Screenshot doesn't have the correct colours
It's a photo taken by a phone camera. The window on the left is Shotwell, while the window on the right is a screenshot of Shotwell, taken with GNOME Shell on Wayland, being viewed in GNOME Photos. Notice how the colours of the icons in the sidebar and the pool table are different.
I have Intel Sandybridge graphics and:
[rishi@kolache ~]$ rpm -q mutter gnome-shell mutter-3.26.2-2.fc27.x86_64 gnome-shell-3.26.2-4.fc27.x86_64