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Previsual symptom

A vegetation anomaly that is recognisable on IR film before it is visible to the naked eye or on normal colour photographs. It results when stressed vegetation loses its ability to reflect photographic IR energy and its recognisable on IR colour film by a decrease in brightness of the red hues.

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A vegetation anomaly that is recognizable on IR film before it is visible to the naked eye or on normal color photographs. It results when stressed vegetation loses its ability ...

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