I would recommend you to upgrade to the latest version of Magick.NET. Your command translates to this:
using (MagickImage image = new MagickImage()) { MagickReadSettings settings = new MagickReadSettings(); settings.Density = new MagickGeometry(1024); // -density 1024 image.Read("Sample.eps", settings); // "Sample.eps" image.Resize(1024, 768); // -geometry 1024x768 image.Trim(); // -trim image.Write("L.png"); // "L.png" }