I touched on this in another reply: http://news.ycombinator.com/item?id=4532495 http://news.ycombinator.com/item?id=4532495, with the short answer being unusabl

I touched on this in another reply: http://news.ycombinator.com/item?id=4532495 http://news.ycombinator.com/item?id=4532495, with the short answer being unusably high memory usage. From memory PNG doesn't compress as well as you may intuitively think in this scenario, with the resulting files being around 3X the size.