I am analyzing a data set of frogs photographed at night with flash. Using the 3% and 19% gray standards from at DKC-Pro White Balance & Color Calibration Chart that was photographed after each picture in the same location to make mspec files. My problem is this: No matter whether the ROI is a green frog, a brown frog, bright green duckweed, dark green algae, brown wet log or gray dry tree bark – the R values are always greater than the G values than the B values (R>G>B). I feel something has to be wrong here, but I can’t figure out what it is. Any suggestions?
The one thing that would come to mind is that the ‘white standard’ that you are using is not as white as you think, i.e. it has a lower reflectance at longer wavelength than what you are telling the toolbox.
Cheers,
Cedric