Any best practices to record high quality images in rosbag?

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Hi, I am trying to record images (RGB+depth) into a rosbag using ASUS Xtion Pro Live. I followed this tutorial on what topics to record. But it did not mention anything about the quality aspect. For example does rosbag has options (like ffmpeg) to record the images/video as high or low quality? Or is it the openni_camera or openni_launch that takes care of this aspect? For example ASUS has depth resolution 640×480 @ 30 fps, 320×240 @ 60 fps and color 1280×1024 @ 30 fps. How do I select the quality options in ROS?

Thanks in advance, Krish