Unity C# Methods to convert between RGB and HSV colors

Colors.cs

using UnityEngine;
using System.Collections;

public static class Colors
{

	public static Color ColorFromHSV(float h, float s, float v, float a = 1)
	{
		// no saturation, we can return the value across the board (grayscale)
		if (s == 0)
			return new Color(v, v, v, a);
		
		// which chunk of the rainbow are we in?
		float sector = h / 60;
		
		// split across the decimal (ie 3.87 into 3 and 0.87)
		int i = (int)sector;
		float f = sector - i;
		
		float p = v * (1 - s);
		float q = v * (1 - s * f);
		float t = v * (1 - s * (1 - f));
		
		// build our rgb color
		Color color = new Color(0, 0, 0, a);
		
		switch(i)
		{
		case 0:
			color.r = v;
			color.g = t;
			color.b = p;
			break;
			
		case 1:
			color.r = q;
			color.g = v;
			color.b = p;
			break;
			
		case 2:
			color.r  = p;
			color.g  = v;
			color.b  = t;
			break;
			
		case 3:
			color.r  = p;
			color.g  = q;
			color.b  = v;
			break;
			
		case 4:
			color.r  = t;
			color.g  = p;
			color.b  = v;
			break;
			
		default:
			color.r  = v;
			color.g  = p;
			color.b  = q;
			break;
		}
		
		return color;
	}

	public  static void ColorToHSV(Color color, out float h, out float s, out float v)
	{
		float min = Mathf.Min(Mathf.Min(color.r, color.g), color.b);
		float max = Mathf.Max(Mathf.Max(color.r, color.g), color.b);
		float delta = max - min;
		
		// value is our max color
		v = max;
		
		// saturation is percent of max
		if (!Mathf.Approximately(max, 0))
			s = delta / max;
		else
		{
			// all colors are zero, no saturation and hue is undefined
			s = 0;
			h = -1;
			return;
		}
		
		// grayscale image if min and max are the same
		if (Mathf.Approximately(min, max))
		{
			v = max;
			s = 0;
			h = -1;
			return;
		}
		
		// hue depends which color is max (this creates a rainbow effect)
		if (color.r == max)
			h = (color.g - color.b) / delta;         	// between yellow & magenta
		else if (color.g == max)
			h = 2 + (color.b - color.r) / delta; 		// between cyan & yellow
		else
			h = 4 + (color.r - color.g) / delta; 		// between magenta & cyan
		
		// turn hue into 0-360 degrees
		h *= 60;
		if (h < 0 )
			h += 360;
	}
}