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The "problem" is because saved tiff picture has 16 bits, and original has only 12.
That means the saved tiff image appear darker by factor of 2^4=14x.
Just adjust curves in any photo editing software that recognises tiff format from DSS and all is OK. Do not adjust them in DSS (while this is possible, it will destroy the original data in the stacked image which is still linear.
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