Please add support for Nikon Dust Off (NDF) images
Nikon offers a feature to automatically remove spots caused by dust on the lowpass filter using a so called Nikon Dust Off image (NDF). See https://support.nikonusa.com/app/answers/detail/a_id/7324/~/how-does-image-dust-off-work%3F for details.
Dcraw has a tool to process these images: http://www.cybercom.net/~dcoffin/dcraw/ (direct link to source: http://www.cybercom.net/~dcoffin/dcraw/read_ndf.c). I'll attach a copy of the current code.
According to the site the code is free to be reused if proper attribution is provided.
Thanks in advance.