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This is the mystery modified image. (2/2)
The original image is a screen capture from a video which I took myself, using the built-in function of my player(Media Player Classic), not PrintScreen. The video was an OP of a VN game, so I'm pretty sure I have the original video [That is, there's no higher-quality video floating around]....
The modified image I got off konachan.
I know it doesn't seem like a big difference, but when I resize the two images, it becomes MUCH more noticable.