Memory & Storage (image, sound & compression)

James is a graphic designer. He has created an icon set of 20 icons for a project. The icons are uncompressed images of 96x96 pixels in 8-bit colour. Explain how the approximate file size can be calculated for the icon set.

• 96x96

• 96x96 * 8

• 96*96 * 8*20

• 96*96 * 8*20*10%

State how many different colours can be stored using 6-bit colour.

• 32

• 64

• 255

• 128

MP4 compression is used to store the video clip on the hard disk of the server. State what is meant by the term “compression”. (select all that apply)

• makes "stuff" smaller

• makes "things" smaller

• Reduces the number of bits

• makes the file size smaller

Describe two advantages of the streaming service using compression.

• The video clip will transfer to the user more quickly

• The video clip will transfer to the user more slowly

• Requires less storage capacity

• Requires more storage capacity

State one potential disadvantage to using compression.

• The resolution of the video will be affected.

• The file size may be increased

• The quality of the video may be reduced.

• The video will not be affected.

This type of compression will cause no loss in quality.

This type of compression will cause a loss in quality.

State what is meant by the term, “sampling rate”.

• The volume of the recording

• The wave length of the audio file

• the finished mp4 file

• Number of samples taken/stored per second.

increasing the sampling rate will... (select 2 answers)

• make the file size larger

• improve the sound quality

• decrease the sound quality

• make the file size smaller

The number of bits used to store each sample is know as the what...

• binary code

• sample rate

• bit depth

• amplitude