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Convert ROS Image to CompressedImage(png)

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I am trying to convert a rosbag with raw images to another rosbag containing compressed images using cv2 bridge: def compress_to_png(msg): bridge = CvBridge() img = bridge.imgmsg_to_cv2(msg, desired_encoding="passthrough") ret_val, image_buffer = cv2.imencode(".png", img) compressed_msg = CompressedImage() compressed_msg.header = msg.header compressed_msg.data = image_buffer.tostring() compressed_msg.format = "png" return compressed_msg However, the new rosbag seems to be having issues when I play it with rqt_bag. More specifically, it throws the below message: "Can't convert image: image has wrong mode" This method however works when I convert to jpeg. Only png conversion seems to be running into issues. Any thoughts ?

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