LowPass Skin Smoothing

[swakez]

Hi, thanks for creating this awesome repository.

I am a newbie at writing shader string, so can you please suggest me a way to target the low-frequency areas in the image just like you are creating the high pass filter in the following way, to target the high frequencies areas of the image

highpass.rgb = image.rgb - gaussianBlurredImage.rgb + vec3(0.5,0.5,0.5)

Any help would be highly appreciated. Thanks