convert image to grayscale and scale it down. exploit numpy's slice assignment
convert image to grayscale and scale it down. exploit numpy's slice assignment

todo: find out how to pass an array of slices to numpy so we can have it do the i and j loops for us.

mcedit/pymclevel,mcedit/pymclevel,arruda/pymclevel,codewarrior0/pymclevel,codewarrior0/pymclevel,arruda/pymclevel,ahh2131/mchisel,ahh2131/mchisel