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Term: Tone Transfer Function (TTF)

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Term: Tone Transfer Function (TTF)

Any generic functional relation that describes the way light levels (or encoded light levels) are numerically transformed. Examples of tone transfer functions are a film's characteristic curve that describes how radiant energy is transformed into different levels of film density. Similarly, a gamma function or OECF describes how scene reflectances are related to 8-bit digital count values.
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