I am following Ned Horning's note Calibrating RAW Images.
I have RAW images from a Foxeer Legend 1 camera with the IR blocking filter removed and replaced with a red filter.
This camera has the same processor as Xiaomi Yi and can be made to produce RAW images.
Using RAWNDng I have converted the RAW images to a DNG file format that ImageJ can read and used the Debayer plugin to generate R,G & B layers.
How do I generate an NDVI colour image ?