Can you explain what are the numbers: 5932 + 6185 +5168? And are you using Magick.NET to take a screenshot? You can do that by reading an image with the name "screenshot:"
// Can you also use screenshot:[1] if you have multiple monitors.using (MagickImage mImage = new MagickImage("screenshot:")) { bytes = mImage.ToByteArray(MagickFormat.Jpg); }