Cet outil de Google allège les images JPEG d'un tiers — Guetzli

Le format jpeg est un format développé par le groupe d'expert Joint Photographic Experts Group en 1991 et qui est aujourd'hui utilisé comme un standard d'image pour la plupart des photos diffusées sur le web. C'est ainsi que Google présente son nouvel algorithme open source, également disponible via un dépôt GitHub.

Même si les connexions internet sont de plus en plus rapides, cela ne doit pas empêcher les concepteurs de sites web, les blogueurs et tous ceux qui partagent du contenu d'optimiser leurs images. Bien sûr, les images ainsi générées sont compatibles JPEG et donc lisibles dans tout navigateur.

Guetzil fonctionne en se concentrant sur l'étape de quantification du processus de compression. Il utilise un modèle psychovisuel avancé qui tente de trouver un équilibre entre la taille des fichiers et la fidélité d'image par des transformations de couleurs simplifiées et la transformation de cosinus discrète, selon un article publié sur le blog de Google Research. Il y introduit moins de pertes visuelles, tout en générant des images 35% plus légères. Seul inconvénient de cette méthode: le temps de traitement est "significativement plus long " que des traitements traditionnels; Google ne donne pas de détails chiffrés à ce propos.

Les chercheurs à l'origine du projet espèrent voir les webmasters et les graphistes adopter l'algorithme open source.

L'exemple de l'image d'illustration ci-dessus est parlante: à gauche, l'image originale non compressée; au milieu, la même image compressée avec l'encodeur populaire libjpeg; à droite, l'image compressée avec Guetzli.

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