将多个多页 tiff 图像合并为单个 tiff C#

在我的场景中，我有 3 个或更多多页 tiff 图像，我需要将它们合并为单个 tiff 图像。

下面是我尝试过的代码。它合并到单个 tiff 图像中，但仅与所有 tiff 图像的第一页合并。

private static void MergeTiff(string[] sourceFiles)
{
    string[] sa = sourceFiles;
    //get the codec for tiff files
    ImageCodecInfo info = null;
    foreach (ImageCodecInfo ice in ImageCodecInfo.GetImageEncoders())
        if (ice.MimeType == "image/tiff")
            info = ice;

    //use the save encoder
    Encoder enc = Encoder.SaveFlag;

    EncoderParameters ep = new EncoderParameters(1);
    ep.Param[0] = new EncoderParameter(enc, (long)EncoderValue.MultiFrame);

    Bitmap pages = null;

    int frame = 0;

    foreach (string s in sa)
    {
        if (frame == 0)
        {
            MemoryStream ms = new MemoryStream(File.ReadAllBytes(Path.Combine(Environment.CurrentDirectory, @"C:\Data_Warehouse\SVNRepository\CD.BNS.W5555.LT45555C.D180306.T113850.Z0101\", s)));
            pages = (Bitmap)Image.FromStream(ms);

            var appDataPath = @"C:\Data_Warehouse\SVNRepository\Tiffiles\";
            var filePath = Path.Combine(appDataPath, Path.GetRandomFileName() + ".tif");

            //save the first frame
            pages.Save(filePath, info, ep);
        }
        else
        {
            //save the intermediate frames
            ep.Param[0] = new EncoderParameter(enc, (long)EncoderValue.FrameDimensionPage);

            try
            {
                MemoryStream mss = new MemoryStream(File.ReadAllBytes(Path.Combine(Environment.CurrentDirectory, @"C:\Data_Warehouse\SVNRepository\CD.BNS.W5555.LT45555C.D180306.T113850.Z0101\", s)));
                Bitmap bm = (Bitmap)Image.FromStream(mss);
                pages.SaveAdd(bm, ep);
            }
            catch (Exception e)
            {
                //LogError(e, s);
            }
        }

        if (frame == sa.Length - 1)
        {
            //flush and close.
            ep.Param[0] = new EncoderParameter(enc, (long)EncoderValue.Flush);
            pages.SaveAdd(ep);

        }

        frame++;
    }

}

我需要将多个 tiff 图像与每个 tiff 图像的所有页面连接起来。请指教！

Thanks

EDIT：从下面的答案更新

if (frame == 0)
            {
                MemoryStream ms = new MemoryStream(File.ReadAllBytes(Path.Combine(Environment.CurrentDirectory, @"C:\OMTest\Working\", s)));
                pages = (Bitmap)Image.FromStream(ms);

                var appDataPath = @"C:\Data_Warehouse\SVNRepository\Tiffiles\";
                var filePath = Path.Combine(appDataPath, Path.GetRandomFileName() + ".tif");

                //save the first frame
                pages.Save(filePath, info, ep);

                //Save the second frame if any
                int frameCount1 = pages.GetFrameCount(FrameDimension.Page);
                if (frameCount1 > 1)
                {
                    for (int i = 1; i < frameCount1; i++)
                    {
                        ep.Param[0] = new EncoderParameter(enc, (long)EncoderValue.FrameDimensionPage);
                        pages.SelectActiveFrame(FrameDimension.Page, i);
                        pages.SaveAdd(pages, ep);
                    }
                }
            }
            else
            {
                //save the intermediate frames
                ep.Param[0] = new EncoderParameter(enc, (long)EncoderValue.FrameDimensionPage);
                try
                {
                    MemoryStream mss = new MemoryStream(File.ReadAllBytes(Path.Combine(Environment.CurrentDirectory, @"C:\OMTest\Working\", s)));
                    Bitmap bm = (Bitmap)Image.FromStream(mss);
                    int frameCount = bm.GetFrameCount(FrameDimension.Page);
                    for (int i = 0; i < frameCount; i++)
                    {
                        bm.SelectActiveFrame(FrameDimension.Page, i);
                        pages.SaveAdd(bm, ep);
                    }
                }
                catch (Exception e)
                {
                    //LogError(e, s);
                }
            }

你需要选择活动帧 https://learn.microsoft.com/en-us/dotnet/api/system.drawing.image.selectactiveframe?view=netframework-4.7.2以确保您获取 TIFF 上的所有页面。在你的代码中你需要获取帧数 https://learn.microsoft.com/en-us/dotnet/api/system.drawing.image.getframecount?view=netframework-4.7.2并循环遍历这些。

else 块中的代码可能如下所示：

MemoryStream mss = new MemoryStream(File.ReadAllBytes(Path.Combine(Environment.CurrentDirectory, @"C:\Data_Warehouse\SVNRepository\CD.BNS.W5555.LT45555C.D180306.T113850.Z0101\", s)));
Bitmap bm = (Bitmap)Image.FromStream(mss);
int frameCount = bm.GetFrameCount(FrameDimension.Page);
for(int i=0;i<frameCount;i++){
    bm.SelectActiveFrame(FrameDimension.Page, i);
    pages.SaveAdd(bm, ep);
}

你可能需要调整它，因为我还没有测试过。