It is the article of pre-integrated skin BRDF texture.
This BRDF Texture is made in linear colorspace.
This Texture is made in gamma colorspace
(It process gamma correct after texture generation).
linear colorspace texture(left) uncheck sRGB. It is linear texture.
gamma colorspace texture(right) check sRGB.
And I draw texture. (Unity rendering setting set linear colorspace)
It looks similar. but,
Left zoom in. It has color banding.
So, If you wanna high quality skin rendering, use gamma space BRDF texture.
>>> download: 1024×1024 Size Skin BRDF Texture on Gamma Colorspace
SIGGRAPH 2011- Pre-Integrated Skin Shading