Gamma

The edit box defaults to 2.2, the conventional adjustment for linear raw recordings. The value can be changed in the edit box; hit the Enter key to apply it. If you're working a raw image, this will usually be the first tool you add, to stretch out the linear-recorded data to a range more approximating the behavior of human vision. Watching the histogram as you do this is most instructive.

Note: This tool is deprecated, in favor of the gamma operator in the tone tool. Images open with File->Open->Source that have gamma as a tool will have it automatically converted to tone:gamma,...

Properties: See tool.gamma.* in Configuration Properties