Conversion from HLS direct to HSV and back

hlshsv.cs

/* This file is in the public domain. Peter O., 2012. http://upokecenter.dreamhosters.com 
    Public domain dedication: http://creativecommons.org/publicdomain/zero/1.0/  */
using System;

namespace PeterO
{
	public class ColorUtil
	{
                // Assumes hsv[0] is from 0-360, and hsv[1] and hsv[2] are from 0-1
		public static double[] HsvToHls(double[] hsv){
			double luminance=hsv[2]*(1.0-(hsv[1]/2.0));
			double saturation;
			if(luminance<=0.5){
				saturation=(luminance==0) ? 0 : hsv[1]*hsv[2]/(luminance*2);
			} else {
				double lumFactor=(0.5-(luminance-0.5));
				saturation=(lumFactor==0) ? 1.0f : hsv[1]*hsv[2]/(lumFactor*2);
			}
			return new double[]{hsv[0],luminance,saturation};
		}
                // Assumes hls[0] is from 0-360, and hls[1] and hls[2] are from 0-1
		public static double[] HlsToHsv(double[] hls){
			double saturation=0.0;
			double value=0.0;
			if(hls[1]>0){
				double lumScale=1.0-Math.Max(hls[1]-0.5,0)*2;
				lumScale=(lumScale==0) ? 0 : 1.0/lumScale;
				double lumStart=Math.Max(0,lumScale-0.5);
				double lumDiv=(lumScale-lumStart);
				lumDiv=(lumStart+(hls[2]*lumDiv));
				saturation=(lumDiv==0) ? 0 : (hls[2]/lumDiv);
				value=hls[1]+(1.0-hls[1])*hls[2];
			}
			return new double[]{hls[0],saturation,value};
		}
	}
}