{"id":16871,"date":"2020-04-02T17:27:54","date_gmt":"2020-04-02T10:27:54","guid":{"rendered":"https:\/\/kiencang.net\/?p=15760"},"modified":"2023-08-25T13:14:00","modified_gmt":"2023-08-25T06:14:00","slug":"anh-jpeg-progressive-la-gi","status":"publish","type":"post","link":"https:\/\/kiencang.net\/anh-jpeg-progressive-la-gi\/","title":{"rendered":"\u1ea2nh JPEG progressive l\u00e0 g\u00ec? N\u00f3 gi\u00fap g\u00ec trong vi\u1ec7c c\u1ea3i thi\u1ec7n tr\u1ea3i nghi\u1ec7m ng\u01b0\u1eddi d\u00f9ng?"},"content":{"rendered":"\n<p>\u0110\u1ecbnh d\u1ea1ng \u1ea3nh JPEG l\u00e0 m\u1ed9t trong <a href=\"https:\/\/kiencang.net\/gif-png-jpg-hoac-svg\/\" target=\"_blank\" rel=\"noreferrer noopener\">c\u00e1c \u0111\u1ecbnh d\u1ea1ng \u1ea3nh ph\u1ed5 bi\u1ebfn nh\u1ea5t tr\u00ean th\u1ebf gi\u1edbi web<\/a> (c\u00e1c \u0111\u1ecbnh d\u1ea1ng c\u00f2n l\u1ea1i g\u1ed3m PNG, GIF, SVG). \u0110\u1ecbnh d\u1ea1ng JPEG th\u01b0\u1eddng \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng cho c\u00e1c \u1ea3nh ph\u1ee9c t\u1ea1p, nhi\u1ec1u m\u00e0u s\u1eafc, th\u00ed d\u1ee5 nh\u01b0 \u1ea3nh ch\u1ee5p thi\u00ean nhi\u00ean, con ng\u01b0\u1eddi. \u0110\u1eb7c t\u1ea3 c\u1ee7a JPEG bao g\u1ed3m m\u1ed9t lo\u1ea1t c\u00e1c ph\u1ea7n m\u1edf r\u1ed9ng h\u1ee3p l\u1ec7, tuy nhi\u00ean ph\u1ed5 bi\u1ebfn nh\u1ea5t v\u1eabn l\u00e0 <em>.jpg<\/em> v\u00e0 <em>.jpeg<\/em><\/p>\n\n\n\n<p>Kh\u00f4ng th\u00e0nh v\u1ea5n \u0111\u1ec1 \u0111u\u00f4i m\u1edf r\u1ed9ng l\u00e0 g\u00ec, t\u1ea5t c\u1ea3 c\u00e1c \u1ea3nh JPEG s\u1ebd \u0111\u01b0\u1ee3c \u0111\u1ed1i x\u1eed \u00edt nhi\u1ec1u gi\u1ed1ng nhau, m\u1eb7c d\u00f9 kh\u00f4ng ph\u1ea3i t\u1ea5t c\u1ea3 c\u00e1c \u1ea3nh JPEG \u0111\u1ec1u \u0111\u01b0\u1ee3c t\u1ea1o ra nh\u01b0 nhau. Trong \u0111\u1eb7c t\u1ea3 \u0111\u1ecbnh d\u1ea1ng \u1ea3nh t\u1ed3n t\u1ea1i m\u1ed9t c\u00e0i \u0111\u1eb7t \u00edt \u0111\u01b0\u1ee3c bi\u1ebft \u0111\u1ebfn. C\u00e0i \u0111\u1eb7t n\u00e0y \u0111\u01b0\u1ee3c g\u1ecdi l\u00e0 <em>Progressive Mode<\/em> (ch\u1ebf \u0111\u1ed9 l\u0169y ti\u1ebfn), c\u00f3 th\u1ec3 \u0111em \u0111\u1ebfn kh\u1ea3 n\u0103ng c\u1ea3i thi\u1ec7n m\u1ea1nh tr\u1ea3i nghi\u1ec7m s\u1eed d\u1ee5ng \u1ea3nh JPEG tr\u00ean website.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-css-opacity\"\/>\n\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-6577d7518ea85\" ><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-6577d7518ea85\"  type=\"checkbox\" id=\"item-6577d7518ea85\"><\/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\/anh-jpeg-progressive-la-gi\/#1_Anh_JPEG_thong_thuong_vs_anh_JPEG_progressive\" title=\"#1. \u1ea2nh JPEG th\u00f4ng th\u01b0\u1eddng vs \u1ea3nh JPEG progressive\">#1. \u1ea2nh JPEG th\u00f4ng th\u01b0\u1eddng vs \u1ea3nh JPEG progressive<\/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\/anh-jpeg-progressive-la-gi\/#2_Quan_sat_trong_thuc_te\" title=\"#2. Quan s\u00e1t trong th\u1ef1c t\u1ebf\">#2. Quan s\u00e1t trong th\u1ef1c t\u1ebf<\/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\/anh-jpeg-progressive-la-gi\/#3_Tai_sao_anh_progressive_lai_tot_hon_baseline\" title=\"#3. T\u1ea1i sao \u1ea3nh progressive l\u1ea1i t\u1ed1t h\u01a1n baseline\">#3. T\u1ea1i sao \u1ea3nh progressive l\u1ea1i t\u1ed1t h\u01a1n baseline<\/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\/anh-jpeg-progressive-la-gi\/#4_Minh_hoa_bang_do_hoa_dong_theo_thoi_gian_thuc\" title=\"#4. Minh h\u1ecda b\u1eb1ng \u0111\u1ed3 h\u1ecda \u0111\u1ed9ng theo th\u1eddi gian th\u1ef1c\">#4. Minh h\u1ecda b\u1eb1ng \u0111\u1ed3 h\u1ecda \u0111\u1ed9ng theo th\u1eddi gian th\u1ef1c<\/a><\/li><\/ul><\/nav><\/div>\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"1_Anh_JPEG_thong_thuong_vs_anh_JPEG_progressive\"><\/span>#1. \u1ea2nh JPEG th\u00f4ng th\u01b0\u1eddng vs \u1ea3nh JPEG progressive<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>Y\u1ebfu t\u1ed1 gi\u00fap x\u00e1c \u0111\u1ecbnh, ph\u00e2n lo\u1ea1i l\u1edbn nh\u1ea5t \u0111\u1ed1i v\u1edbi m\u1ed9t \u0111\u1ecbnh d\u1ea1ng \u1ea3nh th\u01b0\u1eddng l\u00e0 ki\u1ec3u n\u00e9n (compression) c\u1ee7a n\u00f3 &#8211; c\u00e1c ph\u01b0\u01a1ng th\u1ee9c thay \u0111\u1ed5i r\u1ea5t r\u1ed9ng. Trong th\u1ef1c t\u1ebf \u0111i\u1ec1u \u0111\u00f3 l\u00e0m cho c\u00e1c \u0111\u1ecbnh d\u1ea1ng nh\u1ea5t \u0111\u1ecbnh ph\u00f9 h\u1ee3p h\u01a1n so v\u1edbi c\u00e1c \u0111\u1ecbnh d\u1ea1ng kh\u00e1c t\u00f9y thu\u1ed9c v\u00e0o c\u00e1ch \u1ea3nh \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng trong th\u1ef1c t\u1ebf. Th\u1eadm ch\u00ed ngay ch\u1ec9 trong \u0111\u1ecbnh d\u1ea1ng JPEG, b\u1ea1n c\u00f3 th\u1ec3 nh\u1eadn \u0111\u01b0\u1ee3c c\u00e1c k\u1ebft qu\u1ea3 thay \u0111\u1ed5i nhi\u1ec1u d\u1ef1a tr\u00ean c\u00e1c c\u00e0i \u0111\u1eb7t xu\u1ea5t \u1ea3nh (export setting) kh\u00e1c nhau.<\/p>\n\n\n\n<p>Trong h\u1ea7u h\u1ebft c\u00e1c ph\u1ea7n m\u1ec1m x\u1eed l\u00fd \u1ea3nh, \u0111\u1ecbnh d\u1ea1ng JPEG \u0111\u01b0\u1ee3c t\u1ea1o khi b\u1ea1n l\u01b0u (save) s\u1ebd \u0111\u01b0\u1ee3c \u0111\u1ec3 \u1edf ch\u1ebf \u0111\u1ed9 Baseline (\u0111\u01b0\u1eddng c\u01a1 s\u1edf). N\u00f3i m\u1ed9t c\u00e1ch ng\u1eafn g\u1ecdn, c\u00e1ch t\u1ed1t nh\u1ea5t khi h\u00ecnh dung v\u1ec1 \u1ea3nh baseline l\u00e0 \u1ea3nh b\u1eaft \u0111\u1ea7u t\u1ea3i t\u1eeb tr\u00ean c\u00f9ng v\u00e0 n\u00f3 \u0111\u01b0\u1ee3c di\u1ec5n gi\u1ea3i (interpreted) theo t\u1eebng d\u00f2ng. T\u1eebng pixel \u1ea3nh \u0111\u01b0\u1ee3c n\u00e9n ho\u1eb7c\/v\u00e0<em> hi\u1ec3n th\u1ecb theo t\u1eebng d\u00f2ng<\/em> t\u1eeb tr\u00ean xu\u1ed1ng d\u01b0\u1edbi.<\/p>\n\n\n\n<p>Tr\u00e1i l\u1ea1i \u1ea3nh JPEG progressive s\u1ebd th\u1ef1c s\u1ef1 hi\u1ec3n th\u1ecb to\u00e0n b\u1ed9 b\u1ee9c \u1ea3nh ngay l\u1eadp t\u1ee9c. \u0110\u00e1nh \u0111\u1ed5i \u1edf \u0111\u00e2y l\u00e0 n\u00f3 ch\u1ec9 t\u1ea3i m\u1ed9t ph\u1ea7n d\u1eef li\u1ec7u \u1ea3nh t\u1ea1i m\u1ed9t th\u1eddi \u0111i\u1ec3m. \u0110i\u1ec1u n\u00e0y c\u00f3 ngh\u0129a l\u00e0 \u1ea3nh s\u1ebd t\u1ea3i \u1edf k\u00edch c\u1ee1 \u0111\u1ea7y \u0111\u1ee7 v\u00e0 s\u1ebd hi\u1ec3n th\u1ecb r\u00f5 r\u00e0ng d\u1ea7n d\u1ea7n (trong khi \u1ea3nh baseline s\u1ebd hi\u1ec3n th\u1ecb r\u00f5 lu\u00f4n nh\u01b0ng l\u1ea1i ch\u1ec9 t\u1eebng d\u00f2ng).<\/p>\n\n\n\n<hr class=\"wp-block-separator has-css-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"2_Quan_sat_trong_thuc_te\"><\/span>#2. Quan s\u00e1t trong th\u1ef1c t\u1ebf<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>\u0110\u00f4i khi c\u00e1ch t\u1ed1t nh\u1ea5t \u0111\u1ec3 hi\u1ec3u \u0111i\u1ec1u g\u00ec \u0111\u00f3 l\u00e0 xem c\u00e1ch n\u00f3 ho\u1ea1t \u0111\u1ed9ng nh\u01b0 th\u1ebf n\u00e0o trong th\u1ef1c t\u1ebf. V\u00ec th\u1ebf ch\u00fang t\u00f4i t\u1ea1o hai \u1ea3nh gi\u1ed1ng y nhau \u0111\u01b0\u1ee3c l\u01b0u \u1edf hai \u0111\u1ecbnh d\u1ea1ng JPEG kh\u00e1c nhau \u0111\u1ec3 ti\u1ec7n so s\u00e1nh.<\/p>\n\n\n\n<p>V\u00ec th\u1ebf ch\u00fang t\u00f4i b\u1eaft \u0111\u1ea7u ki\u1ebfm m\u1ed9t \u1ea3nh ch\u1ea5t l\u01b0\u1ee3ng cao \u0111\u1ec3 ki\u1ec3m tra; trong tr\u01b0\u1eddng h\u1ee3p n\u00e0y ch\u00fang t\u00f4i s\u1eed d\u1ee5ng b\u1ee9c \u1ea3nh hai ch\u00fa m\u00e8o \u0111ang lim dim tr\u00ean trang \u1ea3nh mi\u1ec5n ph\u00ed <a href=\"https:\/\/www.pexels.com\/vi-vn\/\" target=\"_blank\" rel=\"noreferrer noopener\">pexels.com<\/a><\/p>\n\n\n\n<p>V\u00ec \u1ea3nh c\u00f3 \u0111\u1ed9 ph\u00e2n gi\u1ea3i cao, ch\u00fang t\u00f4i gi\u1ea3m k\u00edch c\u1ee1 c\u1ee7a n\u00f3 xu\u1ed1ng m\u1ed9t ch\u00fat tr\u01b0\u1edbc khi th\u1ef1c hi\u1ec7n ki\u1ec3m tra, ch\u00fang t\u00f4i gi\u1ea3m \u0111i m\u1ed9t n\u1eeda. Gi\u1edd k\u00edch c\u1ee1 \u0111\u00e3 \u0111\u01b0\u1ee3c gi\u1ea3m, ch\u00fang t\u00f4i xu\u1ea5t n\u00f3 ra th\u00e0nh hai phi\u00ean b\u1ea3n \u1ea3nh kh\u00e1c nhau, m\u1ed9t c\u00e1i l\u00e0 baseline v\u00e0 m\u1ed9t c\u00e1i l\u00e0 progressive. C\u1ea3 hai \u1ea3nh \u0111\u1ec1u s\u1eed d\u1ee5ng c\u00f9ng m\u1ed9t c\u00e0i \u0111\u1eb7t ngo\u1ea1i tr\u1eeb kh\u00e1c bi\u1ec7t duy nh\u1ea5t li\u00ean quan \u0111\u1ebfn baseline v\u00e0 progressive, ch\u00fang t\u00f4i s\u1eed d\u1ee5ng <a href=\"https:\/\/www.gimp.org\/\" target=\"_blank\" rel=\"noreferrer noopener\">ph\u1ea7n m\u1ec1m GIMP<\/a> \u0111\u1ec3 t\u1ea1o (xu\u1ea5t) c\u00e1c \u1ea3nh.<\/p>\n\n\n\n<p><strong>\u0110\u00e2y l\u00e0 \u1ea3nh g\u1ed1c<\/strong><\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-large\"><img decoding=\"async\" src=\"https:\/\/kiencang.net\/wp-content\/uploads\/2020\/04\/anh-jpg-baseline.jpg\" alt=\"\u1ea3nh g\u1ed1c\" class=\"wp-image-15761\"\/><\/figure><\/div>\n\n\n<p><strong>\u1ea2nh JPEG t\u1ea3i theo ki\u1ec3u Baseline<\/strong> s\u1ebd tr\u00f4ng gi\u1ed1ng th\u1ebf n\u00e0y (\u1ea3nh t\u1ea3i theo t\u1eebng d\u00f2ng, nh\u01b0ng m\u1ed7i d\u00f2ng \u0111\u1ec1u \u0111\u1ea7y \u0111\u1ee7 d\u1eef li\u1ec7u):<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-large\"><img decoding=\"async\" src=\"https:\/\/kiencang.net\/wp-content\/uploads\/2020\/04\/jpg-baseline-timeline.jpg\" alt=\"\u1ea3nh JPG t\u1ea3i theo ki\u1ec3u baseline\" class=\"wp-image-15762\"\/><\/figure><\/div>\n\n\n<p><strong>\u1ea2nh JPEG t\u1ea3i theo ki\u1ec3u progessive<\/strong> s\u1ebd tr\u00f4ng gi\u1ed1ng th\u1ebf n\u00e0y (\u1ea3nh t\u1ea3i t\u1ed5ng th\u1ec3 tr\u01b0\u1edbc, nh\u01b0ng c\u00e1c pixel kh\u00f4ng \u0111\u1ea7y \u0111\u1ee7 d\u1eef li\u1ec7u ngay t\u1eeb ban \u0111\u1ea7u nh\u01b0 baseline):<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-large\"><img decoding=\"async\" src=\"https:\/\/kiencang.net\/wp-content\/uploads\/2020\/04\/jpg-progressive-timeline.jpg\" alt=\"\u1ea3nh t\u1ea3i theo ki\u1ec3u progessive\" class=\"wp-image-15763\"\/><\/figure><\/div>\n\n\n<p>D\u00f9 c\u00e1c \u1ea3nh n\u00e0y kh\u00e1 l\u1edbn, \u0111\u00f4i khi th\u1eadt kh\u00f3 \u0111\u1ec3 th\u1ea5y \u0111\u01b0\u1ee3c s\u1ef1 kh\u00e1c bi\u1ec7t gi\u1eefa ch\u00fang trong qu\u00e1 tr\u00ecnh t\u1ea3i v\u1ec1 (nguy\u00ean nh\u00e2n l\u00e0 v\u00ec t\u1ed1c \u0111\u1ed9 \u0111\u01b0\u1eddng truy\u1ec1n n\u00ean \u1ea3nh t\u1ea3i v\u1ec1 nhanh \u0111\u1ebfn n\u1ed7i m\u00e0 m\u1eaft th\u01b0\u1eddng kh\u00f4ng nh\u1eadn ra). Timeline (d\u00f2ng th\u1eddi gian) g\u1ed3m 4 b\u1ee9c h\u00ecnh nh\u1ecf cho th\u1ea5y qu\u00e1 tr\u00ecnh t\u1ea3i \u1ea3nh di\u1ec5n ra nh\u01b0 th\u1ebf n\u00e0o. C\u1ea7n nh\u1edb r\u1eb1ng timeline l\u00e0 c\u00e1ch quay ch\u1eadm \u0111\u1ec3 l\u00e0m n\u1ed5i b\u1eadt \u00fd t\u01b0\u1edfng m\u00e0 th\u00f4i. \u0110\u1ec3 nh\u00ecn \u0111\u01b0\u1ee3c r\u00f5 h\u01a1n qu\u00e1 tr\u00ecnh t\u1ea3i v\u1ec1 b\u1ea1n c\u1ea7n v\u00f4 hi\u1ec7u h\u00f3a cache. Tr\u00ean Chrome b\u1ea1n c\u00f3 th\u1ec3 l\u00e0m \u0111i\u1ec1u \u0111\u00f3 b\u1eb1ng c\u00e1ch nh\u1ea5n t\u1ed5 h\u1ee3p ph\u00edm<em> Ctrl + Shift + I<\/em> &gt; <em>Networks<\/em> &gt; <em>Disable cache <\/em>&gt; \u1edf b\u00ean tr\u00e1i b\u1ea1n ch\u1ecdn online (*) r\u1ed3i nh\u1ea5n F5 \u0111\u1ec3 t\u1ea3i l\u1ea1i trang:<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" src=\"https:\/\/kiencang.net\/wp-content\/uploads\/2020\/04\/kiem-tra-tai-anh.png\" alt=\"\" class=\"wp-image-15767\"\/><\/figure>\n\n\n\n<p>(*): M\u1eb7c d\u00f9 v\u1ec1 l\u00fd thuy\u1ebft ch\u1ecdn Mid-tier mobile ho\u1eb7c Low-tier mobile \u0111\u1ec3 m\u00f4 ph\u1ecfng k\u1ebft n\u1ed1i ch\u1eadm tr\u00ean di \u0111\u1ed9ng s\u1ebd d\u1ec5 quan s\u00e1t qu\u00e1 tr\u00ecnh t\u1ea3i \u1ea3nh v\u1ec1 h\u01a1n, nh\u01b0ng th\u1ef1c t\u1ebf b\u1ea1n n\u00ean th\u1eed c\u1ea3 online n\u1eefa \u0111\u1ec3 quan s\u00e1t c\u00e1c tr\u1ea1ng th\u00e1i kh\u00e1c nhau.<\/p>\n\n\n\n<p>Ngo\u00e0i vi\u1ec7c d\u00f9ng m\u1eaft th\u01b0\u1eddng \u0111\u1ec3 ki\u1ec3m tra b\u1eb1ng c\u00e1ch m\u00f4 ph\u1ecfng nh\u01b0 tr\u00ean, b\u1ea1n c\u00f3 th\u1ec3 s\u1eed d\u1ee5ng c\u00f4ng c\u1ee5 tr\u1ef1c tuy\u1ebfn sau \u0111\u1ec3 test \u1ea3nh, n\u00f3 s\u1ebd cho b\u1ea1n bi\u1ebft \u1ea3nh JPEG \u0111ang d\u00f9ng l\u00e0 \u0111\u1ecbnh d\u1ea1ng g\u00ec: <a href=\"https:\/\/www.imgonline.com.ua\/eng\/progressive-or-baseline-jpeg.php\" target=\"_blank\" rel=\"noreferrer noopener\">https:\/\/www.imgonline.com.ua\/eng\/progressive-or-baseline-jpeg.php<\/a><\/p>\n\n\n\n<p>C\u00e1c \u0111\u01b0\u1eddng d\u1eabn \u0111\u1ec3 b\u1ea1n ki\u1ec3m tra c\u00e1ch t\u1ea3i \u1ea3nh:<\/p>\n\n\n\n<ul>\n<li>\u1ea2nh baseline:&nbsp;<a href=\"https:\/\/static.kiencang.net\/2020\/anh-baseline.html\" target=\"_blank\" rel=\"noreferrer noopener\">https:\/\/static.kiencang.net\/2020\/anh-baseline.html<\/a><\/li>\n\n\n\n<li>\u1ea2nh progressive:&nbsp;<a href=\"https:\/\/static.kiencang.net\/2020\/anh-progressive.html\" target=\"_blank\" rel=\"noreferrer noopener\">https:\/\/static.kiencang.net\/2020\/anh-progressive.html<\/a><\/li>\n<\/ul>\n\n\n\n<p>B\u1ea1n n\u00ean \u0111\u1ec3 khung b\u00ean tr\u00e1i to cho d\u1ec5 quan s\u00e1t, gi\u1ed1ng nh\u01b0 th\u1ebf n\u00e0y:<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" src=\"https:\/\/kiencang.net\/wp-content\/uploads\/2020\/04\/kiem-tra-lighthouse-1024x475.png\" alt=\"ki\u1ec3m tra qu\u00e1 tr\u00ecnh t\u1ea3i \u1ea3nh tr\u00ean Lighthouse\" class=\"wp-image-15778\"\/><\/figure>\n\n\n\n<hr class=\"wp-block-separator has-css-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"3_Tai_sao_anh_progressive_lai_tot_hon_baseline\"><\/span>#3. T\u1ea1i sao \u1ea3nh progressive l\u1ea1i t\u1ed1t h\u01a1n baseline<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>V\u1ea5n \u0111\u1ec1 c\u1ee7a \u1ea3nh baseline l\u00e0 n\u00f3 kh\u00f4ng cho ng\u01b0\u1eddi d\u00f9ng th\u1ea5y tr\u01b0\u1edbc \u0111\u01b0\u1ee3c h\u00ecnh d\u1ea1ng t\u1ed5ng quan c\u1ee7a h\u00ecnh \u1ea3nh, ng\u01b0\u1eddi d\u00f9ng th\u00e0 th\u1ea5y m\u1ed9t \u1ea3nh m\u1edd tr\u01b0\u1edbc c\u00f2n h\u01a1n th\u1ea5y \u1ea3nh ch\u1ec9 t\u1ea3i \u0111\u01b0\u1ee3c m\u1ed9t ph\u1ea7n nh\u1ecf. B\u1ea1n h\u00e3y quan s\u00e1t hai h\u00ecnh b\u00ean d\u01b0\u1edbi \u0111\u00e2y v\u00e0 t\u1ef1 c\u1ea3m nh\u1eadn:<\/p>\n\n\n\n<p>D\u00f9 r\u1ea5t n\u00e9t, \u1ea3nh ch\u1ec9 t\u1ea3i \u0111\u01b0\u1ee3c m\u1ed9t ph\u1ea7n (ng\u01b0\u1eddi d\u00f9ng ch\u1ec9 bi\u1ebft \u1ea3nh n\u00e0y c\u00f3 hoa v\u00e0 m\u1ed9t con v\u1eadt g\u00ec \u0111\u00f3 c\u00f3 m\u1ecf):<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-large\"><img decoding=\"async\" src=\"https:\/\/kiencang.net\/wp-content\/uploads\/2020\/04\/anh-tai-baseline.png\" alt=\"\u1ea3nh baseline \u0111ang trong qu\u00e1 tr\u00ecnh t\u1ea3i\" class=\"wp-image-15782\"\/><\/figure><\/div>\n\n\n<p>\u1ea2nh t\u1ea3i to\u00e0n b\u1ed9, d\u00f9 h\u01a1i m\u1edd (ng\u01b0\u1eddi d\u00f9ng bi\u1ebft \u0111\u01b0\u1ee3c c\u00f3 m\u1ed9t con chim \u0111\u1eadu tr\u00ean c\u00e0nh hoa):<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-large\"><img decoding=\"async\" src=\"https:\/\/kiencang.net\/wp-content\/uploads\/2020\/04\/anh-tai-progressive-min.jpeg\" alt=\"\u1ea3nh progressive \u0111ang trong qu\u00e1 tr\u00ecnh t\u1ea3i\" class=\"wp-image-15783\"\/><\/figure><\/div>\n\n\n<p>S\u1ef1 kh\u00e1c bi\u1ec7t \u1edf \u0111\u00e2y l\u00e0 <strong>th\u00f4ng tin<\/strong>, v\u1edbi c\u00f9ng m\u1ed9t l\u01b0\u1ee3ng d\u1eef li\u1ec7u \u1ea3nh progressive cho ng\u01b0\u1eddi d\u00f9ng nhi\u1ec1u th\u00f4ng tin, \u00fd ngh\u0129a c\u1ee7a b\u1ee9c h\u00ecnh h\u01a1n so v\u1edbi baseline.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-css-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"4_Minh_hoa_bang_do_hoa_dong_theo_thoi_gian_thuc\"><\/span>#4. Minh h\u1ecda b\u1eb1ng \u0111\u1ed3 h\u1ecda \u0111\u1ed9ng theo th\u1eddi gian th\u1ef1c<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>H\u00e3y xem \u0111\u1ed3 h\u1ecda \u0111\u1ed9ng v\u1ec1 c\u00e1ch t\u1ea3i c\u1ee7a \u1ea3nh progressive (\u1ea3nh n\u00e9t d\u1ea7n d\u1ea7n):<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-large\"><img decoding=\"async\" src=\"https:\/\/kiencang.net\/wp-content\/uploads\/2020\/04\/cach-tai-progressive.gif\" alt=\"\u1ea3nh \u0111\u1ed9ng t\u1ea3i ki\u1ec3u progressive\" class=\"wp-image-15784\"\/><\/figure><\/div>\n\n\n<p>C\u00f2n \u0111\u00e2y l\u00e0 \u0111\u1ed3 h\u1ecda \u0111\u1ed9ng v\u1ec1 c\u00e1ch t\u1ea3i \u1ea3nh baseline:<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-large\"><img decoding=\"async\" src=\"https:\/\/kiencang.net\/wp-content\/uploads\/2020\/04\/baseline-jpeg-film.gif\" alt=\"\u1ea3nh \u0111\u1ed9ng v\u1ec1 baseline\" class=\"wp-image-15792\"\/><\/figure><\/div>\n\n\n<p>P\/S 1: Trong th\u1ef1c t\u1ebf t\u00f4i quan s\u00e1t th\u1ea5y kh\u00f4ng ph\u1ea3i ngay t\u1eeb ban \u0111\u1ea7u \u1ea3nh progressive hi\u1ec3n th\u1ecb to\u00e0n b\u1ed9 b\u1ee9c h\u00ecnh ngay, m\u00e0 n\u00f3 c\u0169ng hi\u1ec3n th\u1ecb t\u1eebng d\u00f2ng tr\u01b0\u1edbc, nh\u01b0ng qu\u00e1 tr\u00ecnh n\u00e0y di\u1ec5n ra r\u1ea5t nhanh v\u00ec d\u1eef li\u1ec7u chuy\u1ec3n \u0111i nh\u1ecf (c\u00e1c d\u00f2ng d\u1eef li\u1ec7u \u1ea3nh c\u1ee7a n\u00f3 kh\u00f4ng ph\u1ea3i \u0111\u1ea7y \u0111\u1ee7 ngay l\u00fac \u0111\u1ea7u nh\u01b0 baseline, n\u00ean c\u00f3 th\u1ec3 hi\u1ec3n th\u1ecb to\u00e0n b\u1ed9 khung h\u00ecnh nhanh h\u01a1n 5 \u0111\u1ebfn 10 l\u1ea7n). Ngay khi n\u00f3 l\u1ea5p \u0111\u1ea7y khung h\u00ecnh, n\u00f3 s\u1ebd hi\u1ec3n th\u1ecb \u1ea3nh n\u00e9t d\u1ea7n l\u00ean.<\/p>\n\n\n\n<p>P\/S 2: Tr\u00ean c\u00e1c m\u1ea1ng k\u1ebft n\u1ed1i c\u00f3 t\u1ed1c \u0111\u1ed9 cao, qu\u00e1 tr\u00ecnh t\u1ea3i \u1ea3nh di\u1ec5n th\u01b0\u1eddng di\u1ec5n ra nhanh, nh\u1ea5t l\u00e0 tr\u00ean c\u00e1c \u1ea3nh c\u00f3 dung l\u01b0\u1ee3ng trung b\u00ecnh, v\u00e0 b\u1eb1ng m\u1eaft th\u01b0\u1eddng b\u1ea1n kh\u00f3 bi\u1ebft \u0111\u01b0\u1ee3c \u1ea3nh n\u00e0o l\u00e0 baseline, \u1ea3nh n\u00e0o l\u00e0 progressive.<\/p>\n\n\n\n<p>P\/S 3: \u1ede WordPress, nhi\u1ec1u <a href=\"https:\/\/kiencang.net\/plugin-nen-anh-wordpress\/\" target=\"_blank\" rel=\"noreferrer noopener\">plugin n\u00e9n \u1ea3nh<\/a> t\u1ef1 \u0111\u1ed9ng chuy\u1ec3n \u1ea3nh t\u1eeb d\u1ea1ng baseline sang d\u1ea1ng progressive.<\/p>\n\n\n\n<p>P\/S 4: <a href=\"https:\/\/kiencang.net\/anh-lqip\/\" target=\"_blank\" rel=\"noreferrer noopener\">Lazy load \u1ea3nh theo ki\u1ec3u LQIP<\/a> r\u00f5 r\u00e0ng l\u1ea5y \u00fd t\u01b0\u1edfng \u00edt nhi\u1ec1u t\u1eeb JPEG Progressive.<\/p>\n\n\n\n<p>P\/S 5: T\u00f4i kh\u00f4ng r\u00f5 c\u00e1c \u0111\u1ecbnh d\u1ea1ng \u1ea3nh kh\u00e1c, ch\u1eb3ng h\u1ea1n nh\u01b0 PNG c\u00f3 Progressive kh\u00f4ng, v\u1ea5n \u0111\u1ec1 \u0111\u00f3 t\u00f4i s\u1ebd t\u00ecm hi\u1ec3u v\u00e0 gi\u1ea3i \u0111\u00e1p sau.<\/p>\n\n\n\n<p><em>(D\u1ecbch t\u1eeb b\u00e0i vi\u1ebft What is a progressive JPEG? c\u1ee7a t\u00e1c gi\u1ea3 Dan Pock, trang Liquid Web &#8211; ng\u01b0\u1eddi d\u1ecbch c\u00f3 b\u1ed5 sung th\u00eam m\u1ed9t v\u00e0i \u0111o\u1ea1n v\u00e0 h\u00ecnh minh h\u1ecda, \u0111\u1ed3 h\u1ecda \u0111\u1ed9ng cho d\u1ec5 hi\u1ec3u)<\/em><\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u0110\u1ecbnh d\u1ea1ng \u1ea3nh JPEG l\u00e0 m\u1ed9t trong c\u00e1c \u0111\u1ecbnh d\u1ea1ng \u1ea3nh ph\u1ed5 bi\u1ebfn nh\u1ea5t tr\u00ean th\u1ebf gi\u1edbi web (c\u00e1c \u0111\u1ecbnh d\u1ea1ng c\u00f2n l\u1ea1i g\u1ed3m PNG, GIF, SVG). \u0110\u1ecbnh d\u1ea1ng JPEG th\u01b0\u1eddng \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng cho c\u00e1c \u1ea3nh ph\u1ee9c t\u1ea1p, nhi\u1ec1u m\u00e0u s\u1eafc, th\u00ed d\u1ee5 nh\u01b0 \u1ea3nh ch\u1ee5p thi\u00ean nhi\u00ean, con ng\u01b0\u1eddi. \u0110\u1eb7c t\u1ea3 c\u1ee7a JPEG &hellip;<\/p>\n","protected":false},"author":1,"featured_media":24620,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[280],"tags":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v21.6 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>\u1ea2nh JPEG progressive l\u00e0 g\u00ec? N\u00f3 gi\u00fap g\u00ec trong vi\u1ec7c c\u1ea3i thi\u1ec7n tr\u1ea3i nghi\u1ec7m ng\u01b0\u1eddi d\u00f9ng? &#8226; Ki\u1ebfn c\u00e0ng<\/title>\n<meta name=\"description\" content=\"Ki\u1ec3u t\u1ea3i \u1ea3nh progessive c\u1ee7a JPEG t\u00f4i cho l\u00e0 ki\u1ec3u hi\u1ec3n th\u1ecb t\u1ed1t h\u01a1n cho ng\u01b0\u1eddi d\u00f9ng, v\u00ec n\u00f3 hi\u1ec3n th\u1ecb \u1ea3nh to\u00e0n th\u1ec3 tr\u01b0\u1edbc r\u1ed3i hi\u1ec7n r\u00f5 l\u00ean d\u1ea7n sau, h\u00e3y xem n\u00f3 kh\u00e1c bi\u1ec7t th\u1ebf n\u00e0o v\u1edbi \u1ea3nh baseline.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/kiencang.net\/anh-jpeg-progressive-la-gi\/\" \/>\n<meta property=\"og:locale\" content=\"vi_VN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"\u1ea2nh JPEG progressive l\u00e0 g\u00ec? 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