AnnStampObject transparent background image

I need burn a picture(signature) into a image. I am using automation and AnnStampObject. The transparent backgroud is lost when I burn the stamp. Could you help? Here is my code.

Dim pic As AnnPicture = New AnnPicture(Image.FromFile(signatureFilePath))
pic.TransparentMode = AnnPictureTransparentMode.TopLeftPixel
signature.Picture = pic

My picture is a gif with transparent backgroud. It looks good before burn..

To burn a transparent stamp image on an image, use the following code:
+=======================================================+
AnnPicture mypic = new AnnPicture();
mypic.Image = Image.FromFile(@"C:\Users\Public\Documents\LEADTOOLS Images\LittleGFlyingAlpha.png");
AnnStampObject mystamp = new AnnStampObject();
mystamp.Picture = mypic;
mystamp.Bounds = new AnnRectangle(rasterImageViewer1.Image.Width / 2, rasterImageViewer1.Image.Height /2, 390, 390, AnnUnit.Pixel);
Leadtools.Drawing.RasterImageGdiPlusGraphicsContainer GraphicsContainer = new Leadtools.Drawing.RasterImageGdiPlusGraphicsContainer(rasterImageViewer1.Image);
mystamp.Draw(GraphicsContainer.Graphics);
+=======================================================+

It tried your code with no success. I am using automation. I changed realize to your code. Actually before I used automation, I was using a code similar to yours without using automation. The transparent background worked fine. Is this because of automation? Thanks!

I tested the code again and it worked fine. I added the code under "button5_Click" function.
Please try the attached project and if the problem persists, please send me your sample images (main image and stamp image) and explain what you want the result to look like.
About using the automation, you can loop all the AnnObject and call AnnObject.Draw() method
If you send any files, make sure to put them in a ZIP or RAR file to ensure our servers deliver them correctly.