Ok, I got a better result now, as follows :
1) crop
2) downscale to 1600 x 1200, using cubic filtering
3) apply a bit of unsharp mask
4) downscale to 800 x 600, using cubic filtering
5) apply a little bit of unsharp mask
This seems to work better than a straight rescale to 800 x 600.
If you have a better method, please share it.
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