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When you use roslaunch and then make or save files/directories, those files and directories are created at $ROS_HOME, typically set to /home/user/.ros/. I suggest you look at that location for your images.

Additionally, you can specify a location to write files to using a parameter for your node. In your launch file you can set that parameter, and even have it be relative to a package. See, specifically the $(find pkg) syntax.