Evidently there is a limitation with the new iPad (nee iPad 3), which can cause JPEG images to be resampled, when viewed through Webkit (mainly Mobile Safari, but other applications can use Webkit).
These have to be huge images though…. Â For example, 2000×1000…. So these aren’t your normal run of the mill images… Â Progressive Scan JPegs, and PNG’s don’t seem to be vulnerable to this. Â Just Classic Jpegs…
Take a closer look over at Duncan Davidson’s blog for more information….