About still formats, why not use PNG? It does
hold some restrictions,
depending on your building method
(
http://www.libpng.org/pub/png/pngfaq.html#patents), but it should be
pretty much safe if we can arrange automatically converting whatever
format the user uploads to the "proper" (i.e. free) PNG format.
PNG is unsuitable for continuous-tone graphics.
By "unsuitable" I mean its compression isn't much better than BMP.
Timwi
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