[Gimp-developer] how to realize these operations by using computer program language?

[zhang chi]

I want to realize these operations by using computer program language:
http://www.gimptalk.com/forum/topic/My-First-Tutorial-Blending-Images-In-Gimp-106-1.html

I select gimp software,because I think gimp is open source code,but I found
there are too many code to read,I can't find what I need.

So where to find these codes? or please give some clue about the operation
process.

thank you very much
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