A guide to PNG optimization
1. Background 1.1 The PNG file format The Portable Network Graphics (PNG) is a format for storing compressed raster graphics. The compression engine is based on the Deflate method [RFC1951], designed by PKWare and originally used in PKZIP. The PNG format is defined by the PNG Specification. This specification was developed by an ad-hoc group named the PNG Development Group, and it is both an Inter
Squeezing PNG Images
Ariya Hidayat (@ariyahidayat) is an engineer/technical lead/FOSS fan/blogger/speaker. These days, his activities are mostly on software craftsmanship around HTML5, JavaScript, and other web technologies. PNG is a popular format for icons, sprites, logos, screenshots, and many others. Creating PNG images is fairly easy, but what do we need to do if we want to get the smallest file possible without
pngquant — lossy PNG compressor
pngquant is a command-line utility and a library for lossy compression of PNG images. The conversion reduces file sizes significantly (often as much as 70%) and preserves full alpha transparency. Generated images are compatible with all web browsers and operating systems. Features High-quality palette generation using a combination of vector quantization algorithms. Unique adaptive dithering algor
IT戦記 - 僕も半透明 png を使うためのライブラリ作った！
いろいろと古い IE で半透明 png を使うための JS が紹介されています http://web.kankodo.net/2007/02/01-233315.html http://labs.unoh.net/2007/02/ie6_png_fix.html http://phpspot.org/blog/archives/2007/02/iepngjavascript.html で、自分も使おうと思ったのですが。 ライブラリの依存とか、 window の load イベントの時に処理されるのがちょっとだけ嫌だったので、自分用のを作りました。 意外と便利だったので公開します デモ(IE5.5 or IE 6 で見てください) http://usrb.in/amachang/static/AlphaLoader/demo.html 使いかた 半透明にしたい img 要素のあとに http
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半透明pngを表示する 〜CSSテクニック〜
