Is there a way to get "Display P3" screenshots from the simulator? The difference in the greens (see comparison: https://twitter.com/ortwingentz/status/939226520710795264) is terrible!
But having to do 55 screenshots from the device instead is much more work.
It looks like the Simulator saves images with the "sRGB IEC61966-2.1" profile. When I assign the "Apple RGB" profile to it in Photoshop ("Edit" > "Assign Profile…"), the colors on the screen match the displayed simulator window and any screenshots created on the device (in this case an iPhone X).
Not sure what's wrong exactly but to me this looks like a bug (rdar 35994235).