Hello, I want to measure color of some objects underwater. I believe that one way of do that would be using the RGB system on photos. The other way would be measuring absorbance directly with an spectrometer, but I don't know how I can standardize my conditions. I have to measure the color of these objects but I can't move then to a place with controlled conditions. Can you guys give me some help in how can I do these measuring (with photos and spectrometer)?