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Dynamic Range is the point where the signal-to-noise ratio (SNR) drops to 1.0. This is the point where the signal is equal to the noise.
The high endpoint for Engineering Dynamic Range is the point where the SNR drops to 0.1. This is the point where the noise is 10x the signal.
The low endpoint for Photographic Dynamic Range is the point where the SNR drops to 0.5. This is the point where the noise is equal to the signal.
The high endpoint for Photographic Dynamic Range is the point where the SNR drops to 0.1. This is the point where the noise is 10x the signal.