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Add To/From YUV methods to Color4.

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Fraser Waters 2014-11-10 02:42:12 +01:00
parent 679419bb67
commit edcb0664b1
1 changed files with 41 additions and 0 deletions
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41
Source/OpenTK/Graphics/Color4.cs
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@ -1276,6 +1276,47 @@ namespace OpenTK.Graphics
return new Vector4(x, y, z, rgb.A);
}
#endregion
#region YUV
/// <summary>
/// Converts YCbCr color values to RGB color values.
/// </summary>
/// <returns>
/// Returns the converted color value.
/// </returns>
/// <param name="ycbcr">
/// Color value to convert in Luma-Chrominance (YCbCr) aka YUV.
/// The X element contains Luma (Y, 0.0 to 1.0), the Y element contains Blue-difference chroma (U, -0.5 to 0.5), the Z element contains the Red-difference chroma (V, -0.5 to 0.5), and the W element contains the Alpha (which is copied to the output's Alpha value).
/// </param>
/// <remarks>Converts using ITU-R BT.601/CCIR 601 W(r) = 0.299 W(b) = 0.114 U(max) = 0.436 V(max) = 0.615.</remarks>
public static Color4 FromYcbcr(Vector4 ycbcr)
{
var r = 1.0f * ycbcr.X + 0.0f * ycbcr.Y + 1.402f * ycbcr.Z;
var g = 1.0f * ycbcr.X + -0.344136f * ycbcr.Y + -0.714136f * ycbcr.Z;
var b = 1.0f * ycbcr.X + 1.772f * ycbcr.Y + 0.0f * ycbcr.Z;
return new Color4(r, g, b, ycbcr.W);
}
/// <summary>
/// Converts RGB color values to YUV color values.
/// </summary>
/// <returns>
/// Returns the converted color value in Luma-Chrominance (YCbCr) aka YUV.
/// The X element contains Luma (Y, 0.0 to 1.0), the Y element contains Blue-difference chroma (U, -0.5 to 0.5), the Z element contains the Red-difference chroma (V, -0.5 to 0.5), and the W element contains the Alpha (a copy of the input's Alpha value).
/// Each has a range of 0.0 to 1.0.
/// </returns>
/// <param name="rgb">Color value to convert.</param>
/// <remarks>Converts using ITU-R BT.601/CCIR 601 W(r) = 0.299 W(b) = 0.114 U(max) = 0.436 V(max) = 0.615.</remarks>
public static Vector4 ToYcbcr(Color4 rgb)
{
var y = 0.299f * rgb.R + 0.587f * rgb.G + 0.114f * rgb.B;
var u = -0.168736f * rgb.R + -0.331264f * rgb.G + 0.5f * rgb.B;
var v = 0.5f * rgb.R + -0.418688f * rgb.G + -0.081312f * rgb.B;
return new Vector4(y, u, v, rgb.A);
}
#endregion
#endregion