D65 (Standard Illuminant)

D65 is a standard reference light source used in color science and photography that simulates average midday daylight, including natural sunlight and overcast conditions. It provides a consistent basis for comparing colors under daylight-like illumination. D65 has a specific spectral distribution, meaning it emits light across a range of wavelengths in a way that closely resembles natural daylight at noon. This standard helps ensure that colors appear consistent and accurate across different devices, viewing conditions, and applications such as printing, digital imaging, and color matching.