The settings.Density property does not support percentages. You are reading the image at 1200 DPI. You probably don't need a value that high. I think you should rewrite your code to something like this:
string fileType = "png"; int inputDensity = new MagickGeometry(300); int outputDensity = new MagickGeometry(72); MagickReadSettings settings = new MagickReadSettings(); settings.Density = inputDensity; settings.ColorSpace = ColorSpace.RGB; using (MagickImage image = new MagickImage()) { // Add all the pages of the pdf? file to the collection image.Read(@"C:\Users\User\Desktop\8060.emf", settings); image.Format = (MagickFormat)Enum.Parse(typeof(MagickFormat), fileType, true); image.BackgroundColor = new MagickColor(255, 255, 255); image.Resample(outputDensity); image.Write(@"C:\Users\Cathal Colgan\Desktop\test1." + fileType); }