Flutter: Convert color temperature to RGB

Question

I am looking for a way to convert a color temperature to its approximate RGB color in Flutter. If you have a look at this website, a color temperature of 1800 equals some kind of orange:

Is there a convenient way to do this in Flutter? The website I found seems to have hardcoded the colors. Providing me with a formula would also be appreaciated.

see [Star B-V color index to apparent RGB color](https://stackoverflow.com/a/22630970/2521214) — Spektre, Sep 22 '22 at 08:53

score 2 · Accepted Answer · answered Jan 10 '22 at 17:30

This blog has a formula available in several languages. Below is my port to Dart/Flutter.

Color colorTempToRGB(double colorTemp) {
  final temp = colorTemp / 100;

  final red = temp <= 66
      ? 255
      : (pow(temp - 60, -0.1332047592) * 329.698727446).round().clamp(0, 255);

  final green = temp <= 66
      ? (99.4708025861 * log(temp) - 161.1195681661).round().clamp(0, 255)
      : (pow(temp - 60, -0.0755148492) * 288.1221695283).round().clamp(0, 255);

  final blue = temp >= 66
      ? 255
      : temp <= 19
          ? 0
          : (138.5177312231 * log(temp - 10) - 305.0447927307)
              .round()
              .clamp(0, 255);

  return Color.fromARGB(255, red, green, blue);
}

Flutter: Convert color temperature to RGB

1 Answers1