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Peter, there are not many references online for the application of DDP. One of the best explanations I found was in the AIP4WIN book by Richard Berry and James Burnell. There are a few ways to apply DDP depending on what you want to achieve. Its easy to over do it and you'll find most tools set the mid point far too aggressive and requires manipulation to control the histogram curve. DDP is preferable over gamma or log stretches, though the latter works well. Like most tasks in a workflow there is risk you'll over do it - just keep an eye on the histogram after the DDP operation. MaximDL is notorious for black clipping so alter the background value by a few hundred counts to avoid this. You can always fix the black point in a tool that will give you greater control such as PS. If the DDP process is also doing sharpening, you may want to turn it off or at least keep a eye on the white point. Its not a replacement for levels and curves as many may believe. You'll still need to use the PS tools to finish off. If you're using DDP as a one stop operation, you'll find that you're pushing the data too hard, thats been my experience anyway. Its worth investigating further on some old data - experiment.
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