Garbage Collection? How do I remove/delete image or objects that was create by display.newXXX?

Getting Started Newbie Questions
#1

HI,
For example, let’s say I have to create an image (display.newImage) on every touch event(including on 'move).
And after 3 seconds I need to remove the image what do I do to completed kill/remove this image?

Thanks for your help. [import]uid: 32102 topic_id: 5996 reply_id: 305996[/import]

#2

To create an image, use background=display.newImage(“test.png”)

To delete it, use background:removeSelf()
[import]uid: 6084 topic_id: 5996 reply_id: 20536[/import]