In MaximDL, you access the DDP features via the Filter | Digital Development menu item. Auto check the background and mid-level to start then uncheck them. MaximDL will analyse the image and determine the appropriate values. Normally these are quite aggressive so you'll want to tweak accordingly. For the background level, what ever it determines, subtract around 100 to 200 ADU counts from the value to avoid any black clipping. Adjust the mid level based on the how you wish to display the image. My recommendation is to not be too aggressive with the mid-level just stretch the data to fill out the bit space, then bring it into photoshop. Give it a whirl!
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