Serve Umbraco image property with static Url

ImagesController.cs

using System.Linq;
using System.Web;
using System.Web.Mvc;
using Newtonsoft.Json.Linq;
using Umbraco.Core.Composing;
using Umbraco.Core.Models.PublishedContent;
using Umbraco.Web;
using Umbraco.Web.Mvc;
using Umbraco.Web.PublishedModels;

namespace Site.Core.Controllers
{
    public class ImagesController : SurfaceController
    {
        private FileContentResult getFileContentResult(IPublishedContent media)
        {
            var umbracoFile = media.HasProperty("umbracoFile") && media.HasValue("umbracoFile") ? media.Value<string>("umbracoFile") : null;
            var umbracoFileObject = JObject.Parse(umbracoFile);
            var src = umbracoFileObject.GetValue("src") != null ? umbracoFileObject.GetValue("src").ToString() : null;
            var fileExtension = media.Value<string>("umbracoExtension");
            if (src != null)
            {
                using (var fileStream = Current.MediaFileSystem.OpenFile(src))
                {
                    byte[] fileBytes = null;
                    using (var memoryStream = new System.IO.MemoryStream())
                    {
                        fileStream.CopyTo(memoryStream);
                        fileBytes = memoryStream.ToArray();
                    }

                    return File(fileBytes, MimeMapping.GetMimeMapping("image/" + fileExtension), media.Name + "." + fileExtension);
                }
            }

            return null;
        }


        public FileContentResult Emailheader()
        {
            var homepage = Umbraco.ContentAtRoot().FirstOrDefault(x => x.ContentType.Alias == Homepage.ModelTypeAlias) as Homepage;
            var headerImage = homepage.Emailheader;

            if (headerImage != null)
            {
                var publishedMedia = headerImage.MediaItem;
                getFileContentResult(publishedMedia);
            }
            return null;
        }

        public FileContentResult Emailfooter()
        {
            var homepage = Umbraco.ContentAtRoot().FirstOrDefault(x => x.ContentType.Alias == Homepage.ModelTypeAlias) as Homepage;
            var footerImage = homepage.Emailfooter;

            if (footerImage != null)
            {
                var publishedMedia = footerImage.MediaItem;
                getFileContentResult(publishedMedia);
            }
            return null;
        }
    }

}