On Sat, Feb 24, 2001 at 06:16:13PM +0100, egger@xxxxxxx wrote: > COW is indeed a good thing. However I assume you address the mentioned > memory overhead with your answer and I'm not sure how you would avoid > it with copy-on-write. You're completely right. It was a thinko on my part, I have been starting at assoc/ non-assoc alpha channels for too long and forgotten that the storage is inline and thus not amenable to COW. Sorry everyone. Nick.