Nikon HE* decoder

I spent the last month having a fun little science project. Even though not owning a Nikon camera at all, I tried if it’s possible to get a working decoder for the HE* bitstream with the help of Claude. When using samples from: https://photographylife.com/nikon-z9-sample-images-raws (all copyright belongs to the author) the decoder produces this: So you can see the colors are still off even when using WB coeffs from the EXIF and Color Matrix from Adobe. So the inverse MCT is still wrong. A ...