compression Flashcards
1
Q
what is compression?
A
reducing the number of bits in a file
2
Q
benefits of compression?
A
- makes storage capacity of file lower
- makes data transfer of file quicker
(more data stored on a storage device, transferred in a smaller amount of time)
3
Q
difference between lossy and lossless?
A
data lost = lossy (cannot be recovered)
data not lost = lossless (encoded differently)
4
Q
lossy compression reduces the …….. of the image/sound
A
quality
5
Q
what kind of files can lossy compression be used for vs lossless?
A
lossy - images, sound and video
lossless - all types of data
6
Q
where can lossy compression not be used and why?
A
documents and executable files (as if words gone in word doc = completely different)
7
Q
can lossy be returned to the original format?
A
no, only lossless can
