Spectral Data is a physical measurement conducted by a Spectrophotometer. The instrument measures the intensity of light reflected from an object's surface at small, precise intervals (nanometers) across the entire visible light spectrum (400-700 nm). This process results in a comprehensive curve that represents the unique light absorption and reflection properties of that specific color.

It is referred to as the "DNA of color" because this curve is an absolute and unique fingerprint of the color's identity. Unlike color models like CMYK or L*a*b*, which are derived from this data, the spectral curve is independent of viewing conditions or the specific output device. This makes it the most reliable scientific foundation for precise color matching and the creation of accurate ICC Profiles.