PUBLIC MARKS with tags png & optimisation

Kraken is a robust, ultra-fast image optimizer and compressor with best-in-class algorithms. We'll save you bandwidth and storage space and will dramatically improve your website’s load times.

pngquant is a command-line utility and a library for converting 24/32-bit PNG images to paletted (8-bit) PNGs. The conversion reduces file sizes significantly (often as much as 70%) and preserves full alpha transparency. Generated images are compatible with all modern web browsers, and have better fallback in IE6 than 24-bit PNGs.

Trimage is a cross-platform GUI and command-line interface to optimize image files for websites, using optipng, pngcrush, advpng and jpegoptim, depending on the filetype (currently, PNG and JPG files are supported). It was inspired by imageoptim. All image files are losslessy compressed on the highest available compression levels, and EXIF and other metadata is removed. Trimage gives you various input functions to fit your own workflow: A regular file dialog, dragging and dropping and various command line options.

Shrink PNG files Advanced lossy compression for PNG images that preserves full alpha transparency.

Advanced lossy compression for PNG images that preserves full alpha transparency.

Advanced lossy compression for PNG images that preserves full alpha transparency.

PNG and JPG Optimization, Freewares and Articles for Web

OptiPNG is a PNG optimizer that recompresses image files to a smaller size, without losing any information. This program also converts external formats (BMP, GIF, PNM and TIFF) to optimized PNG, and performs PNG integrity checks and corrections. If you wish to learn how PNG optimization is done, or to know about other similar tools, read the PNG-Tech article A guide to PNG optimization.

A cross-platform tool for losslessly optimizing PNG and JPG files.

"ImageOptim is a front-end (GUI) for set of tools for optimisation of PNG/JPEG images and GIF animations. Optimisation makes files smaller (in terms of disk space) by finding optimal compression parameters and by removing unneccessary information, like file comments, EXIF tags and color profiles."

punypng is a free optimization service that can dramatically reduce the file size of an image by converting it into a highly-compressed, lossless PNG image. Whether you have a GIF, JPEG or PNG, use punypng for outrageously fast page loads and help make the web more puny!

CSS-IG.net a pour thèmes principaux l'optimisation des images Web et le potentiel du format PNG (Portable Network Graphics), recommandé par le W3C. Il s'adresse aux techniciens d'interfaces Web soucieux de la performance de leur site.

Pngcrush

Pngcrush pour Windows

Flash fait encore mieux à l'export, mais avec pngnq + optipng j'arrive déjà à -70% de la taille obtenue via Photoshop sur du PNG 24 avec transparence alpha !

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