Composing PNG Image over an Animated GIF File using Magick.NET?

[pariswhitney]

How is it possible with Magick.net in C# (not with CLI) to put an alpha.png image over an single animated.gif file and save this composing again as an single animated gif?

[dlemstra]

You can do that with the following sample:

using (var images = new MagickImageCollection("animated.gif"))
{
    images.Coalesce();

    using (var alpha = new MagickImage("alpha.png"))
    {
        foreach (var image in images)
        {
            image.Composite(alpha, CompositeOperator.Over);
        }
    }

    images.Optimize();

    images.Write("output.gif");
}