Operating system: Linux-3.10.0-957.10.1.el7.x86_64-x86_64-with-centos-7.6.1810-Core 64 Bits
Graphics card: GeForce GTX 1070/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 418.56
Broken: version: 2.81 (sub 8), branch: master, commit date: 2019-09-05 10:52, hash: rBb6e7e173ecd9
Short description of error
The eyedropper gives incorrect color sample on picking from viewport or image viewer.
What's the point of eyedropper while shading, if you get a different color from what you see?
Since the feature is broken, I consider it a bug, not a feature request.
Exact steps for others to reproduce the error
Open the file attached.
The left image is a snapshot of the render from the right.
The bottom node is for sampling
Eyedrop from the render view or from the image and you'll get a different color from what you have in the top node.