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Warts: noise

Whereas blowout is the limitation on overexposure, noise is the limitation on underexposure

Noise in digital images arises from thermal energy and cannot be reduced below a theoretical minimum discovered by the 19th century physicist Ludwig Boltzmann

Example shows effect of raising shadow area with resulting amplification of noise

A similar effect occurs when using high ISO




Pluses and Minuses of Digital SLRs            © Robert Harrington 2004