I doubt xnview and windows' image viewer allow to correct the perspective but maybe I'm wrong ? I'd also be surprised if they allowed to change the white balan

I doubt xnview and windows' image viewer allow to correct the perspective but maybe I'm wrong ? I'd also be surprised if they allowed to change the white balance or do color curves - especially when you look at the amount of super powerful filters come with GMIC, which itself comes with Krita. They also most certainly don't have a "Repair" tool like Krita does (https://streamable.com/p5dd1k https://streamable.com/p5dd1k).