On 8/15/2011 10:33 AM, Warren Young wrote:
The hard edges in the original art are causing stair-stepping when doing
a direct downsample, though. (Look at the pointy bits.) By blurring
the high-res version and then downsampling by a non-integral amount, you
can get a much smoother result.
This is only the case if the "downsample" operation used by GIMP, when
d/s by an integral amount, is to simply pick every Nth pixel. That's
very fast -- but is not the correct operation (I'd posit a GIMP bug, in
fact).