This is a project which could save additional infomation into a png file. This is a Java window program which create and build in Eclipse, so before you run this project, you need some fore step:
1, Prepare a Eclipse or other common IDE.
2, As this project use Swing components(just like JTextArea etc.) , So the WindowBuilder plugin is nessecery.(here's the link http://www.eclipse.org/windowbuilder/download.php)
3, Run the project
snapshot: