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Signed Distance Field textures

Hello, i have been trying to find out how i can create a signed distance field texture from a png alpha map, but i cant figure out how to do it. If anyone knows how to do it either photoshop or another program it would be appreciated. Ive added some photos to show what i mean.

http://horde3d.org/wiki/index.php5?title=Preprocessing_Technique_-_Distance_Field_Vector_Textures