Takmer v\u0161etky odvetvia pr\u00e1ce s po\u010d\u00edta\u010dom si vy\u017eaduj\u00fa pou\u017e\u00edvanie obr\u00e1zkov – ovl\u00e1danie webu, dizajn, tvorba prezent\u00e1ci\u00ed at\u010f. A samozrejme, ka\u017ed\u00fd pozn\u00e1 a \u010dasto sa stret\u00e1va s form\u00e1tom obr\u00e1zkov JPEG.<\/p>\n\n\n\n
Existuje mnoho grafick\u00fdch form\u00e1tov, ktor\u00e9 sa tak \u010di onak l\u00ed\u0161ia. Niektor\u00e9 form\u00e1ty boli v skuto\u010dnosti vytvoren\u00e9 na splnenie praktickej \u0161pecifickej \u00falohy, ktor\u00fa dostupn\u00e9 mo\u017enosti nedok\u00e1zali vyrie\u0161i\u0165. Napr\u00edklad pred pr\u00edchodom form\u00e1tu JPEG zaberali obrazov\u00e9 s\u00fabory pr\u00edli\u0161 ve\u013ea \u00falo\u017en\u00e9ho priestoru. Kv\u00f4li tomu bolo potrebn\u00e9 vytvori\u0165 form\u00e1t, ktor\u00fd by ich optimalizoval.<\/p>\n\n\n\n
S form\u00e1tom JPEG alebo JPG sa u\u017e pravdepodobne stretol ka\u017ed\u00fd z v\u00e1s a mo\u017eno v\u00e1s zauj\u00edmalo, ak\u00fd je medzi nimi rozdiel. Faktom v\u0161ak je, \u017ee niektor\u00e9 form\u00e1ty boli vytvoren\u00e9 na vyhladenie probl\u00e9mu so s\u00fabormi, ke\u010f si s nimi p\u00f4vodn\u00e9 form\u00e1ty nevedeli poradi\u0165. V podstate s\u00fa si v\u0161ak form\u00e1ty jpeg a .jpg ve\u013emi podobn\u00e9.<\/p>\n\n\n\n
Tu by ste mali vedie\u0165 o form\u00e1te JPEG a rozdiele medzi form\u00e1tmi JPEG a JPG.<\/p>\n\n\n\n
Tento form\u00e1t bol pomenovan\u00fd pod\u013ea podv\u00fdboru, ktor\u00fd pom\u00e1hal vytvori\u0165 \u0161tandard JPEG Interchange Format (JIF). Medzin\u00e1rodn\u00e1 organiz\u00e1cia pre normaliz\u00e1ciu (ISO) bola prv\u00fdkr\u00e1t vyhl\u00e1sen\u00e1 v roku 1992.<\/p>\n\n\n\n
Ak m\u00e1me hovori\u0165 o technickej \u010dasti, tak JPEG s\u00fa 24-bitov\u00e9 rastrov\u00e9 obr\u00e1zky s \u00f4smimi bitmi v ka\u017edom kan\u00e1li farebn\u00e9ho modelu RGB. T\u00fdm nezost\u00e1va priestor pre alfa kan\u00e1l, \u010do znamen\u00e1, \u017ee Jpeg m\u00f4\u017ee podporova\u0165 viac ako 16 mili\u00f3nov farieb. Na rozdiel od nich v\u0161ak nem\u00f4\u017eu podporova\u0165 prieh\u013eadnos\u0165.<\/p>\n\n\n\n
Ke\u010f ulo\u017e\u00edte obr\u00e1zok vo form\u00e1te Jpeg, zo s\u00faboru sa odstr\u00e1nia niektor\u00e9 nepodstatn\u00e9 detaily. Mnoh\u00ed to poznaj\u00fa ako kompresiu s\u00faboru. Pri ukladan\u00ed s\u00faboru teda zaber\u00e1 50 a viac percent miesta vo va\u0161om zariaden\u00ed. Dobrou spr\u00e1vou je, \u017ee strata tejto kvality nie je v\u00f4bec badate\u013en\u00e1.<\/p>\n\n\n\n
V skuto\u010dnosti je kompresia JPEG zalo\u017een\u00e1 na technike stratovej kompresie obrazu, ktor\u00e1 m\u00e1 n\u00e1zov diskr\u00e9tna kos\u00ednusov\u00e1 transform\u00e1cia <\/strong>(DCT) a ktor\u00fa prv\u00fdkr\u00e1t pou\u017eil elektrotechnick\u00fd in\u017einier Nasir Ahmed v roku 1972.<\/p>\n\n\n\n Kedysi d\u00e1vno, ke\u010f syst\u00e9m Windows e\u0161te len z\u00edskaval popularitu, mal svoje vlastn\u00e9 funkcie a syst\u00e9m mal maxim\u00e1lne trojp\u00edsmenov\u00fd limit na d\u013a\u017eku pr\u00edpon s\u00faborov. Preto bol Jpeg skr\u00e1ten\u00fd na JPG, aby sp\u013a\u0148al po\u017eiadavky.<\/p>\n\n\n\n Na druhej strane konkuren\u010dn\u00e9 syst\u00e9my Windows, ako napr\u00edklad Mac a Linux, mali t\u00fa v\u00fdhodu, \u017ee nemali tak\u00e9to obmedzenia. Preto na\u010falej pou\u017e\u00edvali s\u00fabory JPEG. Nesk\u00f4r, ke\u010f sa objavili programy na \u00fapravu fotografi\u00ed, ako napr\u00edklad Photoshop a \u010fal\u0161ie podobn\u00e9, za\u010dali pou\u017e\u00edva\u0165 JPG, aby sa vyhli zm\u00e4tkom.<\/p>\n\n\n\n Na svete s\u00fa teda teraz dva rovnak\u00e9 form\u00e1ty obr\u00e1zkov pod dvoma podobn\u00fdmi n\u00e1zvami.<\/p>\n\n\n\n S\u00fabory JIF m\u00f4\u017eete pova\u017eova\u0165 za implement\u00e1ciu form\u00e1tu JPEG v jeho p\u00f4vodnej podobe. Tento form\u00e1t sa v\u0161ak u\u017e nepou\u017e\u00edva, preto\u017ee m\u00e1 niektor\u00e9 ne\u0161\u0165astn\u00e9 obmedzenia. Napr\u00edklad defin\u00edcie farieb a pomeru str\u00e1n pixelov v JIF sp\u00f4sobovali probl\u00e9my s kompatibilitou medzi k\u00f3dova\u010dmi a prehliada\u010dmi (dek\u00f3dova\u010dmi).<\/p>\n\n\n\n Na\u0161\u0165astie sa tieto probl\u00e9my nesk\u00f4r vyrie\u0161ili \u010fal\u0161\u00edmi doplnkov\u00fdmi normami zalo\u017een\u00fdmi na JIF. Prv\u00fdm z nich bol form\u00e1t v\u00fdmeny s\u00faborov JPEG (JFIF) a nesk\u00f4r form\u00e1t obrazov\u00fdch s\u00faborov Exif a farebn\u00e9 profily ICC.<\/p>\n\n\n\n A zatia\u013e \u010do JPEG\/JFIF je v s\u00fa\u010dasnosti najob\u013e\u00fabenej\u0161\u00ed form\u00e1t na ukladanie a prenos fotografick\u00fdch sn\u00edmok na internete, JPEG\/Exif je form\u00e1t pre digit\u00e1lne fotoapar\u00e1ty a in\u00e9 zariadenia na sn\u00edmanie obr\u00e1zkov. V\u00e4\u010d\u0161ina \u013eud\u00ed v\u0161ak nevid\u00ed rozdiel medzi t\u00fdmito mo\u017enos\u0165ami a obidve jednoducho naz\u00fdva JPEG.<\/p>\n\n\n\n JPEG sa \u010dasto porovn\u00e1va s PNG, \u010do nie je prekvapuj\u00face, preto\u017ee oba form\u00e1ty sa pou\u017e\u00edvaj\u00fa v dizajne, fotografii at\u010f. Tieto form\u00e1ty boli uveden\u00e9 na trh takmer v rovnakom \u010dase a boli inov\u00e1ciou v oblasti prenosu fotografi\u00ed, obr\u00e1zkov at\u010f. Aj v s\u00fa\u010dasnosti sa v\u0161ak oba form\u00e1ty porovn\u00e1vaj\u00fa. Ak\u00fd je teda rozdiel a ktor\u00fd form\u00e1t je lep\u0161\u00ed?<\/p>\n\n\n\n V\u0161etko z\u00e1vis\u00ed od toho, s ak\u00fdm obr\u00e1zkom pracujete<\/strong>. Ak napr\u00edklad potrebujete ulo\u017ei\u0165 v\u0161eobecn\u00fa fotografiu s vecami, ako s\u00fa v\u00fdtvory, r\u00f4zne zdroje svetla a text\u00fary, potom je najlep\u0161\u00ed form\u00e1t Jpeg. Pri ukladan\u00ed a pren\u00e1\u0161an\u00ed obr\u00e1zka v tomto form\u00e1te sa toti\u017e obr\u00e1zok komprimuje bez v\u00e4\u010d\u0161ej straty kvality. Aspo\u0148 t\u00e1to strata nie je vidite\u013en\u00e1 pre \u013eudsk\u00e9 oko.<\/p>\n\n\n\n Ak v\u0161ak pracujete s obr\u00e1zkom, pri ktorom je d\u00f4le\u017eit\u00e1 dobr\u00e1 kvalita detailov pri zmene ve\u013ekosti obr\u00e1zka (napr\u00edklad na banneroch a r\u00f4znych \u0161t\u00edtkoch s r\u00f4znymi ve\u013ekos\u0165ami), zachovanie ostr\u00fdch hr\u00e1n a oblast\u00ed s jednou farbou – potom potrebujete form\u00e1t PNG.<\/p>\n\n\n\n Ide o to, \u017ee v JPEG bud\u00fa ma\u0165 tak\u00e9to oblasti kompresn\u00e9 artefakty (jemn\u00e9 deform\u00e1cie obrazu sp\u00f4soben\u00e9 kompresiou) a nebud\u00fa vyzera\u0165 celkom presne. A ak pracujete s logami alebo pixelov\u00fdm umen\u00edm, je lep\u0161ie neuklada\u0165 svoju pr\u00e1cu v Jpeg.<\/p>\n\n\n\n V d\u00f4sledku toho sa na za\u010diatku 21. storo\u010dia, ke\u010f sa objavil form\u00e1t JPEG (alias JPG), objavil dopyt po zdie\u013ean\u00ed obr\u00e1zkov a fotografi\u00ed. Internet bol doslova zaplaven\u00fd fotografiami a umeleck\u00fdmi dielami, \u010do pomohlo umelcom a fotografom \u0161\u00edri\u0165 svoje diela. Tento form\u00e1t u\u013eah\u010dil mnoh\u00fdm \u013eu\u010fom tla\u010d a zdie\u013eanie fotografi\u00ed. Teraz u\u017e nie je potrebn\u00e9 vyvol\u00e1va\u0165 fotografie v \u0161peci\u00e1lnych foto\u0161t\u00fadi\u00e1ch, sta\u010d\u00ed posla\u0165 digit\u00e1lnu fotografiu a je to hotov\u00e9.<\/p>\n\n\n\n Hlavn\u00e1 vec, ktor\u00fa si mus\u00edte zapam\u00e4ta\u0165 z toho, \u010do ste \u010d\u00edtali, je, \u017ee JPEG a JPG s\u00fa rovnak\u00e9 form\u00e1ty s\u00faborov. Napriek zm\u00e4tku, ktor\u00fd sp\u00f4sobil JPEG so svojimi mnoh\u00fdmi aktualiz\u00e1ciami a vari\u00e1ciami, bol rozmach digit\u00e1lnych obr\u00e1zkov na internete v polovici 90. rokov nepochybne sp\u00f4soben\u00fd predov\u0161etk\u00fdm n\u00e1stupom tohto grafick\u00e9ho form\u00e1tu.<\/p>\n\n\n\n Ke\u010f sa nabud\u00face chyst\u00e1te exportova\u0165 fotografiu z grafick\u00e9ho editora a zobraz\u00ed sa v\u00e1m dlh\u00fd zoznam dostupn\u00fdch form\u00e1tov, nezabudnite, \u017ee JPEG a JPG je jeden a ten ist\u00fd form\u00e1t.<\/p>\n","protected":false},"excerpt":{"rendered":" Takmer v\u0161etky odvetvia pr\u00e1ce s po\u010d\u00edta\u010dom si vy\u017eaduj\u00fa pou\u017e\u00edvanie obr\u00e1zkov – ovl\u00e1danie webu, dizajn, tvorba prezent\u00e1ci\u00ed at\u010f. A samozrejme, ka\u017ed\u00fd pozn\u00e1 a \u010dasto sa stret\u00e1va s form\u00e1tom obr\u00e1zkov JPEG. \u010co potrebujete vedie\u0165 o rozdieloch medzi form\u00e1tmi JPG a JPEG Existuje mnoho grafick\u00fdch form\u00e1tov, ktor\u00e9 sa tak \u010di onak l\u00ed\u0161ia. Niektor\u00e9 form\u00e1ty boli v skuto\u010dnosti vytvoren\u00e9 […]<\/p>\n","protected":false},"author":1,"featured_media":3355,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"footnotes":""},"categories":[2],"tags":[98,21],"class_list":{"0":"post-3004","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"has-post-thumbnail","7":"category-sprievodcovia","8":"tag-lg-tv","9":"tag-tv"},"_links":{"self":[{"href":"https:\/\/global.tab-tv.com\/sk\/wp-json\/wp\/v2\/posts\/3004","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/global.tab-tv.com\/sk\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/global.tab-tv.com\/sk\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/global.tab-tv.com\/sk\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/global.tab-tv.com\/sk\/wp-json\/wp\/v2\/comments?post=3004"}],"version-history":[{"count":1,"href":"https:\/\/global.tab-tv.com\/sk\/wp-json\/wp\/v2\/posts\/3004\/revisions"}],"predecessor-version":[{"id":3356,"href":"https:\/\/global.tab-tv.com\/sk\/wp-json\/wp\/v2\/posts\/3004\/revisions\/3356"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/global.tab-tv.com\/sk\/wp-json\/wp\/v2\/media\/3355"}],"wp:attachment":[{"href":"https:\/\/global.tab-tv.com\/sk\/wp-json\/wp\/v2\/media?parent=3004"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/global.tab-tv.com\/sk\/wp-json\/wp\/v2\/categories?post=3004"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/global.tab-tv.com\/sk\/wp-json\/wp\/v2\/tags?post=3004"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}<\/a>Ak\u00fd je rozdiel medzi form\u00e1tmi JPEG a JPG<\/strong><\/h2>\n\n\n\n
<\/a>\u010co je JIF<\/strong><\/h2>\n\n\n\n
<\/a>Je JPEG lep\u0161\u00ed ako PNG<\/strong><\/h2>\n\n\n\n
<\/a>Je JPEG rovnak\u00fd ako JPG<\/strong><\/h2>\n\n\n\n