The stark blood-red color of the San Francisco Bay salt ponds needs no filter:
Details from the always outstanding Daily Overview:
A recent figure estimates that 80% of the San Francisco Bay wetlands area—approximately 16,500 acres—have been developed for salt mining. The ponds get their particular, vibrant colors from the micro-algae that live there and the species’ tolerance to salinity. Areas that have a bright red hue are caused by the algae Dunaliella, which thrives in water with extremely high salt content.
Amusing Planet has a great collection of more aerial photos of the salt ponds.
(See all Orbital Views here)