You have to use a ColorMatrix to blend images. Here’s a C# control I wrote a while ago, it shows you the basic code you’ll need. Not VB.NET code but, hey, you didn’t try real hard either:
using System;
using System.Drawing;
using System.Drawing.Imaging;
using System.Windows.Forms;
public class BlendPanel : Panel {
public BlendPanel() {
DoubleBuffered = true;
}
public Image Image1 {
get { return mImg1; }
set { mImg1 = value; Invalidate(); }
}
public Image Image2 {
get { return mImg2; }
set { mImg2 = value; Invalidate(); }
}
public float Blend {
get { return mBlend; }
set { mBlend = value; Invalidate(); }
}
protected override void OnPaint(PaintEventArgs e) {
if (mImg1 == null || mImg2 == null)
e.Graphics.FillRectangle(new SolidBrush(this.BackColor), new Rectangle(0, 0, this.Width, this.Height));
else {
Rectangle rc = new Rectangle(0, 0, this.Width, this.Height);
ColorMatrix cm = new ColorMatrix();
ImageAttributes ia = new ImageAttributes();
cm.Matrix33 = mBlend;
ia.SetColorMatrix(cm);
e.Graphics.DrawImage(mImg2, rc, 0, 0, mImg2.Width, mImg2.Height, GraphicsUnit.Pixel, ia);
cm.Matrix33 = 1F - mBlend;
ia.SetColorMatrix(cm);
e.Graphics.DrawImage(mImg1, rc, 0, 0, mImg1.Width, mImg1.Height, GraphicsUnit.Pixel, ia);
}
base.OnPaint(e);
}
private Image mImg1;
private Image mImg2;
private float mBlend;
}