That is what is at the heart of my question: is there such a thing as TIFF Group 6 compression? I've never heard of TIFF Group 6, but a customer recently asked one of our salesmen whether our software supports TIFF Group 6. I'm asking whether anyone has ever heard of TIFF Group 6, what they know about it, and whether they can point me to more info ...

Are you sure its tiff group 6? You can use this dotimage function to get the compression used for an image. We use tiff but only group 4. [Visual Basic]Dim comp As Integer = Convert.ToInt32(TiffDecoder.GetTiffTag(259, FileName, 0).Data)Select Case comp     Case 1          ' ...

In the TiffEncoder, there is a TiffTags property that you where I believe you can add your own custom tags before you save the image. I hope this helps.