public static Bitmap ToSepia(Bitmap source)
{
using (ColorMatrix saturation = new ColorMatrix())
using (ColorMatrix rgbFilter = new ColorMatrix())
{
saturation.SetSaturation(0f);
rgbFilter.SetScale(1.0f, 0.95f, 0.82f, 1.0f);
saturation.SetConcat(rgbFilter, saturation);
return(ColorSpaceTransformation.ToColorSpace(source, saturation));
}
}