data compression

Cards (11)

disadvantages of a large file size?
-takes up more storage on our devices(having to buy more storage is bad for the environment and expensive)
-takes more bandwidth to send
-uses up more mobile data
what is lossy compression?
reduces size of file,by permanently deleting data
file that are compressed will be lower quality
advantages of lossy compression?
very effective,can make as small as you want
disadvantages of lossy compression?
once the compression has been completed,you cannot return to the original file/quality
how can lossy compression be used in sound?
reducing sample rate
reducing sample resolution
file types of lossy compression
Jpeg
Mpeg
Mp3
what is lossless compression?
technique that reduces file size without losing any data.
advantages of lossless compression
lets you return to the original file size and quality
disadvantages of lossless compression
Not all files are suitable for lossless compression
when does data redundancy occur? 
when data is repeated unnecessarily
what type of compression is RLE?
lossless