Thanks, that did the trick. One thing I'm still having trouble with is 
getting transports other than raw to work with 
image_transport::SubscriberFilter. If I pass 
image_transport::TransportHints th(transport) to 
image_transport::SubscriberFilter, where transport is "compressed" or 
"theora", I never seem to get any data. rxgraph -t shows that my node is 
connected to my image publisher on the right topic, but the callback 
never gets called.

Thanks,
-Dan

On 3/11/10 5:11 PM, Patrick Mihelich wrote:
> On Thu, Mar 11, 2010 at 2:55 PM, Dan Lazewatsky 
> <lazewatskyd@cse.wustl.edu <mailto:lazewatskyd@cse.wustl.edu>> wrote:
>
>     On a related note, is there a way to use TimeSynchronizer with
>     image_transport rather than subscribing to the image directly?
>
>
> Use image_transport::SubscriberFilter 
> <http://www.ros.org/doc/api/image_transport/html/classimage__transport_1_1SubscriberFilter.html> 
> as a drop-in replacement for message_filters::Subscriber. It uses an 
> image_transport subscriber under the hood.
>
> Cheers,
> Patrick
>
>
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