isnt the entropy the maximum compression data can be compressed to? if so.. why do 5 algos when u can do 1Arithmetic coding is the only entropy coder which achieves the entropy, that's why it's widely used, it's only back draw is speed, though.

also, do you know where i can find any examples of arithmetic coding.. i went to the site you gave me, the explanation is good... but i need a working implementation to test it out and see if its what i should impelement.. in the mean time, ill try and implement it using the explanation