ImageOptim — make websites and apps load faster (Mac app) Web Designer’s Guide to PNG Image Format Once upon a time, there was the mighty GIF image format, the most popular type of image compression for web graphics. Then, it was announced that software programs using GIF would require a license (this was because of the Unisys patent for the LZW compression method used in GIF). This change sped up the development for its successor: the PNG format. PNG, which stands for Portable Network Graphics, gained popularity and, nowadays, it’s probably the most used image format when it comes to web design, alongside JPEG. In this guide, we will cover everything you, as a web designer, need to know about the PNG image format. Understanding Digital Image Formats There are many digital image formats available for you to use, but only some of them are optimized for web use. Why are certain image formats suitable for the web, while others aren’t? Compression Methods There are two general kinds of image compression methods: lossy and lossless. PNG uses a lossless compression algorithm. PNG-8 and PNG-24
Banque d'Images - Photos libres de droits - Photos par abonnement La tête dans le Flux ! WebP WebP is a modern image format that provides superior lossless and lossy compression for images on the web. Using WebP, webmasters and web developers can create smaller, richer images that make the web faster. WebP lossless images are 26% smaller in size compared to PNGs. WebP lossy images are 25-34% smaller than comparable JPEG images at equivalent SSIM quality index. Lossless WebP supports transparency (also known as alpha channel) at a cost of just 22% additional bytes. For cases when lossy RGB compression is acceptable, lossy WebP also supports transparency, typically providing 3× smaller file sizes compared to PNG. More Info for Webmasters How WebP Works Lossy WebP compression uses predictive coding to encode an image, the same method used by the VP8 video codec to compress keyframes in videos. Lossless WebP compression uses already seen image fragments in order to exactly reconstruct new pixels. WebP Compression Techniques in Detail WebP Support WebP Converter Download
Regrouper les images en sprites — Compass, sauvez l'intégrateur ! — Introduction à Compass — piouPiouM’s dev Compass rend bien des services dans un domaine habituellement long, rébarbatif et — il faut le dire — prise de tête à gérer manuellement : la génération d’images en sprite. Regrouper ses images en une seule est une bonne pratique lorsque l’on vise à améliorer les performances Web d’un site. Les sprites permettent en effet de réduire le nombre de connexions HTTP ouvertes par le navigateur, ce qui contribue à réduire les temps de latence lors de l’attente des réponses du serveur et, de ce fait, à réduire le temps de chargement de la page web. Usage basique Basiquement, un sprite se génère en 2 étapes : on importe toutes les images (au format PNG obligatoirement) d’un répertoire puis on inclut les autant de classes CSS qu’il y a d’images. Dans l’exemple qui suit, on considère le dossier icon. @import "icon/*.png";@include all-icon-sprites; Notez que le nom icon du répertoire des images est repris dans le nom du mixin en charge d’inclure les classes CSS automatiquement générées par Compass.
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TinyPNG – Compress PNG images while preserving transparency