Slice and dice an image, turning it into many equal sized tiles. Useful for tools like leaflet.js, to create interactive "slippy" maps.
The image is sliced up into equal sized tiles, based on the command line
option --tile-size (default 256 pixels).
Once the tiling is finished, the original is resized to half its current dimensions (the orignal file on disk is not touched) and the process repeats. Each halving is a new "zoom level".
Each file is named something like:
tile-z-x-y.png
Where 'z' is the zoom level, x and y are the coordinates, with 0,0 being the top left tile.
slicerdicer --help
slicerdicer --filename foo.png --tile-size 256 --concurrency 5
In my tests on an 32641 x 16471, 8-bit/color RGB PNG, memory usage peaks at around 2.7GB.
On that same test image, the run takes around 63 seconds to create the 11179 tiles, on my fairly underwhelming MacBookPro12,1 (dual core i5).