before the video starts, it will buffer a sufficient amount to allow for the network occasionally being slow
The website or server may send low quality files if the connection is slow