How to tint a bitmap... *Solved*

[NinjaNic]

Hello!
I'm trying out new things on VB, and now I want to know how to tint a bitmap image. I've googled it, and I've found this:

Imports System.Drawing.Imaging
Public Class Form1
 
    Dim bit As Bitmap = New Bitmap(My.Resources.test)
 
    Private Function TintBitmap(b As Bitmap, color As Color, intensity As Single) As Bitmap
        Dim b2 As New Bitmap(b.Width, b.Height)
 
        Dim ia As New ImageAttributes
 
        Dim m As ColorMatrix
        m = New ColorMatrix(New Single()() _
            {New Single() {1, 0, 0, 0, 0}, _
             New Single() {0, 1, 0, 0, 0}, _
             New Single() {0, 0, 1, 0, 0}, _
             New Single() {0, 0, 0, 1, 0}, _
             New Single() {color.R / 255 * intensity, color.G / 255 * intensity, color.B / 255 * intensity, 0, 1}})
 
        ia.SetColorMatrix(m)
        Dim g As Graphics = Graphics.FromImage(b2)
        g.DrawImage(b, New Rectangle(0, 0, b.Width, b.Height), 0, 0, b.Width, b.Height, GraphicsUnit.Pixel, ia)
        Return b2
 
    End Function
 
    Private Sub PictureBox1_Paint(sender As Object, e As System.Windows.Forms.PaintEventArgs) Handles PictureBox1.Paint
        PictureBox1.Image = TintBitmap(bit, Color.Red, 0.5)
    End Sub
End Class

It works, but can someone please explain to me what this code means; what I am doing? What is a color matrix?
Thanks!