/// <summary>
/// Convert from RGB to YCbCr color space (Rec 601-1 specification).
/// </summary>
///
/// <param name="rgb">Source color in <b>RGB</b> color space.</param>
/// <param name="ycbcr">Destination color in <b>YCbCr</b> color space.</param>
///
public static void RGB2YCbCr(RGB rgb, YCbCr ycbcr)
{
double r = (double)rgb.Red / 255;
double g = (double)rgb.Green / 255;
double b = (double)rgb.Blue / 255;
ycbcr.Y = 0.2989 * r + 0.5866 * g + 0.1145 * b;
ycbcr.Cb = -0.1687 * r - 0.3313 * g + 0.5000 * b;
ycbcr.Cr = 0.5000 * r - 0.4184 * g - 0.0816 * b;
}
/// <summary>
/// Convert from YCbCr to RGB color space.
/// </summary>
///
/// <param name="ycbcr">Source color in <b>YCbCr</b> color space.</param>
/// <param name="rgb">Destination color in <b>RGB</b> color spacs.</param>
///
public static void YCbCr2RGB(YCbCr ycbcr, RGB rgb)
{
// don't warry about zeros. compiler will remove them
double r = Math.Max(0.0, Math.Min(1.0, ycbcr.Y + 0.0000 * ycbcr.Cb + 1.4022 * ycbcr.Cr));
double g = Math.Max(0.0, Math.Min(1.0, ycbcr.Y - 0.3456 * ycbcr.Cb - 0.7145 * ycbcr.Cr));
double b = Math.Max(0.0, Math.Min(1.0, ycbcr.Y + 1.7710 * ycbcr.Cb + 0.0000 * ycbcr.Cr));
rgb.Red = (byte)(r * 255);
rgb.Green = (byte)(g * 255);
rgb.Blue = (byte)(b * 255);
}
