Different Image Transports
Image Transport is used to subscribe to images, which provides transparent support for transporting images in low-bandwidth compressed formats. By using different image transports, you can achieve faster image transportation with possibly a higher frame rate.
To use another image transport, install the image transport on the machine publishing the image, and on the machine running RQt Image Overlay, if they differ.
Refresh the image topics in RQt Image Overlay, and you should see alternative transports available, as shown in the image below:
Tip
By using a transport such as compressed, you may get better visualization.