optipng home page
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 works, or to know about other similar tools, see the PNGÂ Tech article A guide to PNG optimization. DOWNLOAD opti
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PNG can be a lossy format
DownloadVersion 1.5.1 Mac OS X 10.8-10.13 Not using a Mac? Check out Color Quantizer (Windows), pngquant (Unix) and TinyPNG (on-line). Snow Leopard (10.6) versionChangelogBugsDonateSource code PNG has been created as a lossless image format, meaning it's supposed to exactly preserve all details of an image, even minuscule ones that are hardly noticeable. Preservation of those tiny details costs a
PNGç”»åƒæœ€é©åŒ–ã®æ®µéšŽåˆ¥ãƒ„ール紹介 – セルティスラボ
ç”»åƒæœ€é©åŒ–ツールを最é©åŒ–ã®æ®µéšŽåˆ¥ã«ç´¹ä»‹ã—ã¾ã™ 今ã¾ã§ãƒ–ãƒã‚°ã«è¼‰ã›ã¦ã„ã‚‹ç”»åƒã®ã»ã¨ã‚“ã©ã¯ã€ãŠå‹§ã‚スクリーンã‚ャプãƒãƒ£ãƒ¼ãƒ„ール ã¨ã—ã¦ä»¥å‰ç´¹ä»‹ã—ãŸã€Skitch ã‚„ Awesome Screenshot を使用ã—ãŸã‚‚ã®ã§ã™ãŒã€Google PageSpeed ã§ãƒã‚§ãƒƒã‚¯ã™ã‚‹ã¨ç”»åƒã®æœ€é©åŒ–ã®æ”¹å–„æ案ãŒãªã•ã‚Œã¾ã™ ç”»åƒã®æœ€é©åŒ–ã¨ã¯ã€ä½•ã‚’ã™ã‚Œã°ã„ã„ã®ã§ã—ょã†ã‹ ç”»åƒã‚’最é©åŒ–ã™ã‚‹ ç”»åƒã®ã‚µã‚¤ã‚ºã‚’指定ã™ã‚‹ 具体的ã«ã©ã†ã™ã‚Œã°ã‚ˆã„ã‹ã¨ã„ã†ã¨ã€ã‚µã‚¤ã‚ºã‚’å°ã•ãã—ã¦è‰²ã‚’減らã—ã¾ã—ょã†ã¨ã„ã†ã“ã¨ã§ã™ã€‚ã‚ャプãƒãƒ£ãƒ¼ç”»åƒãŒãƒ•ãƒ«ã‚«ãƒ©ãƒ¼ãªã‚‰ã°ã€ï¼’５６ã¸æ¸›è‰²ã—ã€è¡¨ç¤ºã‚µã‚¤ã‚ºã‚ˆã‚Šå¤§ããªã‚µã‚¤ã‚ºã®ç”»åƒã‚’使用ã—ã¦ã„ãŸã‚‰ã€é©åˆ‡ã«ç¸®å°ã—ãŸç”»åƒã‚’使用ã™ã‚‹ã¨ã„ã†ã“ã¨ã§ã™ 方法ã¨ã—ã¦ã¯ã€ã„ã‚ã„ã‚ã‚ã‚‹ã®ã§è‡ªåˆ†ã®ä½œæ¥ã—ã‚„ã™ã„方法をå–ã‚Œã°ã„ã„ã®ã§ã™ãŒã€ãªã‹ãªã‹ã“ã‚Œã ã‘ã§OKã¨è¨€ã†ã®ã¯ãªã組ã¿åˆã‚ã›ã‚‹ã—ã‹ãªã•ãã†ãªæ„Ÿã˜ã§ã™ 今回ã€æœ€é©åŒ–ã®åº¦åˆã„ã«ãŠã„
ç”»åƒåœ§ç¸®ã‚µã‚¤ãƒˆï¼TinyPNG
Smart WebP, PNG and JPEG Compression for Faster Websites
PNGCRUSH
[DOWNLOAD] [CHANGELOG] Pngcrush is an optimizer for PNG (Portable Network Graphics) files. It can be run from a commandline in an MSDOS window, or from a UNIX or LINUX commandline. Its main purpose is to reduce the size of the PNG IDAT datastream by trying various compression levels and PNG filter methods. It also can be used to remove unwanted ancillary chunks, or to add certain chunks including
How To Optimize PNG — Smashing Magazine
This post describes some techniques that may help you optimize your PNG-images. These techniques are derived from laborious hours spent on studying how exactly the PNG encoder saves data. We’ll start with some essentials about the PNG format and will then move to advanced optimization techniques. As a web designer you might be already familiar with the PNG image format which offers a full-featured
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
［ウェブサービスレビュー］PNGç”»åƒã®ãƒ•ã‚¡ã‚¤ãƒ«ã‚µã‚¤ã‚ºã‚’ç´„7割削減ã§ãる「TinyPNGã€
内容：「TinyPNGã€ã¯ã€PNGフォーマットã®ç”»åƒã‚’圧縮ã§ãるオンラインツールã 。スマートフォンã®ã‚¹ã‚¯ãƒªãƒ¼ãƒ³ã‚·ãƒ§ãƒƒãƒˆãªã©PNGフォーマットを用ã„ãŸç”»åƒã‚’ドラッグ＆ドãƒãƒƒãƒ—ã™ã‚Œã°ã€ç”»è³ªã‚’極力ä¿ã£ãŸã¾ã¾ã€ãƒ•ã‚¡ã‚¤ãƒ«ã‚µã‚¤ã‚ºã‚’ç´„7割削減ã—ã¦ãれる便利ãªã‚µãƒ¼ãƒ“スã 。 「TinyPNGã€ã¯ã€PNGフォーマットã®ç”»åƒã‚’圧縮ã§ãるオンラインツールã 。スマートフォンã®ã‚¹ã‚¯ãƒªãƒ¼ãƒ³ã‚·ãƒ§ãƒƒãƒˆãªã©PNGフォーマットを用ã„ãŸç”»åƒã‚’ドラッグ＆ドãƒãƒƒãƒ—ã™ã‚Œã°ã€ç”»è³ªã‚’極力ä¿ã£ãŸã¾ã¾ã€ãƒ•ã‚¡ã‚¤ãƒ«ã‚µã‚¤ã‚ºã‚’ç´„7割削減ã—ã¦ãれる便利ãªã‚µãƒ¼ãƒ“スã 。 使ã„æ–¹ã¯ç°¡å˜ã§ã€ã‚µã‚¤ãƒˆã®ãƒˆãƒƒãƒ—ページã«æŒ‡å®šã•ã‚Œã¦ã„るエリアã«ã€PNGファイルをドラッグ＆ドãƒãƒƒãƒ—ã™ã‚‹ã ã‘。ã™ãã•ã¾ã‚¢ãƒƒãƒ—ãƒãƒ¼ãƒ‰ãŠã‚ˆã³åœ§ç¸®ã•ã‚Œã€å®Œäº†ã™ã‚‹ã¨ãƒ€ã‚¦ãƒ³ãƒãƒ¼ãƒ‰ã®ãƒªãƒ³ã‚¯ãŒè¡¨ç¤ºã•ã‚Œã‚‹ã¨ã¨ã‚‚ã«ã€å…ƒã®ã‚µã‚¤ã‚ºã«å¯¾ã—ã¦ã©ã®ç¨‹åº¦åœ§ç¸®ã•ã‚ŒãŸã®ã‹ãŒãƒ‘ーセンテージã§è¡¨ç¤ºã•ã‚Œã‚‹ã€‚ ä¸å¤®ä¸Šã®æŒ‡å®šã•ã‚ŒãŸã‚¨ãƒªã‚¢
PNG軽é‡åŒ–ã®æ¸›è‰²ã¨åœ§ç¸®ã«ã¤ã„㦠| GREE Engineering
ã“ã®ãƒ†ãƒ¼ãƒ–ルã®ç•ªå·ã¯ 1 Byte ã«ãªã£ã¦ã„ã‚‹ãŸã‚ã€0-255 ã® 256 個ã—ã‹ç™»éŒ²ã§ãã¾ã›ã‚“。ãã®ãŸã‚ã€ç”»åƒã§ä½¿ç”¨ã•ã‚Œã¦ã„る色㌠256 個より多ã„å ´åˆã¯ã€ãªã‚“ã¨ã‹ã—㦠256 個ã«ã—ãªãã¦ã¯ã„ã‘ã¾ã›ã‚“。 ã“ã®ã€Œãªã‚“ã¨ã‹ã—㦠256 色ã«ã™ã‚‹ã€ã¨ã„ã†ã®ãŒæ¸›è‰²å‡¦ç†ã§ã€ãªã‚‹ã¹ãå…ƒã®ç”»åƒã‹ã‚‰ã®å¤‰åŒ–を分ã‹ã‚‰ãªã„よã†ã«ã—ãªãŒã‚‰è‰²ã‚’減らã—ã¦ã„ããŸã‚ã®ã‚¢ãƒ«ã‚´ãƒªã‚ºãƒ 実装ã§ã™ã€‚（ã“ã®è¨˜äº‹ã§ã¯æ¸›è‰²ã‚¢ãƒ«ã‚´ãƒªã‚ºãƒ ã«ã¤ã„ã¦ã®èª¬æ˜Žã¯çœç•¥ã—ã¾ã™ã€‚） テーブルを作æˆã—ãŸã‚‰ã€ç”»åƒã®ãã‚Œãžã‚Œã®ãƒ”クセルを RGB å½¢å¼ã‹ã‚‰ãƒ†ãƒ¼ãƒ–ルã®ä½•ç•ªç›®ã®è‰²ã‚’使ã†ã‹ã«ç½®ãæ›ãˆã¾ã™ã€‚ 上図ã®ã‚ˆã†ã«ã€1 ピクセルã‚ãŸã‚Š 24bit å¿…è¦ã ã£ãŸç”»åƒãŒ 1 ピクセルã‚ãŸã‚Š 8bit ã«ãªã£ãŸã®ã§ã€ãƒ‡ãƒ¼ã‚¿ã‚µã‚¤ã‚ºã¯å¤§ä½“ 1/3 ã«ãªã‚Šã¾ã™ã€‚ （パレットã®ãƒ‡ãƒ¼ã‚¿ã«æœ€å¤§ 3 Byte * 256 = 768 Byte å¿…è¦ã¨ã‹ã€åŒã˜ã‚ˆã†ã«åœ§ç¸®ã•ã‚Œãªã„ã¨
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Reduce PNG Graphic Size Using PNGCRUSH
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