How to select (all black) image outline using script

hi all,
we have thousands of clipart images to convert from wmf to png. We need to apply some processing to each image. We do this by selecting the black outline with contiguous off so it selects all the black. We then inverse the selection and apply processing to the remaining color parts of the image, leaving the black untouched. We can easily automate all of the steps excluding the first black outline selection.
anybody have any idea how we can do this?
alternatively should we do this in illustrator when we do the conversion from wmf to png and create layers there?
thanks.

Thanks Michael, we're trying this now.
Yes images are very similar in the fact that the have a complex hand drawn pure black outline with gradient colour inside.
This gradient being a WMF is only linited to 16 steps, so the banding occurs. This is especially noticable when enlarged.
so the purpose of the surface blur processing is to smooth this banding in the output png image, but keep the black outline sharp and crisp.
Below is a sample of one of the images done manually. now only 5999 to go
original wmf: https://dl.dropbox.com/u/40046102/Aardvark%20v2.wmf
Imported PNG from WMF through Illustrator, note the colour banding in the blue fill:
when smoothed in photoshop:

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