2010.05.11 15:58 "Re: [Tiff] Tiff with varying bit depths", by Bob Friesenhahn
Obviously, the library does not support this, but what are my options if I need to read this file? I'm not too keen to write a tiff-parser myself, unless I really really have to - and - I afraid - I really really have to read this file in one way or another.
I would focus on updating the tags in the file so that the image looks like a normal single-component 16-bit min-is-black grayscale image. Then libtiff should be able to open it, and you can extract the actual components yourself.
GraphicsMagick Maintainer, http://www.GraphicsMagick.org/