Then click the "Delete" button on your keyboard or directly drag and drop the photo into the Trash.
Way2: i Photo Duplicate Annihilator is a small but useful application which can scan pictures in i Photo library and tag all the duplicate copies that it find by putting the Duplicate in the comments.
You will see all of your photo libraries or events.
STEP2: Click a photo library that you want to merge with another.
\r\n\r\n STEP1: Launch i Photo, click \"Events\" within the pane on the left side of the i Photo window.