Nonplussed by samples
Posted Mar 26, 2011 15:07 UTC (Sat) by tack
Parent article: Using Google's WebP Image Format with Open Tools on Linux (Linux.com)
Google has a small gallery comparing JPEG and WebP, and I'm very confused by what they're trying to show. Comparing codecs is, to borrow from Snape, a bit of a subtle science and exact art, but in order to be able to make any useful statements, you need to either compare quality at the same file size, or compare file size at the same quality.
Yet the examples on the gallery are clearly different qualities at different file sizes. Or, if they are intended to be the same quality, I'm not impressed by what I see in WebP. There's much less ringing in WebP compared to JPEG, but at the expense of a considerable amount of detail. Worse, the WebP samples exhibit awful DCT blocking artifacts and a bit of banding, neither of which are present (or nearly as apparent) in the JPEG samples.
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