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Color Rendering of Spectra
{
const height = 66;
const context = DOM.context2d(width, height, 1);
context.canvas.style.imageRendering = "pixelated";
for (let x = 0; x < width; ++x) {
const t = (x / width) * 20000 + 1000;
const xyz = spectrum_xyz(v => bb_spectrum(v, t));
const rgb = xyz_rgb(normalize(xyz));
context.fillStyle = `rgb(${rgb.map(c => Math.round(c * 255))})`;
context.fillRect(x, 0, 1, height);
}
yield context.canvas;
}
function bb_spectrum(v, T) {
return 2 * h * (v ** 3) / (c ** 2) / (Math.exp(h * v / (k * T)) - 1);
}
function spectrum_xyz(spectrum) {
let X = 0, Y = 0, Z = 0;
for (let i = -1, lambda = 390; lambda <= 830; ++lambda) {
const v = c / (lambda * 1e-9);
const B = spectrum(v);
X += B * cmf[++i];
Y += B * cmf[++i];
Z += B * cmf[++i];
}
const K = X + Y + Z;
return [X / K, Y / K, Z / K];
}
function normalize(color) {
const max = Math.max(...color);
return max > 0 ? color.map(c => c / max) : color;
}
function xyz_rgb(xyz) {
return lrgb_rgb(matrix_multiply_vector(matrix_xyzd50_lrgb, xyz));
}
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