Abrir imagen en raw

Opening an image in Camera Raw cannot lower its quality. If you are comparing it with perhaps what you saw in the camera monitor, that would have been the JPEG preview because the camera cannot display the raw data. The JPEG data would have been processed in the camera. The raw data will not have been processed, and that is what you must do using Camera Raw. It is your job, using Camera Raw, to make the raw data look the way it should look.