värinmukaisuusfunktion

Värinmukaisuusfunktio, often translated as color matching function or tristimulus values, is a fundamental concept in colorimetry. It describes the response of the human visual system to different wavelengths of light. Specifically, it quantifies how much of each of the three primary colors (red, green, and blue) is needed to match a monochromatic light of a given wavelength.

These functions are based on experiments where observers were asked to adjust the intensity of three colored lights until they perfectly matched a sample light. The results of these experiments are typically represented by three curves, often denoted as x(λ), y(λ), and z(λ), where λ represents the wavelength of light. These curves are known as the CIE (International Commission on Illumination) color matching functions.

The x, y, and z values are additive. This means that if you mix lights with different wavelengths, their corresponding x, y, and z values can be added together to determine the tristimulus values of the resulting mixture. This property makes color matching functions essential for defining and calculating color spaces, as well as for understanding how colors are perceived and reproduced. They form the basis for most color measurement and communication standards.