Baughn: I think Deon means switching to a different tileset when zooming out and switching back when zooming in,
so we can use icons instead of downscaled graphics when zoomed far out. Like making a 3x3 workshop to a little symbol or something.
Zooming in seems to be covered if you downscale the "fully zoomed in" 64x64/whatever tileset like you said, but switching the tileset here can do some good, too.
We could use "iconized" chests and so on in default view and when we zoom in, we see a super-detailed view like in the mockup I posted (source: unknown by the way).
I doubt every 64x64 tile for maximum zoom level looks good downsized when zoomed out - not because lanczos is bad, but because it is too "natural" and so too indistinguishable from afar. It all becomes a blend of earth colors.
Example: Gems in a rough wall. They would have to be really HUGE and unnatural on the 64x64 tile, so that we see them at all on 16x16.
Example 2: Mason's workshop. default zoom level: like we have it now a bit "iconized", zoomed in: super-detailed, realistic, zoomed out: an icon
http://img683.imageshack.us/img683/7305/newcanvasiz.jpgBut you have most of it already in your code, so: HOORAY!