Clone Brush
The Clone Brush tool copies the exact contents of one area of an image into another region of the image or a second image. The clone brush paints the copied colours into the new area by simulating an artist's paintbrush.
To use this tool...
Click on the Cloner Brush button and point the cursor over the area to copy from. Click on the right mouse button to choose this area, then move the cursor to the area you want to copy to. Hold down the left mouse button and move the mouse to begin painting. You will see a set of crosshairs over the area that is being copied. To change the size, opacity or style of the clone brush, double click on the Cloner Brush button.