googletilecutter - Google Code

Code License:	GNU General Public License v3
Labels:	maps, unix, bash, command-line

Blogs:	Googletilecutter

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Project owners:
	iancstevens

This image tiler uses Free Software, is released under the GPL, and has the following features:

Tiles most image formats, including GIF, JPEG, PNG and TIFF.
Works on most flavours of Unix, including Mac OS X.
Supports version 1 and version 2 zoom levels.
Automatically calculates offsets for all zoom levels.
Supports padding from the upper-left as output by the web-based tiling helper.
Automatically pads image to size appropriate to Google Maps (ie. multiple of 256).
Optionally discards empty transparent tiles to save space.
Optional prefix for each tile.
Outputs tiles in PNG format.
Compresses tiles with either advpng or pngcrush.

The tiler requires ImageMagick and advpng or pngcrush for PNG compression. (I recommend advpng as it is faster and compresses smaller in most situations.) Tiled image size is restricted only by disk space and ImageMagick limitations.