When I referred to "logarithmic domain", I'm not talking about a purely log/exp transfer function, but one that is "log like". Perhaps it is more accurate to say "non-linear domain"... but I hope you get the idea. :)
The sRGB transfer function is piecewise linear + exponential but can be closely approximated by a simple exponential with \gamma ~= 2.2 [1]. Either way, the encoding between linear and non-linear is generally referred to as "gamma correction", even when using a transfer function that is not a simple exponential.
[1] https://en.wikipedia.org/wiki/SRGB#The_forward_transformatio...