http://wccftech.com/oreo-colorizer-app-pixel-2/

Android 8.0 Oreo on the Pixel 2 and Pixel 2 XL comes with default colour profile aims at sRGB to standardise colour display. It uses the colour management system to enable different colours to display whenever required.

As nifty as Google thought it to be but some users felt that it made the colours look dull, specifically on the Pixel 2 XL. Now, to normalise the colour display, Google has now launched a new app named Oreo Colorizer that enables users to force a wider colour gamut across all the app.