The latest update to the official Google Photos app will give people the freedom to edit as much as they want to without having to worry about permanently altering the original images.
According to the Photos Google+ page:
Sometimes it takes multiple edits to get a photo just right – or you change your mind and decide the original was perfect just the way it was. With today's update for Android, editing is now fully reversible and non-destructive. So you can save your edits or save a new copy of the photo – either way, the original photo will remain untouched.
You can check out the new version that's rolling out today in the Google Play Store.