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Publishing a message makes a copy and sends it over the network. ROS doesn't let you send pointers between nodes, because those nodes aren't running in the same memory space, and may not even be running on the same machine.

If you don't need to publish this data structure, and just want to pass it around within your own code, you can just declare a class or a struct containing the pointers, like:

struct ImageWithCameraInfo {
    sensor_msgs::ImageConstPtr image;
    sensor_msgs::CameraInfoConstPtr info;
};