This is a handy yet simple tutorial that demonstrates the use of cloning.
From the articles intro:
This tutorial will teach you how to remove those annyoing powerlines while leaving the original image un-touched. I have to say I find myself using this removal technique on many landscape images, very usefull indeed. This techiniaue takes about 10 minutes to completey remove any traces of powerlines, but again it depends on the amount of lines
I am no longer sure where you are getting your information, but good topic.
I needs to spend some time finding out more or working out more.
Thanks for wonderful info I was looking for this information for my mission.