[{"@context":"https:\/\/schema.org\/","@type":"Article","@id":"https:\/\/www.rahman.cz\/jak-zrychlit-nacitani-stranek-pomoci-komprese-obrazku\/#Article","mainEntityOfPage":"https:\/\/www.rahman.cz\/jak-zrychlit-nacitani-stranek-pomoci-komprese-obrazku\/","headline":"Jak zrychlit na\u010d\u00edt\u00e1n\u00ed str\u00e1nek pomoc\u00ed komprese obr\u00e1zk\u016f","name":"Jak zrychlit na\u010d\u00edt\u00e1n\u00ed str\u00e1nek pomoc\u00ed komprese obr\u00e1zk\u016f","description":"Na\u010d\u00edt\u00e1 se va\u0161e webov\u00e1 str\u00e1nka p\u0159\u00edli\u0161 pomalu? M\u016f\u017ee to m\u00edt nejr\u016fzn\u011bj\u0161\u00ed d\u016fvody. Jedn\u00edm z nej\u010dast\u011bj\u0161\u00edch b\u00fdv\u00e1 velikost obr\u00e1zk\u016f. \u00a0 Nen\u00ed […]","datePublished":"2019-06-04","dateModified":"2019-06-04","author":{"@type":"Person","@id":"https:\/\/www.rahman.cz\/author\/#Person","name":"","url":"https:\/\/www.rahman.cz\/author\/","identifier":1,"image":{"@type":"ImageObject","@id":"https:\/\/secure.gravatar.com\/avatar\/831abbcc684823965c5caa39ae4561083127c8aedfe9e524c6cecc176998c733?s=96&d=mm&r=g","url":"https:\/\/secure.gravatar.com\/avatar\/831abbcc684823965c5caa39ae4561083127c8aedfe9e524c6cecc176998c733?s=96&d=mm&r=g","height":96,"width":96}},"publisher":{"@type":"Organization","name":"rahman.cz","logo":{"@type":"ImageObject","@id":"\/logo.png","url":"\/logo.png","width":600,"height":60}},"image":{"@type":"ImageObject","@id":"https:\/\/www.rahman.cz\/wp-content\/uploads\/img_a346942_w2932_t1561215810.jpg","url":"https:\/\/www.rahman.cz\/wp-content\/uploads\/img_a346942_w2932_t1561215810.jpg","height":0,"width":0},"url":"https:\/\/www.rahman.cz\/jak-zrychlit-nacitani-stranek-pomoci-komprese-obrazku\/","wordCount":389,"articleBody":"Na\u010d\u00edt\u00e1 se va\u0161e webov\u00e1 str\u00e1nka p\u0159\u00edli\u0161 pomalu? M\u016f\u017ee to m\u00edt nejr\u016fzn\u011bj\u0161\u00ed d\u016fvody. Jedn\u00edm z nej\u010dast\u011bj\u0161\u00edch b\u00fdv\u00e1 velikost obr\u00e1zk\u016f.\u00a0Nen\u00ed se \u010demu divit. Obr\u00e1zky, co se datov\u00e9ho objemu t\u00fd\u010de, zpravidla tvo\u0159\u00ed nejv\u011bt\u0161\u00ed \u010d\u00e1st webu. Jejich objem v\u0161ak lze snadno sn\u00ed\u017eit vhodnou kompres\u00ed.\tJak na kompresi obr\u00e1zku?P\u0159ed ulo\u017een\u00edm obr\u00e1zku ve form\u00e1tu JPG m\u016f\u017eeme zvolit jeho m\u00edru komprese. \u010c\u00edm vy\u0161\u0161\u00ed procento zvol\u00edme, t\u00edm men\u0161\u00ed velikosti dos\u00e1hneme.\u00a0Na prvn\u00ed pohled by se tedy mohlo zd\u00e1t, \u017ee sta\u010d\u00ed pou\u017e\u00edt co nejv\u011bt\u0161\u00ed procento a probl\u00e9m bude vy\u0159e\u0161en. Nem\u011bli bychom v\u0161ak zapom\u00ednat na jednu v\u011bc. \u010c\u00edm v\u00edce soubor zmen\u0161\u00edme, o to v\u00edce sn\u00ed\u017e\u00edme jeho v\u00fdslednou kvalitu.\u00a0Ulo\u017e\u00edme-li jej p\u0159ibli\u017en\u011b v 80% kvalit\u011b, pravd\u011bpodobn\u011b pouh\u00fdm okem nepozn\u00e1me \u017e\u00e1dn\u00fd rozd\u00edl oproti origin\u00e1lu. V z\u00e1vislosti na kvalit\u011b obr\u00e1zku lze zkusit nastavit je\u0161t\u011b vy\u0161\u0161\u00ed procento. V n\u011bkter\u00fdch p\u0159\u00edpadech si m\u016f\u017eeme dovolit i p\u0159ekro\u010dit hranici 50 %, ani\u017e by to m\u011blo negativn\u00ed vliv na jeho v\u00fdslednou podobu.\u00a0V\u00fd\u0161e zm\u00edn\u011bnou metodu umo\u017e\u0148uje prakticky v ka\u017ed\u00fd grafick\u00fd editor. Existuje v\u0161ak je\u0161t\u011b jedna relativn\u011b nov\u00e1 metoda – Guetzli algoritmus. Jak funguje?\u00a0D\u00edky t\u00e9to metod\u011b lze grafick\u00e9 soubory upravovat takov\u00fdm zp\u016fsobem, \u017ee sn\u00ed\u017e\u00edme jejich datovou velikost o 30 – 50 % v\u00edce ne\u017e p\u0159i pou\u017eit\u00ed klasick\u00e9 komprese. Co v\u0161ak pravd\u011bpodobn\u011b tak\u00e9 ocen\u00edte, je fakt, \u017ee p\u0159i tomto postupu t\u00e9m\u011b\u0159 nedoch\u00e1z\u00ed ke ztr\u00e1t\u011b kvality.\u00a0Tento algoritmus v\u0161ak nenajdeme v \u017e\u00e1dn\u00e9m z tradi\u010dn\u00edch grafick\u00fdch editor\u016f. D\u016fvodem je jeho n\u00e1ro\u010dnost na procesor po\u010d\u00edta\u010de. Fotografie o velikosti n\u011bkolika megabyt\u016f pot\u0159ebuje minim\u00e1ln\u011b n\u011bkolik minut, aby byla kompletn\u011b zpracov\u00e1na.\u00a0Pokud tedy na svou str\u00e1nku denn\u011b p\u0159id\u00e1v\u00e1te t\u0159eba des\u00edtky fotografi\u00ed, z\u0159ejm\u011b pro v\u00e1s bude lep\u0161\u00ed pou\u017e\u00edt prvn\u011b zm\u00edn\u011bnou metodu. Pro nej\u010dast\u011bji nav\u0161t\u011bvovan\u00e9 sekce webu, jako nap\u0159\u00edklad homepage, se v\u0161ak vyplat\u00ed kompresi nepodcenit a vyu\u017e\u00edt p\u0159ednosti Guetzli algoritmu.                                                                                                                                                                                                                                                                                                                                                                                                "},{"@context":"https:\/\/schema.org\/","@type":"BreadcrumbList","itemListElement":[{"@type":"ListItem","position":1,"name":"Jak zrychlit na\u010d\u00edt\u00e1n\u00ed str\u00e1nek pomoc\u00ed komprese obr\u00e1zk\u016f","item":"https:\/\/www.rahman.cz\/jak-zrychlit-nacitani-stranek-pomoci-komprese-obrazku\/#breadcrumbitem"}]}]