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I believe dynamic_reconfigure can adjust kinect driver parameters (or at least downsamples pre-publication, avoiding CPU overhead).

Use the GUI: rosrun dynamic_reconfigure reconfigure_gui
Change params in a launch script: e.g., <node pkg="dynamic_reconfigure" type="dynparam" name="resetter" args="set /openni_node image_mode 8" />

Note that you can't re-set params for openni_node if it has an subscriber...

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