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Rick Hull
this may be information for all, or well known by many, but I have been unable to uncover this,
so I am hoping the experts here can enlighten me.....
although NEF is called RAW by Nikon, I suspect there is some level of processing going on?
my biggest concern is that the Bayer array, and the pixel values associated with each, and hence with that individual color, is NOT maintained in the NEF file? This is how data would be represented in a FITS file, and how I get my data from an SBIG CCD camera. If it were a true RAW, I think it would be easy to find a NEF to FITS converter / translator, but have not been successful.
I suspect that NEF is more a highly compressed, perhaps lossless true, but compressed file format;
whereby all pixels have been resampled and assigned an interpolated RGB color value per pixel ?
Since the algorithm is unknown, and even if so, can it be undone, this resampling already creates a loss of fidelity when one goes to register and stack several sub-frames, let alone the loss of corrective efficiency one would hope to achieve by dark frame subtraction.
Am I correct in these suspicions? Or am I missing some understanding? Please help.
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