Light that is emitted by the subject in an invisible form of energy such as heat. Absorption cannot be photographed, making subjects that are highly light absorbing very difficult to photograph. Black objects are highly absorbing, making it difficult to capture associated textures such as fur or velvet. Most subjects absorb part of the light that strikes them. The degree to which they absorb light causes the distinctions in color among the shades of gray between pure white and black.

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