I think you just miss the"Glossary" at the right side of the linked page
Anyway David Gowen explained well

i just want add another link that may be useful
Pegtop delphi
I want to write a plug-in for gimp 2.4 that will emulate the PS "Vivid
Light" blending mode.  I've found some formulas for the PS modes, but I
don't know what the variables are and how they would map to gimp
function use.  The formulas are at:


Basically, I need a guide to 'C', 'A' and 'B' for the complete idiot. 
Any help would be greatly appreciated.



Alchemie Foto\grafiche
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