alt Hacker NewsThe point is that you can’t tell whether it’s a lossless image by looking at the extension.
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mnw21cam • today at 3:40 PM
It's not the PNG encoding that causes the loss. The optimisers are literally creating a different image and then losslessly encoding it as PNG.
But it's also a valid point.
By that definition, all formats are lossy, because any preprocessing could be lossy, and the word loses all meaning … which is why we don't use that definition.