react-native-filament/lib/module/utilities/convertKelvinToLinearSRGB.js

A real-time physically based 3D rendering engine for React Native

// Converts sRGB to linear light
function toLinear(c) {
  'worklet';

  return c <= 0.04045 ? c / 12.92 : ((c + 0.055) / 1.055) ** 2.4;
}

// Converts a Kelvin temp to linear sRGB color
export default function convertKelvinToLinearSRGB(kelvin) {
  'worklet';

  const temp = kelvin / 100;
  let red, green, blue;
  if (temp <= 66) {
    red = 255;
    green = temp < 19 ? 0 : 99.4708025861 * Math.log(temp - 10) - 161.1195681661;
  } else {
    red = 329.698727446 * (temp - 60) ** -0.1332047592;
    green = 288.1221695283 * (temp - 60) ** -0.0755148492;
  }
  if (temp >= 66) {
    blue = 255;
  } else if (temp <= 19) {
    blue = 0;
  } else {
    blue = 138.5177312231 * Math.log(temp - 10) - 305.0447927307;
  }
  const r = toLinear(Math.max(0, Math.min(255, red)) / 255);
  const g = toLinear(Math.max(0, Math.min(255, green)) / 255);
  const b = toLinear(Math.max(0, Math.min(255, blue)) / 255);
  return [r, g, b];
}
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