go to this url and download the program, rest assured it is virus free but you can scan if you want.
http://solar.4mg.com/GraalLevelGen.zip
to use just change the text boxes to what the labels on the side say they are (haven't played around with it much but I'll try and post more specific directions later)
Map image is the name of the map that will be output
Output folder is where the map will be put
Files start with is pretty self explanitory. Enjoy
btw you still need to make the bigmap.txt, this program doesn't make one (as far as I know)
[Disclaimer]
I am not held responsible for what you do with this program or if it causes harm to your computer. I did not produce it but am merely distributing it. This program has not been tested usign the latest graal version so be warned.