How can I remove a background behind a persons photo?

[jclements]

Quick and Dirty so probably not the best that can be done.

This was only a 96dpi image and there was a lot of compression garbage such that the pixelization was larger than the hair strands. You'd have to "Cut out' the bad areas per Eggs method or bring the image into a photoediting programs and erase out some the transistion areas.

Hair2 is with KnockOut effect removed and saved as a bitmap.