public override int ColumnCount {get;}

{
  // read the jpeg into a buffer
  //At 3.0 you need https://www.nuget.org/packages/Microsoft.Windows.Compatibility
  //System.Drawing
  System.Drawing.Image image = System.Drawing.Image.FromFile(@"C:\temp\myImageFile.jpg");
  MemoryStream memoryStream = new MemoryStream();

  System.Drawing.Imaging.ImageFormat format = System.Drawing.Imaging.ImageFormat.Jpeg;
  image.Save(memoryStream, format);
  byte[] imageBuffer = memoryStream.ToArray();

  var jpgTexture = new JPEGTexture(imageBuffer);

  // texture properties
  int bpp = jpgTexture.BytesPerPixel;
  int columnCount = jpgTexture.ColumnCount;
  int rowCount = jpgTexture.RowCount;

  // build the textureResource and the material
  BasicMaterial material = new BasicMaterial();
  material.TextureResource = new TextureResource(jpgTexture);
}