CUDA NPP Library - Image Gamma Correction

I am looking at the gamma correction functionality in the CUDA NPP Library here: NVIDIA 2D Image And Signal Performance Primitives (NPP): Color Gamma Correction. I am wondering what gamma value is used for the forward gamma correction and what is the difference here between forward and inverse gamma correction?

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Hi, have the same question. Also I am wondering whether one can look up the source code.