That is correct, you need to have the black on white (or vice versa) to get the correct blur.
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I am Vince and this is my personal website. I am a computer programmer working in local search with TrueLocal. At home I use a mac but I live and breath .Net at work. The name filbar is an adaption of the acronym fubar (Fucked Up Beyond All Recognition). I did something exceptionally odd one day and my friend Clayton said, "that's filbar!" Somehow the name stuck and, mother of all surprises, the domain was available.
That is correct, you need to have the black on white (or vice versa) to get the correct blur.