1.2.4 compression Flashcards
1
Q
what is data compression
A
the reduction in the number of bits needed to represent data
2
Q
why is compressing data useful
A
can save storage capacity,
speed up file transfer,
decrease costs for storage hardware and network bandwidth.
3
Q
what is lossy compression
A
Removes data from a file which cannot be restored. This lowers the quality.
4
Q
what is lossless compression
A
It reduces the file size by not storing repeated detail. it can be restored
5
Q
advantages of lossy
A
lowers the file size a lot
6
Q
lossy based file types
A
jpeg
mp3
mp4
7
Q
disadvantages of lossy
A
makes the quality worse and cant be reverted back to the original
cant be used in text based software
8
Q
advantages of lossless
A
quality is still intact
9
Q
disadvantages of lossless
A
only a slight data reduction
