Is "0" the uncorrected setting for "Full Screen Gamma Correction"?

[Anhe]

Under "Display Settings" there's an option titled "Full Screen Gamma Correction". The setting defaults to "50". Is "0" the uncorrected or intended look for the game and any setting above "0" a compensated gamma setting? I am asking the question in regards to taking screenshots or capturing game footage to share with others, where my display isn't a factor.