My color space conversion class has been pushed to Bitbucket and Github. As this is managed code the conversions are not suitable for real time use, but more that suitable for general use. I did not use .Net Color structure in the conversions, I instead opted to use Numerics.Vector4. This allows the color conversions to take advantage of simd hardware where available.This will provide a speed up if your build is x64, with the optimize flag enabled. Here is a list of first release conversions available in the class.
All Conversion are in floating point and support an alpha channel. Each Method is overloaded for single color vector or for a color vector array. It is MIT licensed making it free to use for any purpose. If you wish to contribute just branch and let me know.