Using LibTiff from C# (to access tiled TIFF images)

Question

I\'d like to use LibTiff to access very large TIFF files. I need functions like multiple pages and tiles, and so LibTiff seems to be the right way to go. Can anyone help me

Answer 1

WIC provides support for very large image files. There's a nice wrapper for it in the .NET framework: TiffBitmapDecoder.

Answer 2

My initial solution was to use a C#.NET wrapper for the LibTIFF DLL. I have found it on libtiff ftp. It seems to contain all important methods of the LIBTiff library. It keeps memory in unmanaged LibTIFF memory; this means that the C# code needs to be aware of this and copy data when it needs to be processed in safe code.

My 'tile reading code' to test it read like

if (LibTIFF.IsTiled(tiff))
{
    if (LibTIFF.GetField(tiff, (int)TIFFTags.TIFFTAG_TILEWIDTH, out tileWidth) &&
        LibTIFF.GetField(tiff, (int)TIFFTags.TIFFTAG_TILELENGTH, out tileLength))
    {
        uint tiles = 0;
        IntPtr pTile = LibTIFF._malloc((int)(tileLength*tileWidth*bitsPerSample/2));
        for (uint y = 0; y < imageLength; y += tileLength)
        {
            for (uint x = 0; x < imageWidth; x += tileWidth)
            {
                LibTIFF.ReadTile(tiff, pTile, x, y, 0, 0);
                tiles++;
            }
        }                        
        LibTIFF._free(pTile);   
    }
}

I'll go for the .NET port of LibTIFF though, but this solution may be the right one for other people, so I leave it on StackOverflow.

Answer 3

You can try our LibTiff.Net. It is free and open source version of LibTiff written using managed C#. API of our implementation kept very similar to original one's.

https://bitmiracle.com/libtiff/

We've just released it, so there may be bugs. But full source code comes with a number of test, so most obvious bugs should be fixed.