ROS2 resize and rectify always subscribe to the raw image

[clydemcqueen]

In ROS2 RectifyNode::subscribeToCamera calls image_transport::create_camera_subscription, which doesn't get the value of the image_transport parameter, so it always subscribes to the raw image on the base topic.

In ROS1 RectifyNodelet::connectCb calls image_transport::subscribeCamera and passes in a TransportHint. The TransportHint object will get the value of the image_transport parameter, allowing users to choose a different transport at runtime.

image_pipeline/image_proc/src/nodelets/rectify.cpp

Line 108 in 71d537a

image_transport::TransportHints hints("raw", ros::TransportHints(), getPrivateNodeHandle());

Same goes for ResizeNode.

I'm not sure if the fix should land in image_transport or image_proc.

Thanks.

[mikeferguson]

Added to meta ticket for image_transport updates: #854