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Thank you for your patience. The compression formats for Euclid can be accessed in two ways.
They can be seen through the Configuration tab of the web UI as described in page 12 of the euclid-operating-guide-final.pdf. When you run a scenario, for example, 6DOF, and you view the Configurable Nodes in the Configuration tab, you will see /camera/color/image_raw/compressed, among others. Select /camera/color/image_raw/compressed and you will be able to edit the compression format, either jpeg or png, and the setting for each. You can also access this node as a rostopic in the command line. If you are familiar with ROS you can manipulate this node through the command line.