poita said:

If they are using a homemade scanner then the most likely reason is that their light source is not spectrally matched to their sensor (camera).

I believe that they said they changed/improved their capture process, but at some point I remember they were using a point and shoot camera, I'm sure it has auto white balance and color correction on it. I know there's a huge difference in my dslr when I shoot raw vs jpg, the jpg has lots of adjustments pre-applied to it before I export from the camera.