Predict CIE XYZ tristimulus values from Vis-NIR reflectance spectra

Numerically integrates user reflectance against the CIE 1931 2-degree Standard Observer color-matching functions, weighted by the D65 illuminant. Returns the tristimulus values \(X, Y, Z\) on the standard scale where \(Y = 100\) for a perfect diffuse white.

Usage

predict_xyz_from_spectra(spectra, wavelengths)

Arguments

spectra

Reflectance values, in 0..1 or 0..100. A numeric vector (one sample), a numeric matrix (rows = samples, cols = wavelengths) or a data.frame.

wavelengths

Numeric vector of the wavelengths (in nm) corresponding to the columns of spectra. Must cover at least 400-700 nm; values outside 380-780 are ignored.

Value

A data.frame with columns X, Y, Z, one row per sample.

See also

predict_lab_from_spectra, predict_munsell_from_spectra.