jpeg compression works better on photos, gif compression works better for horizontal lines of repeating color One of the easiest things to compress is repetiti

jpeg compression works better on photos, gif compression works better for horizontal lines of repeating color One of the easiest things to compress is repetition. After that local effects are going to be easiest Remote effects -- i.e. assignment, is going to be np complete -- i.e. if the best compression for x depends on everything else, then zip is going to have to look at everything else for every single bit it compresses!! So I don't know the details of zip's compression, but I'm sure it doesn't compress side-effects well