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it's also worth mentioning that JPEG was designed for photographs, where there's a very high likelihood that each pixel of an image will be a different colour to those immediately next to it. Because of this, JPEG not only has higher file sizes for text and 2d graphics/pixel art than PNG and especially a compressed SVG (which would far and away be the best method of representing the mario image - it's close to the same "tile" thing but transferrable and well supported), but it also results in artifacts and lower quality of the image.