I try to implement GIMP's the Additional blending mode for layers in my application. I've found the formula:

E = min((M+I), 255)

I think, that if I blend colours with values (255, 127.5, 0) and (0, 127.5, 255) I will get (255, 255, 255) but in GIMP I see color with value (255.0, 176.0, 255.0).
Which formula GIMP uses to calculate the result color?
Where I can find complete formulas which GIMP uses to make blending? Here you can find my xcd file: https://yadi.sk/d/ndaO0sJRicsXVg


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