Danbooru-based image board with a specialization in high-quality images.
cap da_capo_(series) da_capo_iii katsuragi_himeno seifuku tanihara_natsuki wallpaper

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It's a screen cap, that should explain the compression artifacts.
Is there a reason why screen captures can never produce a perfect copy of the original?
Depends where it is from.
Just because uncompressed video is too big (think about 1080p bmp x 24 x time).
Eeeyup, and there's no viable lossless video encoding either.