[Gimp-user] Highlighting

[David Tuff via gimp-user-list]

Produced this image, the highlighting between the "chook" and the sky using 
gimp, but can't remeber how I did it. Can anyone give me the answer?
Link below gets the image.
http://quinco.net.au/images/chooka.jpg 
(https://link.getmailspring.com/link/1529968177.local-966d2b13-8102-v1.2.2-96fb3...@getmailspring.com/0?redirect=http%3A%2F%2Fquinco.net.au%2Fimages%2Fchooka.jpg&recipient=Z2ltcC11c2VyLWxpc3RAZ25vbWUub3Jn)
Regards,
David
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