$ mkdir sky_tiles
$ convert sky.jpg -crop 32X32 \
-set filename:tile "%[fx:page.x/32]_%[fx:page.y/32]" \
+repage +adjoin "sky_tiles/sky_tile_%[filename:tile].jpg"
An HTML5 game using Phaser (WIP)
$ mkdir sky_tiles
$ convert sky.jpg -crop 32X32 \
-set filename:tile "%[fx:page.x/32]_%[fx:page.y/32]" \
+repage +adjoin "sky_tiles/sky_tile_%[filename:tile].jpg"