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Hi,
As Bojan says, all the data is still there it is just 'hidden' in a fraction of the tiff 16 bit range. If you look at the histogram it will have a very thin base less than one tenth of the width, with complete emptiness to the left and right.
By using curves and levels you can stretch this data to occupy more of the range. By widening this histogram in an appropriate manner you can tease out all the hidden details.
Also as Bojan says, dont play around with DSS to adjust the data as basically it just destroys it. Save the image without applying the DSS default adjustments and play around in photoshop.
As I said before, Ezystyles has uploaded a howto which explains this.
Paul
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