P20 Pro Imported photos become desaturated when viewed in full screen

[Android Central Question]

Hi all,
I am hoping someone can help.
I have the P20 Pro and it's fantastic, however when I import a photo or download a photo from my google drive, onto the phone, the image becomes desaturated.

Example, the thumbnail in gallery appears as normal, once I view the photo immediately the colours desaturate.

Please help!