What's the difference between "Offset | Gamma | Gain"

Although there are ranges you can set between Shadows, Midtones, and Highlights, Offset, gamma, Gain are traditionally fairly simple math to the overall image.  They are a main part of primary color correction.  Meaning in your Overall tab you can and should use Offset Gamma Gain as much as possible to get your image where you want it before you start messing with other things.

The old school math for them is offset is just addition, Gain is just multiplication, and gamma is a power function curve.  Although rebalancing offset and gain with each other can be a hassle so it seems like some color systems like Resolve are range mapping the lows and high bewteen your input video and your output video and having gamma still a be a power function in there.

But using those controls you can set the levels, the amount of contrast or lack of, and bias all kind of color casts for wildly different effects.  For example, pushing the offset very blue but then going opposite with the gamma to rebalance the mids can give your blaks that instamatic blue/black look that everyone is crazy about.  Classic gain (which is multiplication) as it's pushed to a specific color is the same as putting a colored filter over the camera when you were shooting. 

Personally I don't like using ranges to color with (shadows/mids/highlights), I prefer using the different math properties of offset/gamma/gain under a "master" or "Overall" mode.

I have the same question.

Back to Google I go.