Sometimes it is easier to grasp the concepts of a language or library such as JavaFX by seeing it in action. I’ve put together a JavaFX image converter application. This JavaFX app allows you to drag GIF’s, JPEG’s, BMP’s, or PNG’s onto the ImageView and then convert them and save them quickly as any of the other formats mentioned above.
This JavaFX app is a double-clickable JAR file. That means that if you want to run it from the JAR file, just make sure you have Java installed and double-click the JavaFX JAR named image-converter.jar.