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Good question Al, i'm not sure of the exact reason why - but there is a definite difference.
I went back to the original RAW file of the tractor, and without any adjustments, converted it to TIF and opened it in PS.
Using shadow/highlight, I couldn't recover ANY of the sky detail - because it was clipped - the pixel values showed 255/255/255. There was nothing to recover.
It showed pure white in Raw Shooter Premium as well, but once I reduced the exposure value in RSP, the detail came out (see attachment).
I think it's because once it's converted to TIF, if it was white in RSP, then it's white in the TIF (clipped).
If I opened the RAW in Photoshop, and adjusted it there, I could probably recover the data in the same way.
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