I stumbled across a very effective technique tonight.  But first a little background.  The image I was working on was a 4 photo HDR shot.  I processed each of the four first in DXO, then LR and finally Photomatix.  The first pass resulted in a sky that was very strange.  The word that best describes it is ‘posterization.’  No other area of the image had this problem, just the sky.  Where it transitioned from a darker blue to a lighter hue the transition was splotchy and pixelated. 

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