Without seeing your input image I am guessing that you have your words on a colored background. I am thinking that because of your other post here: https://magick.codeplex.com/discussions/661233. Below is an example of how you could create the image you want:
string word = "Hello"; using (MagickImage background = new MagickImage("background.png")) { using (MagickImageCollection collection = new MagickImageCollection()) { for (int i = 1; i < word.Length + 1; i++) { MagickImage frame = background.Clone(); frame.AnimationIterations = 1; frame.AnimationDelay = 100; new Drawables() .FillColor(MagickColors.Fuchsia) .Font("Times New Roman") .FontPointSize(90) .Text(50, 200, word.Substring(0, i)) .Draw(frame); collection.Add(frame); } // This will reduce the size of your file. collection.Optimize(); collection.Write("test.gif"); } }