Duplicate your footage layer. Put a white solid between the two. Use the top copy of your footage as an inverted luma track matte. Then try using levels, curves, Threshold, exposure or a combination of all of these to refine the mat.
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Duplicate your footage layer. Put a white solid between the two. Use the top copy of your footage as an inverted luma track matte. Then try using levels, curves, Threshold, exposure or a combination of all of these to refine the mat.