I also started to play with some enhancements on top of the patch we are
discussing here. Using a steep gaussian filter instead of the plain box
filter seems to be a good compromise. It's better at suppressing Moire
patterns, at the cost of introducing a little blur. I have not yet
finished this patch though and it has some issues. It works for the most
common cases though and if someone is interested, it can be downloaded
here: http://sven.gimp.org/misc/gimp-decimate-2.diff


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