Restoring samsung s7 edge negative photos back to normal

[AC Question]

I took a bunch of photos on my Samsung s7 edge phone in its selfie mode and later found out that the pictures were in a negative. They looked fine from the preview screen, but once I clicked on the photos they all show as negative. Is there a way to restore those pictures back to normal?

 

[B. Diddy]

Welcome to Android Central! If you copy the photo files to your computer and view them there, do they still look like negatives? Does the gallery app (or some other photo editor app) have a Negative option you can use on the photos to see if that reverts them back to normal?