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Simple tool to convert PNG files with a palette to 4 or 16 colour SNES
tiles.

Usage: snesgfx [-p palette_file] [-s] [-c colours] source.png dest.data

-p palette_file	Write a SNES palette based on the one in the image to the
		passed file.
-s size		Indicates either 8 (for 8x8 the default) or 16.
-c colours	Colours -- either 4 or 16.  Defaults to 4.
source.png	The source PNG file.  This is read left to right then top to
		bottom.
dest.data	Where to write the SNES tile data.