Converting a multipage PDF to a multipage TIFF using color detection in C#

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//We assume that GdPicture has been correctly installed and unlocked.
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const string INPUT_DOCUMENT = "input.pdf";
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const string OUTPUT_DOCUMENT = "output.tif";
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const float DPI = 200F;
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GdPicturePDF oGdPicturePDF = new GdPicturePDF();
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GdPictureImaging oGdPictureImaging = new GdPictureImaging();
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if (oGdPicturePDF.LoadFromFile(INPUT_DOCUMENT, false) == GdPictureStatus.OK)
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{
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   int tiffID = 0;
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   for (int i = 0; i < oGdPicturePDF.GetPageCount(); i++)
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   {
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    oGdPicturePDF.SelectPage(i + 1);
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    //Rasterizing a page or extracting a page bitmap.
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    int rasterPage = oGdPicturePDF.RenderPageToGdPictureImageEx(DPI, true, System.Drawing.Imaging.PixelFormat.Format24bppRgb);
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    if (oGdPicturePDF.GetStat() == GdPictureStatus.OK)
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    {
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     //Defining the compression of the tiff page. Let's use CCITT4 for bitonal pages and JPEG for others.
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     TiffCompression tiffCompression;
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     //Applying color detection and color depth automatic conversion.
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     oGdPictureImaging.ColorDetection(rasterPage, true, false, false);
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     if (oGdPictureImaging.GetBitDepth(rasterPage) == 1)
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     {
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      tiffCompression = TiffCompression.TiffCompressionCCITT4;
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     }
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     else
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     {
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      tiffCompression = TiffCompression.TiffCompressionJPEG;
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     }
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     if (i == 0)
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     {
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      if (oGdPictureImaging.TiffSaveAsMultiPageFile(rasterPage, OUTPUT_DOCUMENT, tiffCompression) == GdPictureStatus.OK)
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      {
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         //Firstly rasterized page's GdPicture ID becomes the multipage tiff id.
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         tiffID = rasterPage;
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      }
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      else
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      {
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         MessageBox.Show("Error occurred when saving the file. Status: " + oGdPictureImaging.GetStat().ToString(), "Color Detection Example", MessageBoxButtons.OK, MessageBoxIcon.Error);
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         break;
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      }
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     }
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     else
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     {
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      if (oGdPictureImaging.TiffAddToMultiPageFile(tiffID, rasterPage, tiffCompression) != GdPictureStatus.OK)
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      {
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         MessageBox.Show("Error occurred when adding a page. Status: " + oGdPictureImaging.GetStat().ToString(), "Color Detection Example", MessageBoxButtons.OK, MessageBoxIcon.Error);
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         break;
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      }
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      oGdPictureImaging.ReleaseGdPictureImage(rasterPage);
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     }
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    }
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    else
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    {
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     MessageBox.Show("Error occurred when rendering the page. Status: " + oGdPicturePDF.GetStat().ToString(), "Color Detection Example", MessageBoxButtons.OK, MessageBoxIcon.Error);
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    }
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   }
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   oGdPictureImaging.TiffCloseMultiPageFile(tiffID);
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   oGdPictureImaging.ReleaseGdPictureImage(tiffID);
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}
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else
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{
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   MessageBox.Show("The file can't be opened. Status: " + oGdPicturePDF.GetStat().ToString(), "Color Detection Example", MessageBoxButtons.OK, MessageBoxIcon.Error);
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}
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oGdPicturePDF.Dispose();
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oGdPictureImaging.Dispose();