http://img254.imageshack.us/img254/48/extcopyjx6.jpg (larger image)
Hope this helps, if it's too vague, just ask specific questions
extraction using the pen tool:
1) open the photo you want to use then open a new window
the same size and resolution with a transparent background.
2) copy the photo and paste it into the new window ( or drag it )
3) select the pen tool ( the top one in the option menu )
4) enlarge the photo in the new window to a comfortable size for working on
5) place the point of the pen tool on the edge of what you want outlined and
right click
6) move the pen point a short distance from the initial anchor point and click
again
NOTE: the closer together the anchor points, the smoother the path will
be.
7) when learning this method, do the process in smaller sections. Once you get
the hang of it
you can make the sections larger.
8) when you get to the point where you want to delete a section of background so
that you
can start another section, move the pen point out and away from the subject
and set an anchor point
then return to the initial anchor point and click on it to close the path.
9) click on Windows > Paths > Make Selection...a new dialog window will pop up.
Set the feathering to
'0' and check anti-aliased 'on'.
10) hit the delete command..The background inside the path will become
transparent.
11) continue by duplicating the process in a new area. Start by setting the
first anchor point in a cleared
area the place the second anchor point where you left off in the first
section.
Continue this process until you've cleared all the background around the
subject. Then erase everything outside that you didn't clear with paths.
You can now place the subject into another photo or save it in a file format
that preserves transparency
such as .png