Vb.net 我如何扩展这个函数？

我创建了一个重新着色函数来重新着色我的图片框

我的函数是红色的，它把所有的东西都变成红色

但是现在我想输入一些滚动条函数来控制它

如果我想要3个代表R，G，B的滚动条

根据我目前的职能，我如何才能做到这一点

    Try
        ' Retrieve the image.
        image1 = New Bitmap("C:\Users\Anons\Desktop\Winter.jpg", True)

        Dim x, y As Integer

        ' Loop through the images pixels to reset color.
        For x = 0 To image1.Width - 1
            For y = 0 To image1.Height - 1
                Dim pixelColor As Color = image1.GetPixel(x, y)
                Dim newColor As Color = _
                    Color.FromArgb(pixelColor.R, 0, 0)
                image1.SetPixel(x, y, newColor)
            Next
        Next

        ' Set the PictureBox to display the image.
        PictureBox1.Image = image1

        ' Display the pixel format in Label1.
        Label1.Text = "Pixel format: " + image1.PixelFormat.ToString()

    Catch ex As ArgumentException
        MessageBox.Show("There was an error." _
            & "Check the path to the image file.")
    End Try
End Sub$

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只需将所有三个颜色分量（R、G和B）乘以由滚动条确定的分数因子即可。例如，系数为1将使其保持相同的颜色。因子0.5将使颜色亮度减半。系数为2会使其亮度加倍，等等

Dim rFactor As Single = rScroll.Value / 100
Dim gFactor As Single = gScroll.Value / 100
Dim bFactor As Single = bScroll.Value / 100
Dim newColor As Color = Color.FromArgb(pixelColor.R * rFactor, pixelColor.R * gFactor, pixelColor.B * bFactor)

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我是否在函数中声明这些因子？我已经在示例中演示了如何声明它们。您在理解示例的哪一部分时遇到困难？