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The image_transport package is designed to take care of the decompression / compression for you automatically. If you subscribe to the base image topic as shown below and give it the hint to check for a compressed version then it will automatically find and decompress the compressed image topic for you.

image_transport::ImageTransport it(n);
itSub = it.subscribe("<base_topic>",1,callbackFn,image_transport::TransportHints("compressed"));

This way it will work even if there isn't a compressed version of the topic, but will automatically extract the compressed topic if it exists.