Why Faces Get Lost First
In most treasured old photos, the faces are the smallest important thing in the frame. A group portrait from a film camera might give each face only a few hundred pixels, and every generation of copying, scanning, and compressing chips away at exactly that region. Printing softens it, time fades it, and early digital cameras added noise on top.
Generic sharpening cannot repair this, because sharpening only exaggerates edges that still exist. A face that has collapsed into a smudge has no edges left to exaggerate. What it needs is reconstruction: a system that knows what human faces look like and can rebuild plausible eyes, skin, and hair that stay faithful to the person.
That is what a face restoration network does, and it is why the results look dramatic compared to any filter. The model brings knowledge of faces in general and applies it to the specific face in your photo.