Three-range method

The three-range method is a standardized method for colour measurement that is used in colour science, quality assurance and production technology. It is based on the idea of reproducing the human eye's perception of color using three color components (red, green and blue). These three basic colors correspond to the sensitivity ranges of the human color receptors (cones) and enable a precise description and reproduction of colors.

As part of the process, the light of a sample is broken down into three spectral ranges by filters or sensors. The intensities of these areas are measured and expressed as tristimulus values (X, Y, Z). These values can be converted into different color systems, such as the CIE-Lab color system, in order to precisely define colors and analyze differences between hues.

The three-range method is particularly useful for industrial applications where color accuracy is critical, such as in the textile, printing, paint and plastics industries. It enables the objective evaluation of colors, independent of subjective perceptions, and assists in the development, monitoring and standardization of colour formulations.