Got my attention; spent two years at Kwajalein Atoll. Learned to dive because it was too easy to do; in the atoll visibility was usually >100 meters, but oceanside was truly spectacular.
All sorts of lenses in play here with the addition of water and glass, making colors and distortions that vex the capture. Here’s what I did in rawproc:
- _DSC2188.NEF:rawdata=crop - Now that I have librtprocess demosaics, I’m moving away from dcraw processing, instead starting with the raw data from the NEF.
- colorspace:camera,assign - rawproc now reads both dcraw and camconst.json, and it appears it got primaries for your D750 from dcraw.
- subtract:camera: Blackpoint subtraction based on the libraw-provided number
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demosaic:amaze - librtprocess, the ‘amazing’ work of @heckflosse
- blackwhitepoint:rgb,data - for some reason, black still wasn’t black after the subtract, and rawproc now has a blackwhitepoint option to scale to the actual data min/max (Edit: ah, went back and looked, turns out the whitebalance below was shifting the data off 0, probably what I get for putting white balance too far down the chain…)
- rotate:270.0 - The exif orientation was 1, but the image was laying on its side… ?? (Edit: Just inspected the NEF with exiftool, it’s orientation is tagged correctly. So, something wrong I’m doing in rawproc…)
- whitebalance:3.714,1.000,1.139 - I started with the camera numbers, but I used them to also take out the color cast, basically just scooching the numbers until the histogram peaks lined up.
- curve:rgb,3.0,0.0,19.0,13.0,33.0,39.1,255.0,255.0 - puts contrast into the data, which sits at the lower end of the display bounds.
- saturation:1.20 - Just to put a bit of pop back into the desaturated colors
- resize:0,1080,lanczos3 - For posting