All frames are scaled to the same long side (the smallest long side, at most 768...
https://bild.halowerk.com/v1/burst-best-pickOverview
All frames are scaled to the same long side (the smallest long side, at most 768 px) so that measures are comparable. Sharpness is the mean noise-corrected Laplacian variance (variance − 20·σ², σ by Immerkær 1996) of the 4 sharpest of 4×4 tiles, so the subject counts more than a blurred background; it is scored relative to the sharpest frame.