RGB To YCbCr

This algorithm converts RGB color model to YCbCr color space.

• C#
• VB.Net
• C
• C++
• PHP

									public struct RGB
{
	private byte _r;
	private byte _g;
	private byte _b;

	public RGB(byte r, byte g, byte b)
	{
		this._r = r;
		this._g = g;
		this._b = b;
	}

	public byte R
	{
		get { return this._r; }
		set { this._r = value; }
	}

	public byte G
	{
		get { return this._g; }
		set { this._g = value; }
	}

	public byte B
	{
		get { return this._b; }
		set { this._b = value; }
	}

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

public struct YCbCr
{
	private float _y;
	private float _cb;
	private float _cr;

	public YCbCr(float y, float cb, float cr)
	{
		this._y = y;
		this._cb = cb;
		this._cr = cr;
	}

	public float Y
	{
		get { return this._y; }
		set { this._y = value; }
	}

	public float Cb
	{
		get { return this._cb; }
		set { this._cb = value; }
	}

	public float Cr
	{
		get { return this._cr; }
		set { this._cr = value; }
	}

	public bool Equals(YCbCr ycbcr)
	{
		return (this.Y == ycbcr.Y) && (this.Cb == ycbcr.Cb) && (this.Cr == ycbcr.Cr);
	}
}

public static YCbCr RGBToYCbCr(RGB rgb)
{
	float fr = (float)rgb.R / 255;
	float fg = (float)rgb.G / 255;
	float fb = (float)rgb.B / 255;

	float Y = (float)(0.2989 * fr + 0.5866 * fg + 0.1145 * fb);
	float Cb = (float)(-0.1687 * fr - 0.3313 * fg + 0.5000 * fb);
	float Cr = (float)(0.5000 * fr - 0.4184 * fg - 0.0816 * fb);

	return new YCbCr(Y, Cb, Cr);
}
								

Example

									RGB data = new RGB(82, 0, 87);
YCbCr value = RGBToYCbCr(data);
								

Output

									Y: 0.135181576
Cb: 0.116339609
Cr: 0.132944316