Eraser Bucket sub-tool can delete the color of the tapped area. This is useful when you want to make the background transparent or erase unneeded place.
Tap ②Bucket from the ①Tool Selection window .
Switch to ① Eraser Bucket sub-tool .
Tap ①Unneeded place of the photo to delete the color.
You can cut out only the rose by making the background of the photo transparent.