ISO 12232:2019
Photography — Digital still cameras — Determination of exposure index, ISO speed ratings, standard output sensitivity, and recommended exposure index
This document specifies the method for assigning and reporting ISO speed ratings, ISO speed latitude ratings, standard output sensitivity values, and recommended exposure index values, for digital still cameras. It is applicable to both monochrome and colour digital still cameras.
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Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Exposure index
4.1 General
4.2 Focal plane measurement
4.3 Estimating focal plane exposure from scene luminance
5 Test conditions
5.1 General
5.2 Illumination
5.2.1 Daylight reference illuminant
5.2.2 Tungsten reference illuminant
5.3 Temperature and relative humidity
5.4 White balance
5.5 Infrared (IR) blocking filter
5.6 Photosite integration time
5.7 Compression
5.8 Other DSC user settings
6 Determination of ISO speed and ISO speed latitude
6.1 General
6.2 Saturation-based calculations
6.2.1 Focal plane measurement
6.2.2 Scene luminance measurement
6.3 Noise-based calculations
6.3.1 Focal plane method
6.3.2 Scene luminance method
6.3.3 Colour cameras
6.3.4 Quantization effects
6.4 Method of reporting
7 Determination of standard output sensitivity (SOS)
7.1 Method for calculating SOS
7.2 Method of reporting
8 Specification of recommended exposure index (REI)
8.1 General
8.2 Method for calculating recommended exposure index
8.3 Method of reporting
Annex A (informative) Recommended procedure for determining the noise-based ISO speed
Annex B (informative) Scene luminance and focal plane exposure
Annex C (informative) Recommended procedure for determining SOS values
Annex D (normative) Removing low frequency variations from the image data
Bibliography
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Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Exposure index
4.1 General
4.2 Focal plane measurement
4.3 Estimating focal plane exposure from scene luminance
5 Test conditions
5.1 General
5.2 Illumination
5.2.1 Daylight reference illuminant
5.2.2 Tungsten reference illuminant
5.3 Temperature and relative humidity
5.4 White balance
5.5 Infrared (IR) blocking filter
5.6 Photosite integration time
5.7 Compression
5.8 Other DSC user settings
6 Determination of ISO speed and ISO speed latitude
6.1 General
6.2 Saturation-based calculations
6.2.1 Focal plane measurement
6.2.2 Scene luminance measurement
6.3 Noise-based calculations
6.3.1 Focal plane method
6.3.2 Scene luminance method
6.3.3 Colour cameras
6.3.4 Quantization effects
6.4 Method of reporting
7 Determination of standard output sensitivity (SOS)
7.1 Method for calculating SOS
7.2 Method of reporting
8 Specification of recommended exposure index (REI)
8.1 General
8.2 Method for calculating recommended exposure index
8.3 Method of reporting
Annex A (informative) Recommended procedure for determining the noise-based ISO speed
Annex B (informative) Scene luminance and focal plane exposure
Annex C (informative) Recommended procedure for determining SOS values
Annex D (normative) Removing low frequency variations from the image data
Bibliography