Question AR Foundation and HRD/Lightning issue or a feature?

Hi,
I am working on image processing project with AR Foundation. It's important for me to read accurate colors as much as possible and average them over time. However, I noticed that scene/camera gets different light when I rotate it.

On left, chair image comes as gray. The moment I turn the camera down (it's the same position), image get's more light and becomes kind of blue.

Is this something that can be configured from Unity camera/AR/lighting settings? I tried turning/tweaking HDR. I also experimented with auto focus.

I know that by using my OS phone camera, I am getting similar result and it's probably a camera feature but in this case, I want the same chair color regardless how I rotate the phone.

 

Anyone?

 

Wild guess.
I would say that your camera (real camera) is using some kind of auto exposure system.
Or maybe it is in unity ? But still it looks like exposure problem.