Adjusting Gamma, Offset, and Gain

You can adjust the gamma, gain, and offset for the entire image (RGB), or alter them for one or more channels.

Gamma

Lightens or darkens midtones. This does not affect pure black and white.

Gain

Maintains the shadows at their current levels, but progresses much faster towards highlights (positive gain), or much faster towards the shadows (negative gain), reducing the number of colors in the image.

Offset

Uniformly lightens or darkens images. Shadows are raised and highlights are raised. When the mapped location of any value is off the chart, either too dark or too light, it is "clipped".

If you are changing both the gamma and offset in the same image (for one, two, or all three curves), combustion performs the gamma change first.