From the Instagram engineering blog: Bringing Wide Color to Instagram:
"Last September, Apple announced the iPhone 7 and 7 Plus, which include cameras that capture a greater range of colors than previous models, and screens that can display that wider color range. We’ve just finished updating Instagram to support wide color, and since we’re one of the first major apps to do so, I wanted to share the process of converting the app to help any others doing the conversion."
They have a great canary image for testing wide color in their apps.
Acorn handles wide color of course (and I think it might have been the first image editor on the Mac to do so). So you can replace "Photoshop" with "Acorn" anytime you come across it in the article.