colorimetry 0.0.9

Rust Spectral Colorimetry library with JavaScript/WASM interfaces
Documentation 
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// SPDX-License-Identifier: Apache-2.0 OR MIT
// Copyright (c) 2024-2025, Harbers Bik LLC

use nalgebra::{ArrayStorage, SMatrix};
use std::sync::LazyLock;

use crate::{
    colorant::Colorant,
    spectrum::{Spectrum, SPECTRUM_WAVELENGTH_RANGE},
};

/// Nummer of Test Color Sample Spectra
pub const N_TCS: usize = 14;

/// Create Array of Test Color Sample Spectra, as used to assess the color rendering performance of a light source.
///
/// The data for these is obtained from the <https:://cie.co.at> site's dataset library, on Sep 4, 2024.
/// The dataset uses a 360-830-5nm domain, included below in the 'TCS5' static matrix truncated to a domain from 380-780-5nm.
/// Here the dataset is converted to an array of 14 Spectra, using linear interpolation.
pub static TCS: LazyLock<[Colorant; N_TCS]> = LazyLock::new(|| {
    let s_vec: Vec<Colorant> = TCS5
        .column_iter()
        .map(|s| {
            Colorant(
                Spectrum::linear_interpolate(
                    &[
                        *SPECTRUM_WAVELENGTH_RANGE.start() as f64,
                        *SPECTRUM_WAVELENGTH_RANGE.end() as f64,
                    ],
                    s.as_slice(),
                )
                .unwrap(),
            )
        })
        .collect();
    s_vec.try_into().unwrap()
});

#[test]
fn tcs_test() {
    use crate::observer::Observer::Cie1931;
    for (i, s) in TCS.iter().enumerate() {
        let xyz = Cie1931.xyz(&crate::illuminant::CieIlluminant::D65, Some(s));
        let [r, g, b]: [u8; 3] = xyz.rgb(crate::rgb::RgbSpace::SRGB).clamp().into();
        println!("{:2} ({r:3},{g:3},{b:3})", i + 1);
    }
}

/// Spectral radiance factors of 14 test samples for the CIE colour rendering index calculation.
///
/// The data is defined over a wavelength domain of 380-780-5nm, and was downloaded from CIE
/// <http://cie.co.at>, public datasets, and truncated from 360 to 830nm range.
/// Data license: [CC BY-SA 4](https://creativecommons.org/licenses/by-sa/4.0/).
/// This data is used to generate an arra of 14 [Spectra], as used in this library, by interpolation
/// into a domain 380-780-1nm.
static TCS5: SMatrix<f64, 81, N_TCS> = SMatrix::from_array_storage(ArrayStorage([
    [
        0.219, 0.239, 0.252, 0.256, 0.256, 0.254, 0.252, 0.248, 0.244, 0.24, 0.237, 0.232, 0.23,
        0.226, 0.225, 0.222, 0.22, 0.218, 0.216, 0.214, 0.214, 0.214, 0.216, 0.218, 0.223, 0.225,
        0.226, 0.226, 0.225, 0.225, 0.227, 0.23, 0.236, 0.245, 0.253, 0.262, 0.272, 0.283, 0.298,
        0.318, 0.341, 0.367, 0.39, 0.409, 0.424, 0.435, 0.442, 0.448, 0.45, 0.451, 0.451, 0.451,
        0.451, 0.451, 0.45, 0.45, 0.451, 0.451, 0.453, 0.454, 0.455, 0.457, 0.458, 0.46, 0.462,
        0.463, 0.464, 0.465, 0.466, 0.466, 0.466, 0.466, 0.467, 0.467, 0.467, 0.467, 0.467, 0.467,
        0.467, 0.467, 0.467,
    ],
    [
        0.07, 0.079, 0.089, 0.101, 0.111, 0.116, 0.118, 0.12, 0.121, 0.122, 0.122, 0.122, 0.123,
        0.124, 0.127, 0.128, 0.131, 0.134, 0.138, 0.143, 0.15, 0.159, 0.174, 0.19, 0.207, 0.225,
        0.242, 0.253, 0.26, 0.264, 0.267, 0.269, 0.272, 0.276, 0.282, 0.289, 0.299, 0.309, 0.322,
        0.329, 0.335, 0.339, 0.341, 0.341, 0.342, 0.342, 0.342, 0.341, 0.341, 0.339, 0.339, 0.338,
        0.338, 0.337, 0.336, 0.335, 0.334, 0.332, 0.332, 0.331, 0.331, 0.33, 0.329, 0.328, 0.328,
        0.327, 0.326, 0.325, 0.324, 0.324, 0.324, 0.323, 0.322, 0.321, 0.32, 0.318, 0.316, 0.315,
        0.315, 0.314, 0.314,
    ],
    [
        0.065, 0.068, 0.07, 0.072, 0.073, 0.073, 0.074, 0.074, 0.074, 0.073, 0.073, 0.073, 0.073,
        0.073, 0.074, 0.075, 0.077, 0.08, 0.085, 0.094, 0.109, 0.126, 0.148, 0.172, 0.198, 0.221,
        0.241, 0.26, 0.278, 0.302, 0.339, 0.37, 0.392, 0.399, 0.4, 0.393, 0.38, 0.365, 0.349,
        0.332, 0.315, 0.299, 0.285, 0.272, 0.264, 0.257, 0.252, 0.247, 0.241, 0.235, 0.229, 0.224,
        0.22, 0.217, 0.216, 0.216, 0.219, 0.224, 0.23, 0.238, 0.251, 0.269, 0.288, 0.312, 0.34,
        0.366, 0.39, 0.412, 0.431, 0.447, 0.46, 0.472, 0.481, 0.488, 0.493, 0.497, 0.5, 0.502,
        0.505, 0.51, 0.516,
    ],
    [
        0.074, 0.083, 0.093, 0.105, 0.116, 0.121, 0.124, 0.126, 0.128, 0.131, 0.135, 0.139, 0.144,
        0.151, 0.161, 0.172, 0.186, 0.205, 0.229, 0.254, 0.281, 0.308, 0.332, 0.352, 0.37, 0.383,
        0.39, 0.394, 0.395, 0.392, 0.385, 0.377, 0.367, 0.354, 0.341, 0.327, 0.312, 0.296, 0.28,
        0.263, 0.247, 0.229, 0.214, 0.198, 0.185, 0.175, 0.169, 0.164, 0.16, 0.156, 0.154, 0.152,
        0.151, 0.149, 0.148, 0.148, 0.148, 0.149, 0.151, 0.154, 0.158, 0.162, 0.165, 0.168, 0.17,
        0.171, 0.17, 0.168, 0.166, 0.164, 0.164, 0.165, 0.168, 0.172, 0.177, 0.181, 0.185, 0.189,
        0.192, 0.194, 0.197,
    ],
    [
        0.295, 0.306, 0.31, 0.312, 0.313, 0.315, 0.319, 0.322, 0.326, 0.33, 0.334, 0.339, 0.346,
        0.352, 0.36, 0.369, 0.381, 0.394, 0.403, 0.41, 0.415, 0.418, 0.419, 0.417, 0.413, 0.409,
        0.403, 0.396, 0.389, 0.381, 0.372, 0.363, 0.353, 0.342, 0.331, 0.32, 0.308, 0.296, 0.284,
        0.271, 0.26, 0.247, 0.232, 0.22, 0.21, 0.2, 0.194, 0.189, 0.185, 0.183, 0.18, 0.177, 0.176,
        0.175, 0.175, 0.175, 0.175, 0.177, 0.18, 0.183, 0.186, 0.189, 0.192, 0.195, 0.199, 0.2,
        0.199, 0.198, 0.196, 0.195, 0.195, 0.196, 0.197, 0.2, 0.203, 0.205, 0.208, 0.212, 0.215,
        0.217, 0.219,
    ],
    [
        0.151, 0.203, 0.265, 0.339, 0.41, 0.464, 0.492, 0.508, 0.517, 0.524, 0.531, 0.538, 0.544,
        0.551, 0.556, 0.556, 0.554, 0.549, 0.541, 0.531, 0.519, 0.504, 0.488, 0.469, 0.45, 0.431,
        0.414, 0.395, 0.377, 0.358, 0.341, 0.325, 0.309, 0.293, 0.279, 0.265, 0.253, 0.241, 0.234,
        0.227, 0.225, 0.222, 0.221, 0.22, 0.22, 0.22, 0.22, 0.22, 0.223, 0.227, 0.233, 0.239,
        0.244, 0.251, 0.258, 0.263, 0.268, 0.273, 0.278, 0.281, 0.283, 0.286, 0.291, 0.296, 0.302,
        0.313, 0.325, 0.338, 0.351, 0.364, 0.376, 0.389, 0.401, 0.413, 0.425, 0.436, 0.447, 0.458,
        0.469, 0.477, 0.485,
    ],
    [
        0.378, 0.459, 0.524, 0.546, 0.551, 0.555, 0.559, 0.56, 0.561, 0.558, 0.556, 0.551, 0.544,
        0.535, 0.522, 0.506, 0.488, 0.469, 0.448, 0.429, 0.408, 0.385, 0.363, 0.341, 0.324, 0.311,
        0.301, 0.291, 0.283, 0.273, 0.265, 0.26, 0.257, 0.257, 0.259, 0.26, 0.26, 0.258, 0.256,
        0.254, 0.254, 0.259, 0.27, 0.284, 0.302, 0.324, 0.344, 0.362, 0.377, 0.389, 0.4, 0.41,
        0.42, 0.429, 0.438, 0.445, 0.452, 0.457, 0.462, 0.466, 0.468, 0.47, 0.473, 0.477, 0.483,
        0.489, 0.496, 0.503, 0.511, 0.518, 0.525, 0.532, 0.539, 0.546, 0.553, 0.559, 0.565, 0.57,
        0.575, 0.578, 0.581,
    ],
    [
        0.104, 0.129, 0.17, 0.24, 0.319, 0.416, 0.462, 0.482, 0.49, 0.488, 0.482, 0.473, 0.462,
        0.45, 0.439, 0.426, 0.413, 0.397, 0.382, 0.366, 0.352, 0.337, 0.325, 0.31, 0.299, 0.289,
        0.283, 0.276, 0.27, 0.262, 0.256, 0.251, 0.25, 0.251, 0.254, 0.258, 0.264, 0.269, 0.272,
        0.274, 0.278, 0.284, 0.295, 0.316, 0.348, 0.384, 0.434, 0.482, 0.528, 0.568, 0.604, 0.629,
        0.648, 0.663, 0.676, 0.685, 0.693, 0.7, 0.705, 0.709, 0.712, 0.715, 0.717, 0.719, 0.721,
        0.72, 0.719, 0.722, 0.725, 0.727, 0.729, 0.73, 0.73, 0.73, 0.73, 0.73, 0.73, 0.73, 0.73,
        0.73, 0.73,
    ],
    [
        0.066, 0.062, 0.058, 0.055, 0.052, 0.052, 0.051, 0.05, 0.05, 0.049, 0.048, 0.047, 0.046,
        0.044, 0.042, 0.041, 0.038, 0.035, 0.033, 0.031, 0.03, 0.029, 0.028, 0.028, 0.028, 0.029,
        0.03, 0.03, 0.031, 0.031, 0.032, 0.032, 0.033, 0.034, 0.035, 0.037, 0.041, 0.044, 0.048,
        0.052, 0.06, 0.076, 0.102, 0.136, 0.19, 0.256, 0.336, 0.418, 0.505, 0.581, 0.641, 0.682,
        0.717, 0.74, 0.758, 0.77, 0.781, 0.79, 0.797, 0.803, 0.809, 0.814, 0.819, 0.824, 0.828,
        0.83, 0.831, 0.833, 0.835, 0.836, 0.836, 0.837, 0.838, 0.839, 0.839, 0.839, 0.839, 0.839,
        0.839, 0.839, 0.839,
    ],
    [
        0.05, 0.054, 0.059, 0.063, 0.066, 0.067, 0.068, 0.069, 0.069, 0.07, 0.072, 0.073, 0.076,
        0.078, 0.083, 0.088, 0.095, 0.103, 0.113, 0.125, 0.142, 0.162, 0.189, 0.219, 0.262, 0.305,
        0.365, 0.416, 0.465, 0.509, 0.546, 0.581, 0.61, 0.634, 0.653, 0.666, 0.678, 0.687, 0.693,
        0.698, 0.701, 0.704, 0.705, 0.705, 0.706, 0.707, 0.707, 0.707, 0.708, 0.708, 0.71, 0.711,
        0.712, 0.714, 0.716, 0.718, 0.72, 0.722, 0.725, 0.729, 0.731, 0.735, 0.739, 0.742, 0.746,
        0.748, 0.749, 0.751, 0.753, 0.754, 0.755, 0.755, 0.755, 0.755, 0.756, 0.757, 0.758, 0.759,
        0.759, 0.759, 0.759,
    ],
    [
        0.111, 0.121, 0.127, 0.129, 0.127, 0.121, 0.116, 0.112, 0.108, 0.105, 0.104, 0.104, 0.105,
        0.106, 0.11, 0.115, 0.123, 0.134, 0.148, 0.167, 0.192, 0.219, 0.252, 0.291, 0.325, 0.347,
        0.356, 0.353, 0.346, 0.333, 0.314, 0.294, 0.271, 0.248, 0.227, 0.206, 0.188, 0.17, 0.153,
        0.138, 0.125, 0.114, 0.106, 0.1, 0.096, 0.092, 0.09, 0.087, 0.085, 0.082, 0.08, 0.079,
        0.078, 0.078, 0.078, 0.078, 0.081, 0.083, 0.088, 0.093, 0.102, 0.112, 0.125, 0.141, 0.161,
        0.182, 0.203, 0.223, 0.242, 0.257, 0.27, 0.282, 0.292, 0.302, 0.31, 0.314, 0.317, 0.323,
        0.33, 0.334, 0.338,
    ],
    [
        0.12, 0.103, 0.09, 0.082, 0.076, 0.068, 0.064, 0.065, 0.075, 0.093, 0.123, 0.16, 0.207,
        0.256, 0.3, 0.331, 0.346, 0.347, 0.341, 0.328, 0.307, 0.282, 0.257, 0.23, 0.204, 0.178,
        0.154, 0.129, 0.109, 0.09, 0.075, 0.062, 0.051, 0.041, 0.035, 0.029, 0.025, 0.022, 0.019,
        0.017, 0.017, 0.017, 0.016, 0.016, 0.016, 0.016, 0.016, 0.016, 0.016, 0.016, 0.018, 0.018,
        0.018, 0.018, 0.019, 0.02, 0.023, 0.024, 0.026, 0.03, 0.035, 0.043, 0.056, 0.074, 0.097,
        0.128, 0.166, 0.21, 0.257, 0.305, 0.354, 0.401, 0.446, 0.485, 0.52, 0.551, 0.577, 0.599,
        0.618, 0.633, 0.645,
    ],
    [
        0.104, 0.127, 0.161, 0.211, 0.264, 0.313, 0.341, 0.352, 0.359, 0.361, 0.364, 0.365, 0.367,
        0.369, 0.372, 0.374, 0.376, 0.379, 0.384, 0.389, 0.397, 0.405, 0.416, 0.429, 0.443, 0.454,
        0.461, 0.466, 0.469, 0.471, 0.474, 0.476, 0.483, 0.49, 0.506, 0.526, 0.553, 0.582, 0.618,
        0.651, 0.68, 0.701, 0.717, 0.729, 0.736, 0.742, 0.745, 0.747, 0.748, 0.748, 0.748, 0.748,
        0.748, 0.748, 0.748, 0.748, 0.747, 0.747, 0.747, 0.747, 0.747, 0.747, 0.747, 0.746, 0.746,
        0.746, 0.745, 0.744, 0.743, 0.744, 0.745, 0.748, 0.75, 0.75, 0.749, 0.748, 0.748, 0.747,
        0.747, 0.747, 0.747,
    ],
    [
        0.036, 0.036, 0.037, 0.038, 0.039, 0.039, 0.04, 0.041, 0.042, 0.042, 0.043, 0.044, 0.044,
        0.045, 0.045, 0.046, 0.047, 0.048, 0.05, 0.052, 0.055, 0.057, 0.062, 0.067, 0.075, 0.083,
        0.092, 0.1, 0.108, 0.121, 0.133, 0.142, 0.15, 0.154, 0.155, 0.152, 0.147, 0.14, 0.133,
        0.125, 0.118, 0.112, 0.106, 0.101, 0.098, 0.095, 0.093, 0.09, 0.089, 0.087, 0.086, 0.085,
        0.084, 0.084, 0.084, 0.084, 0.085, 0.087, 0.092, 0.096, 0.102, 0.11, 0.123, 0.137, 0.152,
        0.169, 0.188, 0.207, 0.226, 0.243, 0.26, 0.277, 0.294, 0.31, 0.325, 0.339, 0.353, 0.366,
        0.379, 0.39, 0.399,
    ],
]));