Code For Merging TIFFs in C#

mergetiff.cs

using System;
using System.Collections.Generic;
using System.Text;
using System.Drawing;
using System.IO;
using System.Drawing.Imaging;

private static void MergeTiffs(List<Bitmap> bmps, string filename)
{
  // Save first bitmap to memory as TIFF
  MemoryStream byteStream = new MemoryStream();
  bmps[0].Save(byteStream, ImageFormat.Tiff);
  Image tiff = Image.FromStream(byteStream);

  // Prepare encoders
  ImageCodecInfo encInfo = GetEncoderInfo("image/tiff");
  EncoderParameters encParams = new EncoderParameters(2);
  EncoderParameter param = new EncoderParameter(System.Drawing.Imaging.Encoder.Compression, (long)EncoderValue.CompressionCCITT4);
  encParams.Param[0] = param;
  param = new EncoderParameter(System.Drawing.Imaging.Encoder.SaveFlag, (long)EncoderValue.MultiFrame);
  encParams.Param[1] = param;

  // Save to file
  tiff.Save(filename, encInfo, encParams);
  for (int i = 1; i < bmps.Count; i++)
  {
    EncoderParameters encoderParams = new EncoderParameters(2);
    EncoderParameter SaveParam = new EncoderParameter(System.Drawing.Imaging.Encoder.SaveFlag, (long)EncoderValue.FrameDimensionPage);
    EncoderParameter CompParam = new EncoderParameter(System.Drawing.Imaging.Encoder.Compression, (long)EncoderValue.CompressionCCITT4);
    encoderParams.Param[0] = CompParam;
    encoderParams.Param[1] = SaveParam;
    bmps[i].Save(byteStream, ImageFormat.Tiff);
    tiff.SaveAdd(Image.FromStream(byteStream), encoderParams);
  }

  EncoderParameter FlushParam = new EncoderParameter(System.Drawing.Imaging.Encoder.SaveFlag, (long)EncoderValue.Flush);
  encParams = new EncoderParameters(1);
  encParams.Param[0] = FlushParam;
  tiff.SaveAdd(encParams);
}

private static ImageCodecInfo GetEncoderInfo(String mimeType)
{
  int j;
  ImageCodecInfo[] encoders;
  encoders = ImageCodecInfo.GetImageEncoders();

  for (j = 0; j < encoders.Length; ++j)
  {
    if (encoders[j].MimeType == mimeType)
      return encoders[j];
  }

  return null;
}