2.3 Compression Flashcards
1
Q
Compression
A
Representing audio, images, and especially video take up a lot of secondary storage space. Compression helps to reduce the size of these files so that we can store more data.
2
Q
Lossy compression
A
An algorithm is applied to remove unnecessary detail from the original file.
Some data is permanently lost, but enough remains so that the file is still useful and there is barely a noticeable difference.
Lossy compression results in dramatic file size reduction.
3
Q
Lossless compression
A
None of the original data is lost.
An algorithm can be used to perfectly restore the original file when needed.
This is especially useful for executable files, where all of the data is necessary.
Lossless compression causes file size to reduce moderately.
