0 Introduction
1 Scope
2 Normative references
3 Definitions
4 Requirements
4.1 Preparation of samples
4.2 Test equipment
4.2.1 Components of the measuring device
4.2.2 Equipment colour
4.2.3 Photometer
4.2.4 Illumination and viewing system
4.2.5 Equipment design and measurement methodology
4.2.6 Measurement spot size
4.2.7 Measurement area
4.2.8 Calibration
4.2.9 Measurement tolerance
4.3 Measurement process
4.3.1 Precautionary measures
4.3.2 Picture definition
4.3.3 Sample area
4.3.4 Number and location of measurements
4.4 Determination of contrast values
4.5 Requirement