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Photographs

Photographs using Plant Stress Detection Filters
white pine needles in visible light
white pine needes using the plant stress detection filter. Some lighter (unhealthy) needles are circled

Photographs of white pine needles, one using visible light, the second using the plant stress detection filter. Notice how the brown needles in the left photograph are more noticeable using the purple filter.

See the examples of using the purple filter with a digital camera that Deb Olstein took in an urban wetland.