I though that when metering, cameras set the exposure so the average brightness in the scene is 18% gray or RGB(127,127,127). Then I read this article and am confused on this chart
http://www.xdcam-user.com/2014/08/exposing-and-using-slog2-on-the-sony-a7s-part-one-gamma-and-exposure/
What does this 32% for S-Log2 actually mean in plain English? Is it saying, when you meter off of an 18% gray card, which is RGB(127,127,127) in real life, then the camera should view it as RGB(82,82,82) because 32% of 255 is 82. Does this mean for a "normal" profile the middle gray 18% card would be 50%?
Any help would be appreciated.