JPG Izixhobo

Guqula JPG ukuya nokusuka kwiifomati ezahlukeneyo

Malunga JPG

Iifayile zeJPG zisebenzisa i-lossy compression eyenzelwe iifoto, zibonelela ngobukhulu obuncinci beefayile ngelixa zigcina umgangatho obonakalayo.

Iindlela Ezisetyenziswa Ngazo Eziqhelekileyo

Ukwabelana ngeefoto kwi-intanethi nange-imeyile
Ukubonisa imifanekiso kwiwebhusayithi
Ukugcina iifoto zedijithali ngokufanelekileyo

JPG Imibuzo Ebuzwa Rhoqo Ngokuguqula

Yintoni ifayili JPG?

I-JPG (JPEG) yifomathi yomfanekiso esebenzisa ucinezelo olulahlekileyo, olulungele iifoto kunye nemifanekiso enzima.

Ingaba i-JPG ifana ne-JPEG?

Into efanayo ngokuchanekileyo: enye eqhelekileyo, enye bitstream, ii spellings ezimbini. Incwadi ezintathu ezibanzi ikhona kuba i DOS edlulileyo igama lefayile livumela kuphela iimpawu ezintathu, nencwadi ezine ezibanzi enye yiyo ebhaliweyo. Ukunika igama kwakhona ifayile ukusuka kwinye ukuya kwenye ayiguquli nantoni na kwaye ayikhuphi nantoni na, kwaye yonke ikhamera, umkhangeli zincwadi nomhleli ufunda zombini. Into ekuphela kwayo ehlala ihlukile yisoftware efuna kakhulu ukugqiba ifayile nge fayile yesiqhelo. I-JPG yi-JPEG eqhelekileyo ukusukela ngo-1992, kwaye emva kweminyaka emithathu ihlala i-format esetyenziswa ziikhamera ezininzi kunye ne-web sites ezininzi zomfanekiso.

Ingaba ukubuyisela uvimba we-JPG kwenza ukuba kube nzima ixesha ngalinye?

Ewe, kwaye loo nto yinto enye ekufuneka uyazi malunga nefomati. Ukugcina ngalunye uphinda uqhube ikhowudi elahlekile ngaphezulu komfanekiso osele ugqithisele kuyo, ngoko ke iindidi zezinto eziluncedo zidityanisiwe - zibonakala njengezithintelo ezijikeleze umbhalo kunye ne-haloes kumazantsi anzima emva kweentsuku ezininzi zophuhliso. Hlela ukusuka kumphathi ongalunganga kwaye urhwebe ngaphandle kwi JPG kabini, kwisiphelo, kunokuba uvule kwakhona ugcine kwakhona ifayile efanayo. I-JPG ilahlekile: umfanekiso uguqulwa nge-DCT, i-quantized, kunye ne-entropiya-ekhowudiweyo, ngeqhosha lomgangatho elilawula ukuba kuphi okuninzi okulahlekileyo.

Kutheni le nto ikhamera nefowuni nganye inika JPG?

Kuba yifomati yonke inkqubo yomfanekiso ibekwe kwiminyaka emininzi eyadlulayo, kwaye akukho nto ukusukela ngoko ifanele umngcipheko wokulungelelanisa umenzi wekhamera. I data yophatho iqhubekekiswa kwaye ikhowudiwe kwikhamera ngokwayo, kwiqwalaselo lomgangatho olutywinwe kwimenu, kwaye oko kuwela kwikhadi sele kumfanekiso ogqityiweyo. Le yisizathu sokuba uguqulelo lokuqala lomfanekiso aluzange lube lugqibo olulahlekileyo abantu bakhathazeka ngalo - utshintsho olulahlekileyo lwaluye

Yintoni isicwangciso somgangatho endingayisebenzisa xa ndiguqula kwi JPG?

Indawo ephakathi kwe 80 ne 90 yento nantoni na umntu oza kuyijonga. Ezantsi malunga ne 75 iindidi zezinto ezibonakalayo ziyaqala ukubonisa kwisikhumba, ilanga nakweyiphi na indawo enkulu ethe tyaba; ngaphezulu kwe 95 ifayile ikhula ngokukhawuleza ngelixa akukho mntu ubona utshintsho. Isicwangciso asiyophawu lomfanekiso, lugqibo malunga norhwebo lwangaphandle oluthile - ngoko khetha apho ifayile isiya khona, kwaye ugcine okuqala kwixesha elizayo xa ufuna impendulo eyahlukileyo.

Kutheni le nto isiqalo sam esicacileyo sitshintshe simhlophe kwi JPG?

Kuba JPG ayinasiqhagamshelanisi se-alpha sokugcina kuyo. I-pixel nganye kufuneka ibe nombala oqinileyo, ngoko ukubonakala okucacileyo kudityaniswa nokungasemva - omnyama ngokumiselweyo - kwixesha apho ifayili ibhalwa khona. Akukho nto ibuyiselwa emva koko. Ukuba umfanekiso kufuneka uhlale kwiphepha elimnyama okanye ngaphezulu komfanekiso, guqula kwifomati egcina ukubonakala okucacileyo endaweni yoko. I-JPG ayinakubonakaliswa ngokucacileyo, ikhupha ngaphezulu xa igcinwa kwakhona, kwaye ivelisa ukutshixa okubonakalayo kumbala othambileyo nombhalo oqaqambileyo.

Ingaba i JPG igcina umbala we-CMYK woshicilelo?

Iyakwazi, nto leyo eyenza iifayile ezivela kwindlela yomsebenzi yoshicilelo ngamanye amaxesha zijongeka zinomdla kwikhusi: imibala ikhankanyiweyo kwipesenti ye inki yokushicilela kunokuba kukukhanya kwemboniselo. Iifomati ezininzi ze web- ejongeyo yi RGB kuphela, ngoko uguqulelo kufuneka luguqule, kwaye uguqulelo luyi- 100% cyan ne- orange shift. Nantoni na ehamba kumshicileli, gcina okubhaliweyo kunye nobubhali obufutshane nokuba uguqula ntoni.

Ingaba kubaluleke na ukuba u JPG uneminyaka engaphezu kweeminyaka ezimashumi amathathu ubudala?

Ubudala ngokwalo alukuyingxaki - iifomati ezininzi ezivela kulo nyaka zihlala zilungile, ngokucacileyo ngenxa yokuba konke kwakuba neminyaka emininzi yokuzisebenzisa. Okubalulekileyo kulapho ixesha licinga khona: iifayile ezincinci, abaqhubi abancinci, akukho msebenzi womnatha, kunye neempawu ezingafunekiyo. Apho ezi zinto zicinga khona, ifomati ilungile. Apho azisebenzi, le yisizathu sokuguqula.

Ingaba ikhamera nendawo ye-metadata igcinwa xa ndiguqula i-JPG?

Ithwala apho ifomati emiselweyo ixhasa khona - imodeli yekhamera, ukubonakala, ixesha lokuqwalasela, kunye ne GPS ikhowudi xa isixhobo sirekhoda. Lo mhla wokugqibela ufanele uthathelwe ingqalelo phambi koshicilelo: umfanekiso osuka kwifowuni uthatha indawo efanelekileyo. Ukhuphe i metadata ngexesha loguqulelo xa umfanekiso usiya kwindawo esemthethweni.

Ndingasebenzisa i-JPG ngokuthe ngqo kwiphepha le-web?

Ewe - yonke ibrowser yangoku iyenza ngokusemthethweni, ngoko ayifunanga ukopi ozakubuyela umva nokuguqulela ngexesha lokushicilela. Umbuzo osele ukhona ubunzima kunokuba uxhaso: umfanekiso ofanayo kwifomati ye web ekutsha ihlala ikwishumi elinesibini yobungakanani kwifomati ebonakalayo yomgangatho, ekufuneka yenziwe nantoni na ebonakala ngapha kweqokobhe. I-JPG icinezela imifanekiso ebonakalayo ngokumangalisayo kwaye ifundeka ngazo zonke izixhobo, umkhangeli zincwadi nomshicileli okhoyo.

Ndingayinika kwakhona igama elipheleleyo lesiqendu endaweni yokuguqula i JPG?

Akukho nanye, kwaye ifanele ukuqonda kutheni: unikezelo luphawu, ngelixa i bytes ngaphakathi zidityaniswe kwifomati ekhethekileyo. Ukuphinda ubize ifayile ivelisa ifayile igama layo lithembisa into imixholo yayo ayinikezeli, kwaye nantoni na evula ifayile okanye ilahlekile ifayile okanye ifunda ngokungachanekanga. Ukuphela kwendlela efutshane kuhlobo olubini oluyinyani ibhokisi efanayo phantsi kwegama elahlukileyo - kwaye nalapho ukuphinda ubhale ngokuchanekileyo kukhuselekile kunegama elahlukileyo.

Ndingaguqula isiqulathi seefayili esipheleleyo se JPG iifayili ngenye indlela?

Nge akhawunti, ewe - shiya ngaphaya kunye kwaye zifolwa njengemisebenzi enye endaweni yokuphathwa enye ngexesha, ngemimiselo efanayo esetyenziswa kwiqela kunye neziphumo ezibuyiselweyo kunye. Uguqulelo oluzenzekelayo luqhuba ifayile enye ngexesha (izixhobo zokudibanisa zithatha ezimbini); inkqubo ehlawulweyo ivula uqhubekeko lweqela kunye nobukhulu befayile nganye umda, owenza uguqulelo lwefayile yonke yovimba isebenziseke.