At this moment you cannot do that but with the next release of Magick.NET (7.0.0.0006) you will be able to do the following:
This will return an image that fits inside a 3000x3000 square. This will make your cartoon network logo 3000x808.
MagickImage magickImage1 = new MagickImage(); magickImage1.SetDefine(MagickFormat.Eps, "fit-page", "3000x3000"); // Fit inside 3000x3000 square magickImage1.Read(sourceFilePath);