Calculating the storage requirement of a file

Question 1

Pixels in a black and white image

Answer 1

1 bit per pixel

Question 2

Pixels in an 8-bit colour image

Answer 2

1 byte per pixel

Question 3

Characters in an ASCI text string

Answer 3

1 byte per character

Question 4

Sound in wave file

Answer 4

86 kilobytes per second

Question 5

Uncompressed frame of standard-definition TV

Answer 5

27 megabytes per frame

Question 6

Uncompressed frame of high-definition TV

Answer 6

182 megabytes per frame

Question 7

Compression

Answer 7

Can be used to reduce file storage requirements.

Question 8

Lossy compression

Answer 8

Data that is deemed as unnecessary is removed in the compression process. This data is removed permanently.

Question 9

Uses of lossy compression

Answer 9

Used for multimedia such as audio, video and image files. This is mostly done when streaming these files, as a file can be streamed more effectively.

Question 10

Music file-lossy compression

Answer 10

It will try to remove all background noise and noises that may not be heard by the human ear. This means that it will not sound exactly as it did, but it will be a very close representation.

Question 11

Lossless compression

Answer 11

Compression that loses no data in the process. The compressed data reverse and reconstruct the data file exactly as it was, when the file is opened.

Question 12

Music file-lossless compression

Answer 12

It will not lose any data from the file. This method would look for repeating patterns in the music. It would store this pattern once along with how many times it is repeated. This way repeating data is reduced.