Compress RA W files
Nikon RAW files (NEFs) come in two types (12-bit and 14-bit) and with three levels of compression (uncompressed, lossless compressed and compressed). On more basic Nikons you don’t get to choose, but on advanced models you can decide between smaller file sizes (12-bit compressed) and better quality larger ones (14-bit uncompressed).
Try RA W retouch
If you shoot RAW files it doesn’t matter what Picture Control you use, because you can use the Retouch menu to open the image up and choose a different one at any time. While you’re at it, you can change the photograph’s white balance setting too. The camera will then save a new, JPEG copy with those new adjustments applied.
70 Create your own Picture Controls
Picture Controls apply particular ‘looks’ to JPEG images processed in the camera (Nikon’s own software can replicate these looks from RAW files). You can create and customise your own Picture Controls in-camera, and there is also a desktop utility (Picture Control Utility) for creating new ones.
Bust that dust
All current Nikon D-SLRs have built-in dust removal systems, and if those don’t work you can always try manual cleaning… or you can try Nikon’s Dust-Off system and fix the problem with software. You take a reference photo (Setup menu) which can be used by Nikon software, including Capture NX-D, to blot out spots digitally.