{"id":12137,"date":"2019-03-28T03:42:25","date_gmt":"2019-03-27T20:42:25","guid":{"rendered":"https:\/\/www.ducanhplus.com\/?p=12137"},"modified":"2019-03-28T03:42:25","modified_gmt":"2019-03-27T20:42:25","slug":"png-va-webp","status":"publish","type":"post","link":"https:\/\/kiencang.net\/png-va-webp\/","title":{"rendered":"M\u00e3 h\u00f3a kh\u00f4ng m\u1ea5t d\u1eef li\u1ec7u v\u00e0 m\u00e3 h\u00f3a thu\u1ed9c t\u00ednh trong su\u1ed1t t\u1eeb \u1ea3nh PNG th\u00e0nh WebP"},"content":{"rendered":"\n<p><strong>T\u00f3m t\u1eaft<\/strong> &#8211; Ch\u00fang t\u00f4i so s\u00e1nh vi\u1ec7c s\u1eed d\u1ee5ng t\u00e0i nguy\u00ean c\u1ee7a b\u1ed9 m\u00e3 h\u00f3a\/gi\u1ea3i m\u00e3 WebP v\u1edbi PNG trong c\u1ea3 hai ch\u1ebf \u0111\u1ed9 n\u00e9n kh\u00f4ng m\u1ea5t d\u1eef li\u1ec7u v\u00e0 m\u1ea5t d\u1eef li\u1ec7u (lossless and lossy modes). Ch\u00fang t\u00f4i s\u1eed d\u1ee5ng m\u1eabu (corpus) g\u1ed3m 12 ng\u00e0n \u1ea3nh PNG l\u1ef1a ch\u1ecdn ng\u1eabu nhi\u00ean c\u00f3 thu\u1ed9c t\u00ednh trong su\u1ed1t t\u1eeb web, v\u00e0 c\u00e1c ph\u00e9p \u0111o \u0111\u01a1n gi\u1ea3n \u0111\u1ec3 cho th\u1ea5y c\u00e1c thay \u0111\u1ed5i v\u1ec1 m\u1eb7t hi\u1ec7u su\u1ea5t. Ch\u00fang t\u00f4i n\u00e9n l\u1ea1i c\u00e1c \u1ea3nh PNG trong m\u1eabu c\u1ee7a ch\u00fang t\u00f4i \u0111\u1ec3 so s\u00e1nh \u1ea3nh WebP v\u1ec1 m\u1eb7t dung-l\u01b0\u1ee3ng-PNG-\u0111\u00e3-\u0111\u01b0\u1ee3c-t\u1ed1i-\u01b0u. K\u1ebft qu\u1ea3 c\u1ee7a ch\u00fang t\u00f4i cho th\u1ea5y <a href=\"https:\/\/kiencang.net\/dinh-dang-anh-webp\/\">\u1ea3nh \u0111\u1ecbnh d\u1ea1ng WebP<\/a> l\u00e0 thay th\u1ebf t\u1ed1t cho \u1ea3nh PNG \u0111\u1ec3 s\u1eed d\u1ee5ng tr\u00ean web tr\u00ean c\u1ea3 hai kh\u00eda c\u1ea1nh l\u00e0 dung l\u01b0\u1ee3ng v\u00e0 t\u1ed1c \u0111\u1ed9 x\u1eed l\u00fd (size and processing speed).<\/p>\n\n\n<hr class=\"wp-block-separator\"\/>\n\n\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_60 counter-hierarchy ez-toc-counter ez-toc-light-blue ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title \" >M\u1ee5c l\u1ee5c<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Toggle Table of Content\" role=\"button\"><label for=\"item-6577d661907f0\" ><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/label><input aria-label=\"Toggle\" aria-label=\"item-6577d661907f0\"  type=\"checkbox\" id=\"item-6577d661907f0\"><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/kiencang.net\/png-va-webp\/#Gioi_thieu\" title=\"Gi\u1edbi thi\u1ec7u\">Gi\u1edbi thi\u1ec7u<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/kiencang.net\/png-va-webp\/#Phuong_phap\" title=\"Ph\u01b0\u01a1ng ph\u00e1p\">Ph\u01b0\u01a1ng ph\u00e1p<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/kiencang.net\/png-va-webp\/#Tap_anh_mau\" title=\"T\u1eadp \u1ea3nh m\u1eabu\">T\u1eadp \u1ea3nh m\u1eabu<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/kiencang.net\/png-va-webp\/#Cac_ket_qua\" title=\"C\u00e1c k\u1ebft qu\u1ea3\">C\u00e1c k\u1ebft qu\u1ea3<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/kiencang.net\/png-va-webp\/#Ho_so_bo_nho\" title=\"H\u1ed3 s\u01a1 b\u1ed9 nh\u1edb\">H\u1ed3 s\u01a1 b\u1ed9 nh\u1edb<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/kiencang.net\/png-va-webp\/#Cac_ket_luan\" title=\"C\u00e1c k\u1ebft lu\u1eadn\">C\u00e1c k\u1ebft lu\u1eadn<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/kiencang.net\/png-va-webp\/#Chu_thich_tham_khao\" title=\"Ch\u00fa th\u00edch, tham kh\u1ea3o\">Ch\u00fa th\u00edch, tham kh\u1ea3o<\/a><\/li><\/ul><\/nav><\/div>\n<h2 class=\"wp-block-heading\" id=\"gi\u1edbi-thi\u1ec7u\"><span class=\"ez-toc-section\" id=\"Gioi_thieu\"><\/span>Gi\u1edbi thi\u1ec7u<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n<p>WebP h\u1ed7 tr\u1ee3 c\u1ea3 \u1ea3nh kh\u00f4ng m\u1ea5t d\u1eef li\u1ec7u v\u00e0 trong su\u1ed1t (translucent), l\u00e0m n\u00f3 c\u00f3 kh\u1ea3 n\u0103ng thay th\u1ebf \u0111\u01b0\u1ee3c cho \u0111\u1ecbnh d\u1ea1ng PNG. Nhi\u1ec1u k\u1ef9 thu\u1eadt n\u1ec1n t\u1ea3ng v\u1ed1n \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng trong n\u00e9n PNG, ch\u1eb3ng h\u1ea1n nh\u01b0 <a href=\"https:\/\/kiencang.net\/cac-ky-thuat-nen-anh-webp\/\">t\u1eeb \u0111i\u1ec3n m\u00e3 h\u00f3a, m\u00e3 h\u00f3a Huffman v\u00e0 bi\u1ebfn \u0111\u1ed5i ch\u1ec9 m\u1ee5c m\u00e0u c\u0169ng \u0111\u01b0\u1ee3c h\u1ed7 tr\u1ee3 trong WebP<\/a>, v\u1edbi c\u00e1c k\u1ebft qu\u1ea3 v\u1ec1 t\u1ed1c \u0111\u1ed9 v\u00e0 m\u1eadt \u0111\u1ed9 n\u00e9n (compression density) t\u01b0\u01a1ng t\u1ef1 trong tr\u01b0\u1eddng h\u1ee3p x\u1ea5u nh\u1ea5t. C\u00f9ng l\u00fac \u0111\u00f3, s\u1ed1 l\u01b0\u1ee3ng c\u00e1c t\u00ednh n\u0103ng m\u1edbi &#8211; ch\u1eb3ng h\u1ea1n nh\u01b0 m\u00e3 entropy chia t\u00e1ch cho c\u00e1c k\u00eanh m\u00e0u kh\u00e1c nhau, 2D c\u1ee5c b\u1ed9 c\u1ee7a kho\u1ea3ng c\u00e1ch tham chi\u1ebfu ng\u01b0\u1ee3c, v\u00e0 b\u1ed9 \u0111\u1ec7m m\u00e0u c\u1ee7a c\u00e1c m\u00e0u s\u1eafc s\u1eed d\u1ee5ng g\u1ea7n \u0111\u00e2y &#8211; cho ph\u00e9p c\u1ea3i thi\u1ec7n m\u1eadt \u0111\u1ed9 n\u00e9n v\u1edbi h\u1ea7u h\u1ebft c\u00e1c \u1ea3nh.<\/p>\n\n\n<p>Trong b\u00e0i n\u00e0y, ch\u00fang t\u00f4i so s\u00e1nh hi\u1ec7u n\u0103ng c\u1ee7a WebP so v\u1edbi PNG v\u1edbi h\u1ec7 s\u1ed1 n\u00e9n cao s\u1eed d\u1ee5ng pngcrush v\u00e0 ZopfliPNG. Ch\u00fang t\u00f4i n\u00e9n l\u1ea1i m\u1eabu \u1ea3nh tr\u00ean web c\u1ee7a m\u00ecnh s\u1eed d\u1ee5ng c\u00e1c th\u1ef1c h\u00e0nh t\u1ed1t nh\u1ea5t, v\u00e0 so s\u00e1nh v\u1edbi n\u00e9n WebP \u1edf c\u1ea3 d\u1ea1ng m\u1ea5t d\u1eef li\u1ec7u v\u00e0 kh\u00f4ng m\u1ea5t d\u1eef li\u1ec7u. Ngo\u00e0i d\u1eef li\u1ec7u m\u1eabu tham kh\u1ea3o, ch\u00fang t\u00f4i ch\u1ecdn ra hai \u1ea3nh l\u1edbn, m\u1ed9t c\u00e1i l\u00e0 \u1ea3nh ch\u1ee5p (photographic), c\u00e1i c\u00f2n l\u1ea1i l\u00e0 \u0111\u1ed3 h\u1ecda (graphical), \u0111\u1ec3 ki\u1ec3m tra t\u1ed1c \u0111\u1ed9 v\u00e0 b\u1ed9 nh\u1edb, s\u1eed d\u1ee5ng \u0111i\u1ec3m chu\u1ea9n so s\u00e1nh.<\/p>\n\n\n<p>T\u1ed1c \u0111\u1ed9 gi\u1ea3i m\u00e3 nhanh h\u01a1n so v\u1edbi PNG \u0111\u00e3 \u0111\u01b0\u1ee3c ch\u1ee9ng minh, c\u0169ng nh\u01b0 m\u1eadt \u0111\u1ed9 n\u00e9n t\u1ed1t h\u01a1n 23% so v\u1edbi \u0111\u1ecbnh d\u1ea1ng PNG \u0111ang \u0111\u1ea1t \u0111\u01b0\u1ee3c \u1edf th\u1eddi \u0111i\u1ec3m hi\u1ec7n t\u1ea1i. Ch\u00fang t\u00f4i \u0111i \u0111\u1ebfn k\u1ebft lu\u1eadn r\u1eb1ng WebP l\u00e0 thay th\u1ebf hi\u1ec7u qu\u1ea3 h\u01a1n cho \u0111\u1ecbnh d\u1ea1ng PNG \u1edf th\u1eddi \u0111i\u1ec3m hi\u1ec7n t\u1ea1i. H\u01a1n n\u1eefa, \u1ea3nh n\u00e9n m\u1ea5t d\u1eef li\u1ec7u v\u1edbi kh\u00f4ng m\u1ea5t d\u1eef li\u1ec7u k\u00eanh alpha cho kh\u1ea3 n\u0103ng t\u1ed1t h\u01a1n n\u1eefa trong vi\u1ec7c <a href=\"https:\/\/kiencang.net\/tang-toc-wordpress\/\">t\u0103ng t\u1ed1c website<\/a>.<\/p>\n\n\n<hr class=\"wp-block-separator\"\/>\n\n\n<h2 class=\"wp-block-heading\" id=\"ph\u01b0\u01a1ng-phap\"><span class=\"ez-toc-section\" id=\"Phuong_phap\"><\/span>Ph\u01b0\u01a1ng ph\u00e1p<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n<p><em>C\u00e1c c\u00f4ng c\u1ee5 d\u00f2ng l\u1ec7nh<\/em><\/p>\n\n\n<p>Ch\u00fang t\u00f4i s\u1eed d\u1ee5ng c\u00e1c c\u00f4ng c\u1ee5 d\u00f2ng l\u1ec7nh sau \u0111\u1ec3 \u0111o hi\u1ec7u n\u0103ng:<\/p>\n\n\n<ol><li>cwebp v\u00e0 dwebp. C\u00e1c c\u00f4ng c\u1ee5 n\u00e0y l\u00e0 m\u1ed9t ph\u1ea7n c\u1ee7a th\u01b0 vi\u1ec7n libwebp<\/li><li>chuy\u1ec3n \u0111\u1ed5i\/convert. \u0110\u00e2y l\u00e0 c\u00f4ng c\u1ee5 d\u00f2ng l\u1ec7nh n\u1eb1m trong ph\u1ea7n m\u1ec1m ImageMagick (6.7.7-10 2017-07-21)<\/li><li>pngcrush 1.8.12 (30\/7\/2017)<\/li><li>ZopfliPNG (17\/7\/2017)<\/li><\/ol>\n\n\n<p>Ch\u00fang t\u00f4i s\u1eed d\u1ee5ng c\u00f4ng c\u1ee5 d\u00f2ng l\u1ec7nh v\u1edbi c\u1edd \u0111i\u1ec1u khi\u1ec3n t\u01b0\u01a1ng \u1ee9ng c\u1ee7a ch\u00fang. L\u1ea5y v\u00ed d\u1ee5, n\u1ebfu ch\u00fang t\u00f4i \u0111\u1ec1 c\u1eadp t\u1edbi cwebp -q 1 -m 0, n\u00f3 c\u00f3 ngh\u0129a l\u00e0 c\u00f4ng c\u1ee5 cwebp \u0111\u00e3 \u0111\u01b0\u1ee3c g\u1ecdi l\u00ean v\u1edbi c\u1edd -q 1 v\u00e0 -m 0.<\/p>\n\n\n<hr class=\"wp-block-separator\"\/>\n\n\n<h2 class=\"wp-block-heading\" id=\"t\u1eadp-\u1ea3nh-m\u1eabu\"><span class=\"ez-toc-section\" id=\"Tap_anh_mau\"><\/span>T\u1eadp \u1ea3nh m\u1eabu<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n<p>C\u00f3 3 t\u1eadp m\u1eabu \u0111\u01b0\u1ee3c ch\u00fang t\u00f4i ch\u1ecdn l\u1ef1a:<\/p>\n\n\n<ol><li>M\u1ed9t \u1ea3nh ch\u1ee5p (h\u00ecnh 1),<\/li><li>M\u1ed9t \u1ea3nh \u0111\u1ed3 h\u1ecda v\u1edbi thu\u1ed9c t\u00ednh trong su\u1ed1t (h\u00ecnh 2), v\u00e0<\/li><li>M\u1ed9t t\u1eadp \u1ea3nh web: v\u1edbi 12 ng\u00e0n \u1ea3nh PNG \u0111\u01b0\u1ee3c l\u1ef1a ch\u1ecdn ng\u1eabu nhi\u00ean v\u1edbi thu\u1ed9c t\u00ednh trong su\u1ed1t ho\u1eb7c kh\u00f4ng, \u0111\u01b0\u1ee3c thu th\u1eadp tr\u00ean internet. Nh\u1eefng \u1ea3nh PNG n\u00e0y \u0111\u01b0\u1ee3c t\u1ed1i \u01b0u h\u00f3a th\u00f4ng qua chuy\u1ec3n \u0111\u1ed5i, pngcrush, ZopfliPNG v\u00e0 phi\u00ean b\u1ea3n nh\u1ecf nh\u1ea5t c\u1ee7a m\u1ed7i \u1ea3nh \u0111\u01b0\u1ee3c xem x\u00e9t \u0111\u00e1nh gi\u00e1 cho nghi\u00ean c\u1ee9u.<\/li><\/ol>\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter\"><img decoding=\"async\" src=\"https:\/\/kiencang.net\/wp-content\/uploads\/2019\/02\/het-ra-lua.jpg\" alt=\"h\u00e9t ra l\u1eeda\" class=\"wp-image-12140\"\/><\/figure><\/div>\n\n\n<p>H\u00ecnh 1: \u1ea2nh ch\u1ee5p, k\u00edch c\u1ee1 1024 x 752 pixels. Nh\u1ecbp th\u1edf l\u1eeda &#8220;Ban nh\u1ea1c Jaipur Maharaja&#8221; Chassepierre, B\u1ec9, t\u00e1c gi\u1ea3: Luc Viatour, gi\u1ea5y ph\u00e9p \u1ea3nh: Creative Commons Attribution-Share Alike 3.0 Unported license. Website t\u00e1c gi\u1ea3 b\u1ee9c \u1ea3nh <a href=\"http:\/\/www.lucnix.be\/\">\u1edf \u0111\u00e2y<\/a>.<\/p>\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter\"><img decoding=\"async\" src=\"https:\/\/kiencang.net\/wp-content\/uploads\/2019\/02\/anh-do-hoa.png\" alt=\"\u1ea3nh \u0111\u1ed3 h\u1ecda\" class=\"wp-image-12141\"\/><\/figure><\/div>\n\n\n<p>H\u00ecnh 2. \u1ea2nh \u0111\u1ed3 h\u1ecda, 1024 x 752 pixels. C\u00e1c \u1ea3nh \u0111\u01b0\u1ee3c gh\u00e9p t\u1eeb c\u00f4ng c\u1ee5 Google Chart.<\/p>\n\n\n<p>\u0110\u1ec3 \u0111o to\u00e0n b\u1ed9 kh\u1ea3 n\u0103ng c\u1ee7a \u0111\u1ecbnh d\u1ea1ng hi\u1ec7n c\u00f3 PNG, ch\u00fang t\u00f4i ti\u1ebfn h\u00e0nh n\u00e9n l\u1ea1i t\u1ea5t c\u1ea3 nh\u1eefng \u1ea3nh g\u1ed1c PNG s\u1eed d\u1ee5ng m\u1ed9t s\u1ed1 ph\u01b0\u01a1ng th\u1ee9c:<\/p>\n\n\n<ol><li>K\u1eb9p 8 b\u00edt cho m\u1ed7i th\u00e0nh ph\u1ea7n: convert input.png -depth 8 output.png<\/li><li>ImageMagick(1) kh\u00f4ng c\u00f3 d\u1ef1 \u0111o\u00e1n: convert input.png -qulity 90 output-candidate.png<\/li><li>ImageMagick v\u1edbi d\u1ef1 \u0111o\u00e1n th\u00edch nghi: convert input.png -quality 95 output-candidate.png<\/li><li>Pngcrush(2): pngcrush -brute -rem tEXt -rem tIME -rem iTXt -rem zTXt -rem gAMA -rem cHRM -rem iCCP -rem sRGB -rem alla -rem text input.png output-candidate.png<\/li><li>ZopfliPNG(3): zopflipng &#8211;lossy_transparent input.png output-candidate.png<\/li><li>ZopfliPNG v\u1edbi t\u1ea5t c\u1ea3 l\u1ecdc: zopflipng &#8211;iterations=500 &#8211;filters=01234mepb &#8211;lossy_8bit &#8211;lossy_transparent input.png output-candidate.png<\/li><\/ol>\n\n\n<hr class=\"wp-block-separator\"\/>\n\n\n<h2 class=\"wp-block-heading\" id=\"cac-k\u1ebft-qu\u1ea3\"><span class=\"ez-toc-section\" id=\"Cac_ket_qua\"><\/span>C\u00e1c k\u1ebft qu\u1ea3<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n<p>Ch\u00fang t\u00f4i t\u00ednh to\u00e1n m\u1eadt \u0111\u1ed9 n\u00e9n c\u1ee7a t\u1eebng \u1ea3nh trong b\u1ed9 d\u1eef li\u1ec7u m\u1eabu, li\u00ean quan \u0111\u1ebfn \u1ea3nh PNG \u0111\u00e3 \u0111\u01b0\u1ee3c t\u1ed1i \u01b0u k\u00edch c\u1ee1 cho ba ph\u01b0\u01a1ng ph\u00e1p:<\/p>\n\n\n<ol><li>N\u00e9n kh\u00f4ng m\u1ea5t d\u1eef li\u1ec7u WebP (c\u00e1c thi\u1ebft l\u1eadp m\u1eb7c \u0111\u1ecbnh)<\/li><li>N\u00e9n kh\u00f4ng m\u1ea5t d\u1eef d\u1eef li\u1ec7u WebP v\u1edbi k\u00edch c\u1ee1 nh\u1ecf nh\u1ea5t c\u00f3 th\u1ec3 (-m 6 -q 100)<\/li><li>\u1ea2nh n\u00e9n t\u1ed1t h\u01a1n trong n\u00e9n kh\u00f4ng m\u1ea5t d\u1eef li\u1ec7u WebP v\u00e0 n\u00e9n m\u1ea5t d\u1eef li\u1ec7u WebP v\u1edbi alpha (c\u00e1c thi\u1ebft l\u1eadp m\u1eb7c \u0111\u1ecbnh).<\/li><\/ol>\n\n\n<p>Ch\u00fang t\u00f4i s\u1eafp x\u1ebfp c\u00e1c h\u1ec7 s\u1ed1 n\u00e9n n\u00e0y v\u00e0 minh h\u1ecda ch\u00fang trong h\u00ecnh 3.<\/p>\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter\"><img decoding=\"async\" src=\"https:\/\/kiencang.net\/wp-content\/uploads\/2019\/02\/he-so-nen-webp-png.png\" alt=\"h\u1ec7 s\u1ed1 n\u00e9n \u1ea3nh c\u1ee7a PNG v\u00e0 WebP\" class=\"wp-image-12139\"\/><\/figure><\/div>\n\n\n<p><em>H\u00ecnh 3: M\u1eadt \u0111\u1ed9 n\u00e9n c\u1ee7a PNG \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng l\u00e0m \u0111i\u1ec3m tham chi\u1ebfu, \u1edf m\u1ed1c 1.0. C\u00f9ng c\u00e1c \u1ea3nh \u0111\u01b0\u1ee3c n\u00e9n s\u1eed d\u1ee5ng trong c\u1ea3 ph\u01b0\u01a1ng th\u1ee9c kh\u00f4ng m\u1ea5t d\u1eef li\u1ec7u v\u00e0 m\u1ea5t d\u1eef li\u1ec7u. V\u1edbi m\u1ed7i \u1ea3nh, t\u1ef7 l\u1ec7 k\u00edch c\u1ee1 n\u00e9n PNG \u0111\u01b0\u1ee3c t\u00ednh to\u00e1n v\u00e0 t\u1ef7 l\u1ec7 k\u00edch c\u1ee1 \u0111\u01b0\u1ee3c s\u1eafp x\u1ebfp, cho c\u1ea3 n\u00e9n kh\u00f4ng m\u1ea5t d\u1eef li\u1ec7u v\u00e0 m\u1ea5t d\u1eef li\u1ec7u. V\u1edbi \u0111\u01b0\u1eddng cong n\u00e9n m\u1ea5t d\u1eef li\u1ec7u th\u00ec n\u00e9n kh\u00f4ng m\u1ea5t d\u1eef li\u1ec7u s\u1ebd \u0111\u01b0\u1ee3c ch\u1ecdn trong tr\u01b0\u1eddng h\u1ee3p n\u00f3 cho ra \u1ea3nh WebP c\u00f3 k\u00edch c\u1ee1 nh\u1ecf h\u01a1n.<\/em><\/p>\n\n\n<p>WebP v\u01b0\u1ee3t qua m\u1eadt \u0111\u1ed9 n\u00e9n PNG v\u1edbi c\u1ea3 libpng \u1edf ch\u1ea5t l\u01b0\u1ee3ng cao nh\u1ea5t (chuy\u1ec3n \u0111\u1ed5i\/convert) c\u0169ng nh\u01b0 ZopfliPNG (B\u1ea3ng 1), v\u1edbi t\u1ed1c \u0111\u1ed9 m\u00e3 h\u00f3a (B\u1ea3ng 2), v\u00e0 gi\u1ea3i m\u00e3 (B\u1ea3ng 3) t\u01b0\u01a1ng \u0111\u01b0\u01a1ng v\u1edbi PNG.<\/p>\n\n\n<p><strong>B\u1ea3ng 1<\/strong>. Trung b\u00ecnh b\u00edt tr\u00ean m\u1ed7i pixel cho ba m\u1eabu s\u1eed d\u1ee5ng c\u00e1c ph\u01b0\u01a1ng th\u1ee9c kh\u00e1c nhau (th\u1ea5p h\u01a1n th\u00ec t\u1ed1t h\u01a1n):<\/p>\n\n\n<figure class=\"wp-block-table\"><table><thead><tr><th>B\u1ed9 \u1ea2nh<\/th><th>convert -quality 95<\/th><th>ZopfliPNG<\/th><th>WebP kh\u00f4ng m\u1ea5t d\u1eef li\u1ec7u -q 0 -m 1<\/th><th>WebP kh\u00f4ng m\u1ea5t d\u1eef li\u1ec7u (thi\u1ebft l\u1eadp m\u1eb7c \u0111\u1ecbnh)<\/th><th>WebP kh\u00f4ng m\u1ea5t d\u1eef li\u1ec7u -m 6 -q 100<\/th><th>WebP m\u1ea5t d\u1eef li\u1ec7u v\u1edbi alpha<\/th><\/tr><\/thead><tbody><tr><td>\u1ea3nh ch\u1ee5p<\/td><td>12.3<\/td><td>12.2<\/td><td>10.5<\/td><td>10.1<\/td><td>9.83<\/td><td>0.81<\/td><\/tr><tr><td>\u0111\u1ed3 h\u1ecda<\/td><td>1.36<\/td><td>1.05<\/td><td>0.88<\/td><td>0.71<\/td><td>0.70<\/td><td>0.51<\/td><\/tr><tr><td>web<\/td><td>6.85<\/td><td>5.05<\/td><td>4.42<\/td><td>4.04<\/td><td>3.96<\/td><td>1.92<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n<p>&#8212;<\/p>\n\n\n<p><strong>B\u1ea3ng 2.<\/strong> Th\u1eddi gian m\u00e3 h\u00f3a trung b\u00ecnh cho m\u1eabu n\u00e9n v\u00e0 cho c\u00e1c ph\u01b0\u01a1ng th\u1ee9c n\u00e9n kh\u00e1c (th\u1ea5p h\u01a1n th\u00ec t\u1ed1t h\u01a1n):<\/p>\n\n\n<figure class=\"wp-block-table\"><table><thead><tr><th>B\u1ed9 \u1ea2nh<\/th><th>convert -quality 95<\/th><th>ZopfliPNG<\/th><th>WebP kh\u00f4ng m\u1ea5t d\u1eef li\u1ec7u -q 0 -m 1<\/th><th>WebP kh\u00f4ng m\u1ea5t d\u1eef li\u1ec7u (thi\u1ebft l\u1eadp m\u1eb7c \u0111\u1ecbnh)<\/th><th>WebP kh\u00f4ng m\u1ea5t d\u1eef li\u1ec7u -m 6 -q 100<\/th><th>WebP m\u1ea5t d\u1eef li\u1ec7u v\u1edbi alpha<\/th><\/tr><\/thead><tbody><tr><td>\u1ea3nh ch\u1ee5p<\/td><td>0.500s<\/td><td>8.7s<\/td><td>0.293s<\/td><td>0.780s<\/td><td>8.440s<\/td><td>0.111s<\/td><\/tr><tr><td>\u0111\u1ed3 h\u1ecda<\/td><td>0.179s<\/td><td>14.0s<\/td><td>0.065s<\/td><td>0.140s<\/td><td>3.510s<\/td><td>0.184s<\/td><\/tr><tr><td>web<\/td><td>0.040s<\/td><td>1.55s<\/td><td>0.017s<\/td><td>0.072s<\/td><td>2.454s<\/td><td>0.020s<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n<p>&#8212;<\/p>\n\n\n<p><strong>B\u1ea3ng 3.<\/strong> Th\u1eddi gian gi\u1ea3i m\u00e3 trung b\u00ecnh cho ba m\u1eabu \u1ea3nh v\u1edbi c\u00e1c ph\u01b0\u01a1ng th\u1ee9c v\u00e0 thi\u1ebft l\u1eadp kh\u00e1c nhau<\/p>\n\n\n<figure class=\"wp-block-table\"><table><thead><tr><th>B\u1ed9 \u1ea2nh<\/th><th>convert -quality 95<\/th><th>ZopfliPNG<\/th><th>WebP kh\u00f4ng m\u1ea5t d\u1eef li\u1ec7u -q 0 -m 1<\/th><th>WebP kh\u00f4ng m\u1ea5t d\u1eef li\u1ec7u (thi\u1ebft l\u1eadp m\u1eb7c \u0111\u1ecbnh)<\/th><th>WebP kh\u00f4ng m\u1ea5t d\u1eef li\u1ec7u -m 6 -q 100<\/th><th>WebP m\u1ea5t d\u1eef li\u1ec7u v\u1edbi alpha<\/th><\/tr><\/thead><tbody><tr><td>\u1ea3nh ch\u1ee5p<\/td><td>0.027s<\/td><td>0.026s<\/td><td>0.027s<\/td><td>0.026s<\/td><td>0.027s<\/td><td>0.012s<\/td><\/tr><tr><td>\u0111\u1ed3 h\u1ecda<\/td><td>0.049s<\/td><td>0.015s<\/td><td>0.005s<\/td><td>0.005s<\/td><td>0.003s<\/td><td>0.010s<\/td><\/tr><tr><td>web<\/td><td>0.007s<\/td><td>0.005s<\/td><td>0.003s<\/td><td>0.003s<\/td><td>0.003s<\/td><td>0.003s<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n<p>Ch\u00fa th\u00edch:<\/p>\n\n\n<ul><li>\u1ea3nh ch\u1ee5p\/photo<\/li><li>\u1ea3nh \u0111\u1ed3 h\u1ecda\/graphics<\/li><li>\u1ea3nh thu \u0111\u01b0\u1ee3c t\u1eed web\/web<\/li><\/ul>\n\n\n<hr class=\"wp-block-separator\"\/>\n\n\n<h2 class=\"wp-block-heading\" id=\"h\u1ed3-s\u01a1-b\u1ed9-nh\u1edb\"><span class=\"ez-toc-section\" id=\"Ho_so_bo_nho\"><\/span>H\u1ed3 s\u01a1 b\u1ed9 nh\u1edb<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n<p>V\u1edbi h\u1ed3 s\u01a1 b\u1ed9 nh\u1edb, ch\u00fang t\u00f4i ghi l\u1ea1i k\u00edch c\u1ee1 t\u1ed1i \u0111a \u0111\u01b0\u1ee3c b\u00e1o c\u00e1o b\u1edfi \/user.bin.tim -v<\/p>\n\n\n<p>V\u1edbi m\u1eabu \u1ea3nh qu\u00e9t tr\u00ean m\u1ea1ng internet, k\u00edch c\u1ee1 c\u1ee7a \u1ea3nh l\u1edbn nh\u1ea5t \u0111\u01b0\u1ee3c xem l\u00e0 b\u1ed9 nh\u1edb s\u1eed d\u1ee5ng l\u1edbn nh\u1ea5t. \u0110\u1ec3 gi\u1eef ph\u00e9p \u0111o b\u1ed9 nh\u1edb c\u00f3 \u0111\u1ecbnh ngh\u0129a t\u1ed1t h\u01a1n ch\u00fang t\u00f4i s\u1eed d\u1ee5ng b\u1ee9c \u1ea3nh ch\u1ee5p (h\u00ecnh 1) \u0111\u1ec3 c\u00f3 \u0111\u01b0\u1ee3c c\u00e1i nh\u00ecn t\u1ed5ng quan v\u1ec1 vi\u1ec7c s\u1eed d\u1ee5ng b\u1ed9 nh\u1edb. \u1ea2nh \u0111\u1ed3 h\u1ecda \u0111\u01b0a ra cho c\u00e1c k\u1ebft qu\u1ea3 t\u01b0\u01a1ng t\u1ef1.<\/p>\n\n\n<p>Ch\u00fang t\u00f4i \u0111o 10 \u0111\u1ebfn 19 MiB v\u1edbi libpng v\u00e0 ZopfliPNG, v\u00e0 25MiB v\u00e0 32MiB cho m\u00e3 h\u00f3a WebP kh\u00f4ng m\u1ea5t d\u1eef li\u1ec7u t\u1ea1i thi\u1ebft l\u1eadp -q 0 -m 1, v\u00e0 -q 95 (v\u1edbi gi\u00e1 tr\u1ecb m\u1eb7c \u0111\u1ecbnh c\u1ee7a -m) t\u01b0\u01a1ng \u1ee9ng.<\/p>\n\n\n<p>Trong th\u00ed nghi\u1ec7m v\u1ec1 gi\u1ea3i m\u00e3, convert -resize 1&#215;1 s\u1eed d\u1ee5ng 10 MiB cho c\u1ea3 libpng v\u00e0 ZopfliPNG \u0111\u1ec3 t\u1ea1o ra file PNG. S\u1eed d\u1ee5ng cwebp, gi\u1ea3i m\u00e3 kh\u00f4ng m\u1ea5t d\u1eef li\u1ec7u WebP s\u1eed d\u1ee5ng 7 MiB, v\u00e0 gi\u1ea3i m\u00e3 m\u1ea5t d\u1eef li\u1ec7u s\u1eed d\u1ee5ng 3MiB.<\/p>\n\n\n<hr class=\"wp-block-separator\"\/>\n\n\n<h2 class=\"wp-block-heading\" id=\"cac-k\u1ebft-lu\u1eadn\"><span class=\"ez-toc-section\" id=\"Cac_ket_luan\"><\/span>C\u00e1c k\u1ebft lu\u1eadn<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n<p>Ch\u00fang t\u00f4i v\u1eeba tr\u00ecnh b\u00e0y c\u1ea3 t\u1ed1c \u0111\u1ed9 m\u00e3 h\u00f3a v\u00e0 gi\u1ea3i m\u00e3 c\u1ee7a c\u00f9ng m\u1ed9t t\u1ec7p c\u00e1c \u1ea3nh PNG. C\u00f3 s\u1ef1 gia t\u0103ng trong vi\u1ec7c s\u1eed d\u1ee5ng b\u1ed9 nh\u1edb trong pha m\u00e3 h\u00f3a, nh\u01b0ng pha gi\u1ea3i m\u00e3 cho th\u1ea5y s\u1ef1 suy gi\u1ea3m l\u00e0nh m\u1ea1nh, \u00edt nh\u1ea5t l\u00e0 khi so s\u00e1nh h\u00e0nh vi c\u1ee7a cwebp v\u1edbi chuy\u1ec3n \u0111\u1ed5i c\u1ee7a ImageMagick.<\/p>\n\n\n<p>M\u1eadt \u0111\u1ed9 n\u00e9n t\u1ed1t h\u01a1n \u0111\u1ebfn h\u01a1n 99% trong s\u1ed1 t\u1ea5t c\u1ea3 c\u00e1c \u1ea3nh tr\u00ean web, \u0111i\u1ec1u \u0111\u00f3 g\u1ee3i \u00fd r\u1eb1ng c\u00f3 th\u1ec3 chuy\u1ec3n d\u1ec5 d\u00e0ng t\u1eeb PNG sang WebP.<\/p>\n\n\n<p>Khi WebP \u0111\u01b0\u1ee3c ch\u1ea1y v\u1edbi c\u00e1c thi\u1ebft l\u1eadp m\u1eb7c \u0111\u1ecbnh, n\u00f3 n\u00e9n t\u1ed1t h\u01a1n 42% so v\u1edbi libpng, v\u00e0 t\u1ed1t h\u01a1n 23% so v\u1edbi ZopfliPNG. \u0110i\u1ec1u \u0111\u00f3 g\u1ee3i \u00fd r\u1eb1ng WebP c\u00f3 kh\u1ea3 n\u0103ng \u0111\u1ea7y h\u1ee9a h\u1eb9n trong vi\u1ec7c t\u0103ng t\u1ed1c c\u00e1c website n\u1eb7ng v\u1ec1 h\u00ecnh \u1ea3nh.<\/p>\n\n\n<hr class=\"wp-block-separator\"\/>\n\n\n<h2 class=\"wp-block-heading\" id=\"references\"><span class=\"ez-toc-section\" id=\"Chu_thich_tham_khao\"><\/span>Ch\u00fa th\u00edch, tham kh\u1ea3o<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n<ol><li><a href=\"http:\/\/www.imagemagick.org\/script\/index.php\">ImageMagick<\/a><\/li><li><a href=\"http:\/\/pmt.sourceforge.net\/pngcrush\/\">Pngcrush<\/a><\/li><li><a href=\"https:\/\/github.com\/google\/zopfli\">ZopfliPNG<\/a><\/li><\/ol>\n\n\n<p><em>C\u00e1c t\u00e1c gi\u1ea3:<\/em><\/p>\n\n\n<p><em>Jyrki Alakuijala, Ph.D., Google, Inc. <\/em><\/p>\n\n\n<p><em>Vincent Rabaud, Ph.D., Google, Inc.<\/em><\/p>\n\n\n<p><em>(D\u1ecbch t\u1eeb b\u00e0i vi\u1ebft Lossless and Transparency Encoding in WebP &#8211; Website: Google Developers)<\/em><\/p>\n","protected":false},"excerpt":{"rendered":"<p>T\u00f3m t\u1eaft &#8211; Ch\u00fang t\u00f4i so s\u00e1nh vi\u1ec7c s\u1eed d\u1ee5ng t\u00e0i nguy\u00ean c\u1ee7a b\u1ed9 m\u00e3 h\u00f3a\/gi\u1ea3i m\u00e3 WebP v\u1edbi PNG trong c\u1ea3 hai ch\u1ebf \u0111\u1ed9 n\u00e9n kh\u00f4ng m\u1ea5t d\u1eef li\u1ec7u v\u00e0 m\u1ea5t d\u1eef li\u1ec7u (lossless and lossy modes). 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