Use LibTIff in C# to convert from one tiff format to another

Question

I have a Tiff using JPEG format the WPF / C# can not handle via TiffBitmapDecoder. Our clients use the file format and our current C++ and Java code handles it. I need to convert this to a format I can display using TiffBitmapDecoder or standard BitmapImage. It looks like the C# version of LibTiff is the way to go but I am not having any luck converting in code.

Here is my attempt - I always end up with corrupt files.

`

            Boolean doSystemLoad = false;
            Tiff tiff = null;

            try
            {
                tiff = Tiff.Open(file, "r");
            }
            catch (Exception e) // TIFF could not handle, let OS do it
            {
                doSystemLoad = true;
            }
            if (tiff != null)
            {
                width = Double.Parse(tiff.GetField(TiffTag.IMAGEWIDTH)[0].Value.ToString());
                height = Double.Parse(tiff.GetField(TiffTag.IMAGELENGTH)[0].Value.ToString());

                int bits = Int32.Parse(tiff.GetField(TiffTag.BITSPERSAMPLE)[0].Value.ToString());
                int samples = Int32.Parse(tiff.GetField(TiffTag.SAMPLESPERPIXEL)[0].Value.ToString());
                string compression = tiff.GetField(TiffTag.COMPRESSION)[0].Value.ToString();

                Console.WriteLine("Image is " + width + " x " + height + "   bits " + bits + " sample " + samples);
                Console.WriteLine("Compression " + compression);

                // We allow OS to load anything that is not JPEG compression
                doSystemLoad = compression.ToLower().IndexOf("jpeg") == -1;

                string tempFile = Path.GetTempFileName() + ".tiff";

                // Convert here then load converted via OS
                if (!doSystemLoad)
                {
                    Console.WriteLine(">> Attempting to convert... " + tempFile);
                    Console.WriteLine("  Scan line  " + tiff.ScanlineSize());

                    Tiff tiffOut = Tiff.Open(tempFile, "w");
                    tiffOut.SetField(TiffTag.IMAGEWIDTH, width);
                    tiffOut.SetField(TiffTag.IMAGELENGTH, height);
                    tiffOut.SetField(TiffTag.BITSPERSAMPLE, bits);
                    tiffOut.SetField(TiffTag.SAMPLESPERPIXEL, samples);
                    tiffOut.SetField(TiffTag.ROWSPERSTRIP, 1L);
                    tiffOut.SetField(TiffTag.COMPRESSION, Compression.NONE);
                    tiffOut.SetField(TiffTag.ORIENTATION, BitMiracle.LibTiff.Classic.Orientation.TOPLEFT);
                    tiffOut.SetField(TiffTag.FAXMODE, FaxMode.CLASSF);
                    tiffOut.SetField(TiffTag.GROUP3OPTIONS, 5);

                    tiffOut.SetField(TiffTag.PHOTOMETRIC, Photometric.RGB);

                    tiffOut.SetField(TiffTag.FILLORDER, FillOrder.MSB2LSB);
                    tiffOut.SetField(TiffTag.PLANARCONFIG, PlanarConfig.CONTIG);
                    tiffOut.SetField(TiffTag.RESOLUTIONUNIT, ResUnit.INCH);
                    tiffOut.SetField(TiffTag.XRESOLUTION, 100.0);
                    tiffOut.SetField(TiffTag.YRESOLUTION, 100.0);
                    tiffOut.SetField(TiffTag.SUBFILETYPE, FileType.PAGE);
                    tiffOut.SetField(TiffTag.PAGENUMBER, new object[] { 1, 1 });
                    tiffOut.SetField(TiffTag.PAGENAME, "Page 1");

                    Byte[] scanLine = new Byte[tiff.ScanlineSize() + 5000];
                    for (int row = 0; row < height; row++)
                    {
                        tiff.ReadScanline(scanLine, row);
                        tiffOut.WriteScanline(scanLine, row);
                    }
                    tiffOut.Dispose();
                }

                tiff.Dispose();

                Stream imageStreamSource = new FileStream(tempFile, FileMode.Open, FileAccess.Read, FileShare.Read);
                TiffBitmapDecoder decoder = new TiffBitmapDecoder(imageStreamSource, BitmapCreateOptions.PreservePixelFormat, BitmapCacheOption.Default);
                BitmapSource bitmapSource = decoder.Frames[0];

                width = bitmapSource.Width;
                height = bitmapSource.Height;

                imageMain.Width = width;
                imageMain.Height = height;
                imageMain.Source = bitmapSource;
            }

            if (doSystemLoad)
            {
                Stream imageStreamSource = new FileStream(file, FileMode.Open, FileAccess.Read, FileShare.Read);
                TiffBitmapDecoder decoder = new TiffBitmapDecoder(imageStreamSource, BitmapCreateOptions.PreservePixelFormat, BitmapCacheOption.Default);
                BitmapSource bitmapSource = decoder.Frames[0];

                width = bitmapSource.Width;
                height = bitmapSource.Height;

                imageMain.Width = width;
                imageMain.Height = height;
                imageMain.Source = bitmapSource;
            }

`

Answer 1

After direct contact with BitMiracle it turns out that neither LibTIff for C or LibTiff for .NET support the underlying file format so I am out of luck in this area. I will need to look into commercial package support which we hoped to avoid for our .NET product. We already use Acordex for Java and ImageGear for C++ so I believe we will use ImageGear for .NET. TIFF is just a bear to support and we have too many clients using this obscure file format to drop support for it.