For future readers, VB.NET 2017 and above now supports value tuples as a language feature. You declare your function as follows:
Function ColorToHSV(clr As System.Drawing.Color) As (hue As Double, saturation As Double, value As Double)
Dim max As Integer = Math.Max(clr.R, Math.Max(clr.G, clr.B))
Dim min As Integer = Math.Min(clr.R, Math.Min(clr.G, clr.B))
Dim h = clr.GetHue()
Dim s = If((max = 0), 0, 1.0 - (1.0 * min / max))
Dim v = max / 255.0
Return (h, s, v)
End Function
And you call it like this:
Dim MyHSVColor = ColorToHSV(clr)
MsgBox(MyHSVColor.hue)
Note how VB.NET creates public property named hue
inferred from the return type of the called function. Intellisense too works properly for these members.
Note however that you need to target .NET Framework 4.7 for this to work. Alternately you can install System.ValueTuple
(available as NuGet package) in your project to take advantage of this feature.