{"id":2409,"date":"2018-04-17T12:58:07","date_gmt":"2018-04-17T10:58:07","guid":{"rendered":"https:\/\/www.plus.hr\/blog\/?p=2409"},"modified":"2026-11-03T16:30:19","modified_gmt":"2026-11-03T15:30:19","slug":"optimizacija-slika-za-web-progressive-jpeg","status":"publish","type":"post","link":"https:\/\/www.plus.hr\/blog\/2018\/04\/17\/optimizacija-slika-za-web-progressive-jpeg\/","title":{"rendered":"Optimizacija slika za web &#8211; progressive JPEG"},"content":{"rendered":"<p><strong>JPEG<\/strong> je vrlo popularna i \u010desto kori\u0161tena metoda za <strong><em>lossy<\/em> kompresiju<\/strong> (sa\u017eimanje podataka s gubicima) digitalnih slika. Prednost je mogu\u0107nost pode\u0161avanja razine kompresije ovisno o tome \u017eelite li zadr\u017eati vi\u0161u kvalitetu slike ili vam je ipak bitnija veli\u010dina datoteke te prostor koji \u0107e zauzeti na disku.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-2410 size-full\" src=\"https:\/\/www.plus.hr\/blog\/wp-content\/uploads\/2018\/04\/progressivejpg-1.jpg\" alt=\"jpeg lossy kompresija\" width=\"768\" height=\"333\" \/><\/p>\n<h2>Kvaliteta slike na webu<\/h2>\n<p>Upravo zbog mogu\u0107nosti pode\u0161avanja kompresije prema potrebama korisnika, JPEG je naj\u010de\u0161\u0107e kori\u0161ten format za spremanje slika na webu. Koristi ga\u00a0<a href=\"https:\/\/w3techs.com\/technologies\/details\/im-jpeg\/all\/all\">vi\u0161e od 70% svih web stranica na Internetu<\/a>.<\/p>\n<p>Kvaliteta i veli\u010dina slika koje koristite na va\u0161oj web stranici znatno utje\u010du na dojam koji \u0107e va\u0161a stranica ostaviti posjetitelju. Lo\u0161e komprimirane, velike slika mogu jako usporiti rad web stranice. Samim time posjetiteljima mogu ostaviti lo\u0161 dojam. Upravo radi toga, na\u0161im korisnicima preporu\u010dujemo da osim standardne optimizacije svojih stranica pripaze i na slike koje koriste na webu.<\/p>\n<h3>Koja je razlika izme\u0111u baseline i progressive JPEG formata?<\/h3>\n<p>Slike se generalno u\u010ditavaju od gore prema dolje, format koji je poznat pod nazivom <strong>baseline JPEG<\/strong>.<\/p>\n<p><strong>Progressive JPEG<\/strong>, za razliku od baseline varijante, omogu\u0107uje prikaz slike u cijelosti, tako da u\u010ditava podatke postepeno. To u praksi zna\u010di da \u0107e se slika korisniku prikazati odmah, ali \u0107e biti mutna i pikselizirana u po\u010detku, pa se onda postepeno u\u010ditati u potpunosti.<\/p>\n<p>Razliku \u0107ete najlak\u0161e shvatiti\u00a0na primjerima ispod.<\/p>\n<p>Prvi primjer je prikaz u\u010ditavanja baseline JPEG-a &#8211; u\u010ditava se dio po dio, dok se cijela slika na kraju ne prika\u017ee.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-2411 size-full\" src=\"https:\/\/www.plus.hr\/blog\/wp-content\/uploads\/2018\/04\/baseline_ucitavanje.jpg\" alt=\"baseline JPEG\" width=\"768\" height=\"298\" \/><\/p>\n<p>Drugi primjer je progressive JPEG &#8211; slika je odmah vidljiva, iako mutno. Izo\u0161trava se u\u010ditavanjem ostatka podataka sve dok se slika ne prika\u017ee u cijelosti.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-2412 size-full\" src=\"https:\/\/www.plus.hr\/blog\/wp-content\/uploads\/2018\/04\/progressive-ucitavanje.jpg\" alt=\"progressive JPEG\" width=\"768\" height=\"298\" \/><\/p>\n<h3>Kako progressive JPEG poma\u017ee u optimizaciji web stranice?<\/h3>\n<p>Kod sporijeg u\u010ditavanja baseline slika, prostor gdje se slika nalazi je do zavr\u0161etka u\u010ditavanja prazan, \u0161to korisniku automatski daje dojam da je stranica spora. Progressive <strong>JPEG<\/strong> pru\u017ea bolje vizualno iskustvo za korisnike, to\u010dnije, iako brzina u\u010ditavanja mo\u017eda i je ista, korisnik ima dojam da se stranica prije u\u010ditala.<\/p>\n<p>Progressive JPEG slike su tako\u0111er ne\u0161to manje. To zna\u010di da \u0107e se koristiti manje bandwidtha i manje prostora na serveru. U kona\u010dnici, to je vrlo korisno za shared hosting korisnike.<\/p>\n<p>Iako velika ve\u0107ina modernih preglednika podr\u017eava progressive JPEG, treba imati na umu da ga neki preglednici ne podr\u017eavaju (primjerice IE8). Ako ga preglednik ne podr\u017eava, slike \u0107e se prikazati korisnicima, no tek kada se cijela datoteka u\u010dita.<\/p>\n<h3>Kako\u00a0optimizirati slike na webu pomo\u0107u progressive JPEG-a?<\/h3>\n<p>Idealno bi bilo da sve ve\u0107e slike na stranici zamijenite njihovom progressive varijantom. Ve\u0107ina alata za obradu slika, poput <strong>Photoshopa<\/strong> ili <strong>Gimpa<\/strong>, omogu\u0107uje lako prebacivanje slike u progressive model.<\/p>\n<p>Photoshop je nedavno zakomplicirao stvari tako \u0161to je od 2015 na dalje uklonio opciju spremanja slika kao progressive <strong>JPEG. <\/strong>To je i dalje mogu\u0107e pomo\u0107u &#8220;Save for web&#8221; opcije.\u00a0Za spremiti sliku u novijim verzijama Photoshopa potrebno je kliknuti na File -&gt; Export -&gt; Save for Web (legacy), te odabrati &#8220;Progressive&#8221; opciju.<\/p>\n<p>Osim navedenog, postoje i neke dodatne opcije koje su vam dostupne, poput\u00a0<a href=\"https:\/\/kraken.io\/\">Kraken.io<\/a> alata (koji je dostupan i u obliku WordPress plugina), ili Optimizille, koje omogu\u0107uju brzu i efikasnu konverziju slika u progressive model.<\/p>\n<p>Svakako preporu\u010dujemo da kod optimizacije va\u0161e web stranice uzmete navedeno u obzir, te poradite na\u00a0fotografijama i slikama koje predstavljate svojim posjetiteljima, upravo kako bi njihovo iskustvo bilo \u0161to ugodnije.<\/p>\n<p class=\"entry-title\"><a href=\"https:\/\/www.plus.hr\/blog\/2018\/07\/02\/kako-pripremiti-vas-wordpress-za-povecanu-posjecenost\/\">Pro\u010ditajte<\/a> kako mo\u017eete pripremiti va\u0161 WordPress za pove\u0107anu posje\u0107enost gdje spominjemo i va\u017enost optimizacije slika.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>JPEG je vrlo popularna i \u010desto kori\u0161tena metoda za lossy kompresiju (sa\u017eimanje podataka s gubicima) digitalnih slika. Prednost je mogu\u0107nost pode\u0161avanja razine kompresije ovisno o tome \u017eelite li zadr\u017eati vi\u0161u kvalitetu slike ili vam je ipak bitnija veli\u010dina datoteke te prostor koji \u0107e zauzeti na disku. Kvaliteta slike na webu Upravo zbog mogu\u0107nosti pode\u0161avanja kompresije [&hellip;]<\/p>\n","protected":false},"author":2,"featured_media":2406,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[15],"tags":[54,119,176,258,275],"class_list":["post-2409","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-izrada-web-stranica","tag-cms","tag-hosting","tag-optimizacija","tag-web-design","tag-wordpress"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.8 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Optimizacija slika za web - progressive JPEG - Plus Hosting<\/title>\n<meta name=\"description\" content=\"JPEG je vrlo popularna i \u010desto kori\u0161tena metoda za sa\u017eimanje podataka digitalnih slika. 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