>1 alpha in 16bit TIFF

I'm looking to use ImageMagick for generating JPEG previews
of assets
going into our digital asset management system. I've used it
in the past
for other applications, but I'm up against a file format
problem - one
particular set of TIFF variants are giving me garbled
results in
ImageMagick. Using my battery of sample files, I've
identified this
combination of TIFF features as being problematic:

16 bit RGB TIFF, with *more* than 4 channels total (for
instance, RGB + 2
alpha channels)
16 bit CMYK TIFF, with *more* than 5 channels total (for
instance, CMYK +
2 alpha channels)

Everything works fine with 8bit TIFFs with n channels, or
with 16bit as
long as we have only 0 or 1 additional channels.

For the purposes of this process I don't care at all about
the alpha
channels - I just need to pull a decent thumbnail/preview
for these files.

Any suggestions on ImageMagick options to get this to work?
Can post
samples if its helpful.

Thanks!

Roger Howard

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