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Faking a JPEG

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291 points todsacerdoti | 4 comments | 11 Jul 25 22:57 UTC | HN request time: 0.658s | source
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dheera ◴[12 Jul 25 00:08 UTC] No.44538083[source]▶
> So the compressed data in a JPEG will look random, right?

I don't think JPEG data is compressed enough to be indistinguishable from random.

SD VAE with some bits lopped off gets you better compression than JPEG and yet the latents don't "look" random at all.

So you might think Huffman encoded JPEG coefficients "look" random when visualized as an image but that's only because they're not intended to be visualized that way.

replies(1): >>44538686 #
maxbond ◴[12 Jul 25 02:04 UTC] No.44538686[source]▶
Encoded JPEG data is random in the same way cows are spherical.
replies(1): >>44538815 #
1. BlaDeKke ◴[12 Jul 25 02:32 UTC] No.44538815[source]▶
Cows can be spherical.
replies(2): >>44538839 #>>44539683 #
2. ◴[12 Jul 25 02:39 UTC] No.44538839[source]▶
3. bigiain ◴[12 Jul 25 05:57 UTC] No.44539683[source]▶
And have uniform density.
replies(1): >>44540100 #
4. anyfoo ◴[12 Jul 25 07:37 UTC] No.44540100[source]▶
Yeah, but in practice you only get that in a perfect vacuum.