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Also the comparison to a PNG instead of a JPEG was a bit disingenuous since PNG is a lossless codec. I understand it was done to sound impressive but if you compare lossless PNG to a codec that just reuses the same frame and uses a lossy codec on top, it's not surprising the video will be smaller.

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I'm not convinced.

For an article talking about the magic of compression, comparing to uncompressed png makes a lot more sense than, say, starting your comparisons to something that's already compressed like jpeg.

That png is a much closer pedagogocal relation to the previously discussed "3D array of pixels, 2 in space and one in time" that he's building on.

PNG is compressed, just losslessly. A bitmap image is an uncompressed image format (which is why you don't see them around much anymore).

But given that the PNG comparison was shown before an extensive discussion on how lossy encryption works by discarding detail that is hard to perceive it's entirely appropriate as a starting point for this article.

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