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Thanks Lindon and Steve !
Photometry is code I've written with .NET.
I first plate solve using Astrometry. Then I count the total camera ADU for each of the brighter stars (net of local background). Then I fit these observed ADU counts to reference star VMags from APASS.
Once you get the formula for VMag as a function of net ADU, you can transform the net ADU at each pixel to an equivalent VMag per pixel. Since you know the image arcsec/px scale, you can then adjust to VMag/arcsec^2.
Final step is a colour mapping, I use Dave Green's cubehelix colour scheme.
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