Samsung l55 User Manual (en)

Special Effect : Composite shooting
ƃChanging a part of composite shot before taking the last shot
Before taking the last composite shot, you can change a part of composite shot.
1. During the composite shots, press the +/- button.
2. A previous image will be deleted and new frame will display. 
If there is an image taken before, press the +/- button again and a previous image will be
deleted again.
3. Press the shutter button to capture a new image.
Pressing the +/- button
[Before taking the 3rd shot]
[Moving backward to the 2nd shot]