iTextSharp.text.pdf.codec.TIFFField.GetAsRational C# (CSharp) Метод

        public long[] GetAsRational(int index) {
            if (type == TIFF_LONG)
                return GetAsLongs();
            return ((long[][])data)[index];
        }

 static int GetDpi(TIFFField fd, int resolutionUnit) {
     if (fd == null)
         return 0;
     long[] res = fd.GetAsRational(0);
     float frac = (float)res[0] / (float)res[1];
     int dpi = 0;
     switch (resolutionUnit) {
         case TIFFConstants.RESUNIT_INCH:
         case TIFFConstants.RESUNIT_NONE:
             dpi = (int)(frac + 0.5);
             break;
         case TIFFConstants.RESUNIT_CENTIMETER:
             dpi = (int)(frac * 2.54 + 0.5);
             break;
     }
     return dpi;
 }