HSL To RGB

This algorithm converts HSL color model to RGB color model.

• C#
• VB.Net
• C
• C++
• PHP

									class RGB
{
public:
	unsigned char R;
	unsigned char G;
	unsigned char B;

	RGB(unsigned char r, unsigned char g, unsigned char b)
	{
		R = r;
		G = g;
		B = b;
	}

	bool Equals(RGB rgb)
	{
		return (R == rgb.R) && (G == rgb.G) && (B == rgb.B);
	}
};

class HSL
{
public:
	int H;
	float S;
	float L;

	HSL(int h, float s, float l)
	{
		H = h;
		S = s;
		L = l;
	}

	bool Equals(HSL hsl)
	{
		return (H == hsl.H) && (S == hsl.S) && (L == hsl.L);
	}
};

static float HueToRGB(float v1, float v2, float vH) {
	if (vH < 0)
		vH += 1;

	if (vH > 1)
		vH -= 1;

	if ((6 * vH) < 1)
		return (v1 + (v2 - v1) * 6 * vH);

	if ((2 * vH) < 1)
		return v2;

	if ((3 * vH) < 2)
		return (v1 + (v2 - v1) * ((2.0f / 3) - vH) * 6);

	return v1;
}

static RGB HSLToRGB(HSL hsl) {
	unsigned char r = 0;
	unsigned char g = 0;
	unsigned char b = 0;

	if (hsl.S == 0)
	{
		r = g = b = (unsigned char)(hsl.L * 255);
	}
	else
	{
		float v1, v2;
		float hue = (float)hsl.H / 360;

		v2 = (hsl.L < 0.5) ? (hsl.L * (1 + hsl.S)) : ((hsl.L + hsl.S) - (hsl.L * hsl.S));
		v1 = 2 * hsl.L - v2;

		r = (unsigned char)(255 * HueToRGB(v1, v2, hue + (1.0f / 3)));
		g = (unsigned char)(255 * HueToRGB(v1, v2, hue));
		b = (unsigned char)(255 * HueToRGB(v1, v2, hue - (1.0f / 3)));
	}

	return RGB(r, g, b);
}
								

Example

									HSL data = HSL(138, 0.50f, 0.76f);
RGB value = HSLToRGB(data);
								

Output

									R: 163
G: 224
B: 181