Is there an easy way to download a bunch of web map tiles (in /z/x/y.png format) and stitch them together into a single large image? I could probably script this using ImageMagick, but would prefer not to invent another wheel.
(The tiles in question are made by me in TileMill. I'm having serious problems with TileMill's export feature, and thought this might be a workaround.)
Mac or Linux only.