Wood effect
The Wood effect is a phenomenon in infrared photography . It is named after its discoverer Robert Williams Wood , an American physicist (first description 1919).
Leaf green appears bright white in the near infrared, because chlorophyll is transparent in the infrared range and the light is reflected by the water contained in the plant. To a small extent, the effect is also related to the fluorescence of chlorophyll, which strongly absorbs short-wave light and emits it again in the infrared with a shift in wavelength .
The infrared transparency on which the effect is based is vital for plants, as excessive absorption of infrared radiation from the sun would lead to heat death.
Individual proof
- ↑ Prof. Robin Williams and Gigi Williams: Prof Robert Williams Wood (1868-1955). Pioneers of invisible radiation photography. map.rmit.edu.au ( Medical and Scientific Photography ), archived from the original on March 10, 2018 ; accessed on March 10, 2018 .