Replacing transparent background with white color in PNG images

Question

I have a PNG image being sent from a DrawingView in Android to a WCF service. The image is sent as a 32-bit and it has transparent background. I want to replace

Answer 1

This will draw onto a given color:

Bitmap Transparent2Color(Bitmap bmp1, Color target)
{
    Bitmap bmp2 = new Bitmap(bmp1.Width, bmp1.Height);
    Rectangle rect = new Rectangle(Point.Empty, bmp1.Size);
    using (Graphics G = Graphics.FromImage(bmp2) )
    {
        G.Clear(target);
        G.DrawImageUnscaledAndClipped(bmp1, rect);
    }
    return bmp2;
}

This makes use of the G.CompositingMode = System.Drawing.Drawing2D.CompositingMode.SourceOver;, which is the default. It blends the drawn image with the background according to the alpha channel of the drawn image.