Your last two posts seem to be about one image.  I assume you have more 
than one to combine via hugin.

So when I asked about the different exposures across the multiple original 
images, I think that was important.  I don't see any answer.

I'm still guessing that hugin is adjusting the exposures to eliminate that 
differences in original exposure across the images, and that is where the 
highlights are lost, meaning 4 bits added (to the original 12) are not 
enough to bridge the exposure differences.

You seem to have already figured out that a different conversion from raw 
to tiff would result in protecting those highlights from subsequent 
destruction.

I know far less about Rawtherapee than you know.  So my terminology is 
likely wrong.  But logically, a less linear mapping in the original 
conversion from 12 bits to 16 bits would provide the extra room to protect 
the highlights from the subsequent  adjustment (that normalizes exposure 
between photos).



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