On Fri, 2012-07-13 at 19:57 +0200, Hans Hagen wrote:
> in theory yes but in practice no
> 
> \starttext
> 
> % quick and dirty test:
> 
> \setobject{test}{1}\hbox{\externalfigure[mill.png]} % gets object 15
> 
> \startluacode
>      lpdf.addtopageattributes("Thumb",lpdf.reference(15))
> \stopluacode
> 
> \input tufte
> 
> \getobject{test}{1}
> 
> \stoptext
> 
> no viewer seems to do something with it

Still, that's quite interesting that in theory it can be done. It's not
your fault afterall if the thumbnailers don't implement it.

-- 
Kip Warner -- Software Engineer
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http://www.thevertigo.com