Pointless? The point is you wouldn't need to use PNG. Could keep your BMP or whatever and still gain the filesize. (I don't need such a feature, I'm just pointing it out).
I'm not saying that the png format should be replaced by jpegs, what would happen to pixel art. I'm just pointing out that pngs can weigh two - three times more than jpegs of reasonable quality.
Also, when I say zip, I mean all formats. Rar, 7z, Ace, etc.
have you tried it or you just write to write and to argue? as I said, png is already compressed. try to zip a zip and see how much will you gain.
EDIT: I should also note I think PNG is obviously the best method, I just can see why someone might want an alternative.
:sigh: how many times have I explained why and you still can't see the point? ok, so now at the time I'm writing this I have a 1024x768 game with a frame with a 1024x768 photo in background. It's 340kB in PNG format in runtime. The thing is, that the same photo in jpeg format is 87kB. Imagine someone doing Curse of Enchantia (could not think of any other adventure game) clone with beautiful backgrounds... jpeg can be almost not lossy compression and still weigh less than PNG. Thats my point and I beg you don't tell me that PNG is the best method. It's not. The best method is to have a choice