Statistics for area not identified

Hi Guys,

I'm trying to gather some numbers for the area outside of those identified, essentially the background region. I've seen CorrectIlluminationCalculate but couldn't figure out how to have it analyze the image rather than try to do work. 
Is there an easy way to have the same kind of measurements done by MeasureImageIntensity but on areas outside those found by IdentPrimary etc?

    -Joshua

Got it.

Pipeline as follows, 

LoadImages > IdentifyPrimary > Mask > MeasureImageIntensity > (SaveImages) > Export