List of Index formulas and their values
Remember to fully parenthisize your expressions!!!!!

This is because r/g+b is interpreted as
	r/(g+b)
where as (r/g)+b is interpreted correctly

BEGIN Formulas
     Name=Flat Field Correction
          Formula=(128/a)*b
     Name=Increase Contrast
          Formula=((a-128)*2)+128
     Name=Decrease Contrast
	  Formula=((a-128)*.5)+128
     Name=Brighten
	  Formula=A+40
     Name=Darken
	  Formula=A-40
     Name=Increase Contrast
	  Formula=(A*2)-128
     Name=Decrease Contrast
	  Formula=(A*.5)+128
     Name=Average
	  Formula=(r+g+b)/3
     Name=Negate
	  Formula=(A - 255)
     Name=Normal Veg Index
	  Formula=(((r-g)/(r+g))+1)*128
END Formulas