what algorithm is used in Ctrl-K?

["zhang chi" <zhangchipr@xxxxxxxxx>]

http://www.gimptalk.com/forum/topic/My-First-Tutorial-Blending-Images-In-Gimp-106-1.html

in this tut, after feather,C-i,and C-K is used, but what algorithm is used when using Ctrl-k ?

thank you
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