Why not just try it? ;) I'm not sure what you mean by that.

I have tried to subclass it, but it gives me an error. Something about GreenfootImage being an abstract class. By implementing I mean writing this: public class MyImage implements GreenfootImage instead of: public class MyImage extends GreenfootImage

Oh never mind.. I don't get why I couldn't make it work last time I tried. I ended up writing the following and it works fine. public class MyImage extends GreenfootImage { public MyImage(int width, int height) { super(width, height); } }