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Long exposures are taken with shutter speeds generally longer or much longer than one second, in order to capture stationary objects in low light while blurring or obscuring moving elements.

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If the trees are a grayish tone, it could even be the reflection of the red house roof on the trees. Given a long time exposure the reflection could have been absorbed for a right tint on them.
answered Dec 17 '13 by fernando.reyes