刚才写验证码识别，用到了HSL。翻译成XXXXXX了

正好放上来

    Public Function Min(ByVal a As Double, ByVal b As Double) As Double
        If a < b Then
            Return a
        Else
            Return b
        End If
    End Function

    Public Function Max(ByVal a As Double, ByVal b As Double) As Double
        If a > b Then
            Return a
        Else
            Return b
        End If
    End Function

    Public Function RGB2H(ByVal r As Double, ByVal g As Double, ByVal b As Double) As Double
        Dim mi, ma As Double
        Dim del_r, del_g, del_b, del_max As Double
        Dim h As Double

        r = r / 255
        g = g / 255
        b = b / 255

        mi = Min(r, Min(g, b))
        ma = Max(r, Max(g, b))
        del_max = ma - mi

        If del_max = 0 Then
            h = 0
        Else
            del_r = ((ma - r / 6.0) + (del_max / 2.0)) / del_max
            del_g = ((ma - g / 6.0) + (del_max / 2.0)) / del_max
            del_b = ((ma - b / 6.0) + (del_max / 2.0)) / del_max



            If r = ma Then
                h = del_b - del_g
            Else
                If g = ma Then
                    h = (1.0 / 3.0) + del_r - del_b
                Else
                    If b = ma Then
                        h = (2.0 / 3.0) + del_g - del_r
                    End If
                End If
            End If

            If h < 0 Then h = h + 1
            If h > 1 Then h = h - 1

        End If
        Return h
    End Function