[OSM-dev] Cutting up an image into tiles

[Robert Hart]

> So can anyone point me in the direction of some guidelines about
> scripting ImageMagick / Rmagick , or something the cut the image up -
> which shouldnt be too hard to do?   I dont have access to the TIFF
> right at the moment, but its big.  Over 80mb I think.

For not *huge* images, I have used bash script + ImageMagick...

Something like:

for x in `seq -w 00 32` ; do 
  for y in `seq -w 00 32` ; do 
    convert -crop 100x100+$(($x*100))+$(($y*100) bigfile
tile-${x}-${y}.png
  done
done

but that is inefficient as it's rereading the source image for every
output tile.




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