ICT UNIT 3 GRADE 8

When the result is too big to fit in the available digits

8 bits; can represent 256 numbers; overflow when number > 255

4 bits; can represent 16 numbers; overflow when number > 15

Remove unnecesary bits.

Impossible to get back the original file once compressed.

Reduce quality.

Find pattern and group them together in indexes.

Possible to get back the original file after compressed => no data lost.

Used where every data is important.

base 10; made up of 1 -> 9

base 2; made up of 1s and 0s

2^10 bytes

2^20 bytes

2^30 bytes