<Dl> <Dd> C o m p r e s s i o n R a t i o = U n c o m p r e s s e d S i z e C o m p r e s s e d S i z e (\ displaystyle (\ rm (Compression \; Ratio)) = (\ frac (\ rm (Uncompressed \; Size)) (\ rm (Compressed \; Size)))) </Dd> </Dl> <Dd> C o m p r e s s i o n R a t i o = U n c o m p r e s s e d S i z e C o m p r e s s e d S i z e (\ displaystyle (\ rm (Compression \; Ratio)) = (\ frac (\ rm (Uncompressed \; Size)) (\ rm (Compressed \; Size)))) </Dd> <P> Thus a representation that compresses a 10 MB file to 2 MB has a compression ratio of 10 / 2 = 5, often notated as an explicit ratio, 5: 1 (read "five" to "one"), or as an implicit ratio, 5 / 1 . Note that this formulation applies equally for compression, where the uncompressed size is that of the original; and for decompression, where the uncompressed size is that of the reproduction . </P> <P> Sometimes the space savings is given instead, which is defined as the reduction in size relative to the uncompressed size: </P>

What are the measures of performance of data compression algorithm