bremnet says... Not sure that I'd call it trivial, but from what one can gather, using the panel of known colors as a calibrant for correction during processing does seem like an obvious approach. I'm assuming that the newsworthiness of this is in the trick or complexity of the post-processing - removing scatter, haze, correcting the full color spectrum with multiple calibration points - it won't be a simple linear correction. I ain't no expert, but have spent oodles of time trying to color correct videos and stills from our scuba trips, and the *automatic* color correction in current software is still pretty poor IMO, relying often on a single color as the calibrant (so, a "pure" white region in the photo, a "pure" black region in the photo etc.). Manual adjustment of the photo color balance for UW vids and photos is on my list of "What Hell must be like". kir_mokum said: i'm sure i'm missing something but this seems like a trivial thing to do.