Invert color for Post Processing Stack v2 does not work correctly in Linear color space

Hello,

I wrote invert color effect for Post Post Processing Stack v2 with reference to https://github.com/Unity-Technologies/PostProcessing/wiki/Writing-Custom-Effects.
It works fine in Gamma Color Space, but gets brighter than the correct result in Linear Color Space.



Are there any good ways to get correct result in Linear Color Space?

Thanks!