Corrected conversion from transmittance to absorbance

I corrected the conversion from transmittance to absorbance from:

    A = 1 - T
that was being used to:

    A = -log10(T) = log10(1 / T)
based on these references:
http://en.wikipedia.org/wiki/Absorbance, or
http://books.google.com/books?id=BNqp0RO7DXcC&lpg=PP1&pg=PA27#v=onepage&q&f=false