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Basically you run the nodelet and remap the input topics. The resize parameters you can change via dynamic reconfigure and/or provide initial values as cmdline parameters.

E.g. to downscale the /stereo/left/image_rect to half the size:

rosrun nodelet nodelet standalone image_proc/resize image:=/stereo/left/image_rect camera_info:=/stereo/left/camera_info _scale_width:=0.5 _scale_height:=0.5

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