This shot highlights a patch of green algae caught in a small spot of sunlight on the edge of a waterfall in Holland Creek Ladysmith BC Canada

Canon EOS 20D Tamron SP AF 17-35mm f/2.8-4 Di LD IF
1/2s f/32.0 at 35.0mm iso100

Camera set to RAW, picture style – Neutral
colour space – Adobe RGB
Aperture Priority, no EC, no MLU
on a Manfrotto #055 tripod