You may
use the Rubber Stamp tool to correct any flaws in the image. This is one
of most useful tools as it clones an area of the image and deposits it over
the flaws, dirt, oil drops, etc. It can also be used to fill blank space
on an image when making a composite plate. Hold down the Option key and
click with the mouse to choose an area to be cloned. Then proceed to stamp
out the flaws (click with the mouse). 