I don’t recall where I found the link to Dave’s site, but this image jumped out at me. After I dried myself off, I axed him about the colors, and here’s his response:
“Thank you for the feedback! It is funny that you see amazing color where I see too much green and blue! I don’t think the turtle was fluorescent; and while I don’t recall it being quite as bright greenly splotched, the camera often sees things differently than we do underwater, particularly when a flash is used. This is because water “absorbs” the colors of sunlight, the deeper you go, and thus things do not look as colorful in natural light to the diver. However, if you are close enough to use a flash, the white light from the flash “adds back” the color that has been filtered away from the sunshine.”
Adjust your nitrogen level, Dave. It’s a great photo. Just don’t lecture me about ugly dogs, okay?
[More amazing underwater photos of underwater things can be found at One Diver’s Perspective.]