TiffHelper.cs

using System;
using System.Drawing;
using System.Drawing.Imaging;
using System.IO;

namespace MergeTiff.NET
{
    /// <summary>
    /// A small helper class to handle TIFF files
    /// </summary>
    public static class TiffHelper
    {
        /// <summary>
        /// Merges multiple TIFF files (including multipage TIFFs) into a single multipage TIFF file.
        /// </summary>
        public static byte[] MergeTiff(params byte[][] tiffFiles)
        {
            byte[] tiffMerge = null;
            using (var msMerge = new MemoryStream())
            {
                //get the codec for tiff files
                ImageCodecInfo ici = null;
                foreach (ImageCodecInfo i in ImageCodecInfo.GetImageEncoders())
                    if (i.MimeType == "image/tiff")
                        ici = i;

                Encoder enc = Encoder.SaveFlag;
                EncoderParameters ep = new EncoderParameters(1);

                Bitmap pages = null;
                int frame = 0;

                foreach (var tiffFile in tiffFiles)
                {
                    using (var imageStream = new MemoryStream(tiffFile))
                    {
                        using (Image tiffImage = Image.FromStream(imageStream))
                        {
                            foreach (Guid guid in tiffImage.FrameDimensionsList)
                            {
                                //create the frame dimension 
                                FrameDimension dimension = new FrameDimension(guid);
                                //Gets the total number of frames in the .tiff file 
                                int noOfPages = tiffImage.GetFrameCount(dimension);

                                for (int index = 0; index < noOfPages; index++)
                                {
                                    FrameDimension currentFrame = new FrameDimension(guid);
                                    tiffImage.SelectActiveFrame(currentFrame, index);
                                    using (MemoryStream tempImg = new MemoryStream())
                                    {
                                        tiffImage.Save(tempImg, ImageFormat.Tiff);
                                        {
                                            if (frame == 0)
                                            {
                                                //save the first frame
                                                pages = (Bitmap)Image.FromStream(tempImg);
                                                ep.Param[0] = new EncoderParameter(enc, (long)EncoderValue.MultiFrame);
                                                pages.Save(msMerge, ici, ep);
                                            }
                                            else
                                            {
                                                //save the intermediate frames
                                                ep.Param[0] = new EncoderParameter(enc, (long)EncoderValue.FrameDimensionPage);
                                                pages.SaveAdd((Bitmap)Image.FromStream(tempImg), ep);
                                            }
                                        }
                                        frame++;
                                    }
                                }
                            }
                        }
                    }
                }
                if (frame >0)
                {
                    //flush and close.
                    ep.Param[0] = new EncoderParameter(enc, (long)EncoderValue.Flush);
                    pages.SaveAdd(ep);
                }

                msMerge.Position = 0;
                tiffMerge = msMerge.ToArray();
            }
            return tiffMerge;
        }
    }
}