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Take some separate shots of the trapezium area at lower exposure rates, so it's not blown out. Open this image in Photoshop, create a new layer, copy the main image (blown) to the 2nd layer. Then layer mask and paint in the correctly exposed trapezium sections. I'm not sure on what sort of feathering might be needed to joing the 2 images together.
Dave
PS I haven't actually done this myself (yet) - but I have read about the basic principles in several websites/books, etc to get the general gist. I'm sure others on IIS will be able to be more precise in their suggestions/help.
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