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iso 12232

  1. Doug Kerr

    Another ISO 12232 metric of digital camera sensitivity

    ISO 12232:2019, Amendment 1:2020 added a new metric of digital camera sensitivity, the encoding-relative sensitivity (ERS). This is defined in terms of the photometric exposure required to produce a digital output signal of the value that is said to be equivalent to L*=50 (presumably referring...
  2. Doug Kerr

    On the infamous "18% average scene reflectance" and various ISO standards

    ISO standard 12232-2006 defines various measures of the sensitivity of a digital camera's imaging system. One important measure is the ISO saturation-based speed, Ssat, which ISO 12232 defines thus: Ssat=78/Hsat where Hsat is the saturation phtometric exposure of the imaging system. Shortly...
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