I doubt if you can but maybe someone will prove me wrong! It's like taking a picture with a cheap camera and then wanting to improve the sharpness of the print. If the information isn't there on the original then it's not possible to regenerate it.
OnePlus 5 review
See the work of famous artists playing with toys
iPad Pro 10.5in (2017) review
Comment faire une capture d’écran sur un Mac ?