Alle konverteringene er gjort med utgangspunkt i samme råfil. Webp-filene er gjort med verktøyet webpconv 0.0.5. For å vise resultatet av webp-konverteringene, har disse igjen blitt gjort om til png. Størrelsene som er angitt i kB, gjenspeiler for webp-filene ikke det som faktisk vises på skjermen.
Merk: Eksemplene aktiveres ved å flytte pekeren over linkene, ikke ved klikking.
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| Original 367kB PNG | JPEG 19kB | webp 50% 19 kB | webp 0.1.3 19 kB |
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| Original 275kB PNG | JPEG 11,3kB | webp 50% 11,2kB |
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| Original 544kB PNG | JPEG 52,1kB | webp 50% 51,2kB | JPEG 30,4kB | webp 30% 30,2kB | webp 0.1.3 30,2kB |
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| Original 446kB PNG | JPEG 24,7kB | webp 50% 24,1kB | webp 0.1.3 24,1kB |
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| Original 361kB PNG | JPEG 13,8kB | webp 50% 13,8kB | webp 50% 13,6kB v0.1 |
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| Original 446kB PNG | JPEG 18,4kB | webp 50% 18,1kB | webp 0.1.3 18,0kB |
Det viser seg faktisk at det er sterke meninger rundt nettopp bruken av webp, at det er feil å gå i bresjen for et format som dette, når det ikke på noen måte er bedre, og i tillegg har et dårligere utgangspunkt.
| www · Sunday 17. Apr 2011 - 10:52 | |
| First slide have a wrong extension, not PNG, but it is .PNG maybe other too. But it is not a problem. But why OPERA have given JPEG files the name WEBP, when a file was JPG, it is a problem | |
| · Wednesday 25. May 2011 - 20:02 | |
| I cannot subscribe to the conclusion make, ‘that WebP gives substantially better performance when using relatively “low” file size’. [my translation] For example, for the top most photo, the 50% percent WebP image shows less detail than the JPEG of file size — there cannot be any doubt about that. You may consider that the 50% WebP is prettier — I can’t dispute your taste, but there is absolutely more detail in the same size JPEG. Even for the 90% WepP image of that photo, I find more detail in the same size JPEG than in the WebP. For instance, the shades of the shadows have more detail in the JPEG version than the WebP has. WepP, in contrast, literally blurs the picture. I'd say that only for the last — the red — photo might it be that the WebP performs better than the JPEG. But otherwise, many thanks for this interesting demo. Btw, Google claims to have improved the format, again: http://blog.chromium.org/2011/05/webp-in-chrome-picasa-gmail-with-slew.html Time for an updated test? | |
| · Thursday 26. May 2011 - 00:58 | |
| Well, I don't agree that compression artifacts equals level of detail. Jpeg suffers from compression artifacts and blocking, and webp from some smoothing - but I disagree that the total difference between them can be addressed that Jpeg has a "better level of detail". I have performed certain "re-tests" as development has progressed, but the difference has hardly been visible. Whenever an update is necessary, I will post one. Also, I believe the mentioned Chrome blog entry about webp has been in the making for quite a while, as I was given a heads up about this as far back as November 2010. | |
| · Thursday 26. May 2011 - 01:23 | |
| Define “artefact”, please. According to Wikipedia: QUOTE: “A compression artifact (or artefact) is a noticeable distortion of media – an image, audio, or video – due to the application of an overly aggressive or inappropriate lossy data compression algorithm.” http://en.wikipedia.org/wiki/Compression_artifact Clearly, both WebP images and JPEG images get distorted when they are heavily compressed. And they both show artefacts. The smoothing perhaps makes it less *obvious* to the viewer that - hey - there are some noise in this picture. But it nevertheless is an artefact. Of course, you could counter that what I describe as “more detail” should rather be described as “perceived more detail”, since it, after all, is distorted. I would be OK with that … | |
| · Thursday 26. May 2011 - 08:27 | |
| Famous last words, Leif. This adds to your trolling account. Webp shows far less artifacts and blocking for 90% compression. | |
| · Thursday 26. May 2011 - 11:20 | |
| Thanks for reminding me that I - after all - live under the law of Jante! Else, blocking is specific kind of artefact. As is the socalled smoothing. I prefer the JPEG degradation over the WebP degradation. But I accept if you have other preferences. Thanks again for a nice page. | |
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Saturday 26 November 2011





