Lossy format conversion

Lossy format conversion

Posted Dec 12, 2011 2:54 UTC (Mon) by jimparis (subscriber, #38647)
In reply to: Lossy format conversion by corbet
Parent article: Improving ext4: bigalloc, inline data, and metadata checksums

You can't replace missing information, but you could still make something that sounds better -- in a subjective sense. For example, maybe the mp3 has harsh artifacts at higher frequencies that the ogg encoder would remove.

It could apply to lossy image transformations too. Consider this sample set of images. An initial image is pixelated (lossy), and that result is then blurred (also lossy). Some might argue that the final result looks better than the intermediate one, even though all it did was throw away more information.

But I do agree that this is off-topic, and that such improvement is probably rare in practice.

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