Luv to LCH(uv)

Equation 1

Implementation Notes:

  1. If H < 0°, add 360° to it.
  2. If H ≥ 360°, subtract 360° from it.
  3. In computing H, be careful with the inverse tangent since u could be zero. Instead, use special math functions to do this. In both the Standard C library and Java, this function is called atan2. In Microsoft Excel, it is called ATAN2. These special functions will compute the proper inverse tangents without needing to worry about "divide by zero" conditions.