In article , Eric Stevens wrote:

But, alas, no extended range here (or with the poorer version of
curves) so no way - as far as I can make out - to actually access
all that glorious image data from within Lightroom.

Anyone knows if I've missed something?

Before I comment, I would like to try another approach. Can you post
a copy of the original in an editable form?

Certainly.

http://sandman.net/files/DSC01476.ARW


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