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The ROS image message isn't a jpeg as a byte array; it's just values as a byte array. There's no compression done automatically (and therefore ROSJava will see just plain data, not compressed data).

Why are you using ROSJava to save the image? If all you want to do is turn Image messages into files, you can do that easily with cv_bridge in python or c++.

This sounds like an XY Problem. What's X?

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