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> Ranges aside, how would you explain that  (0xA0, 0, 0) shows 
> up as in cyan
> color, whearas  (0xA0, 0x80, 0x80) is gray?

That's exactly what I'd expect from the default Decode array.
> 
> About the Decode array: where would I get that? TIFFs I have 
> been working
> are produced by Photoshop and don't seem to have that 
> information embedded.

It's a PDF thing, not a TIFF thing.  If you are making the PDF, you
must encode values so that the Decode value will produce the
right colorant values. 

So, read about Decode in the PDF Reference - you have been lucky
to escape it so far...

Aandi


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