JPG Izixhobo

Guqula JPG ukuya nokubuya kwiifomathi ezahlukeneyo

Malunga JPG

Iifayili ze-JPG zisebenzisa ukucinezela okulahlekileyo okulungelelanisiweyo kwiimifanekiso, kunike ubungakanani befayili encinci ngelixa kugcinwa isisombululo esibonakalayo.

Iindlela Ezisetyenziswa Ngazo Eziqhelekileyo

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

JPG Imibuzo Ebuzwa Rhoqo Ngokuguqula

Yintoni ifayili ye-JPG?

I-JPG yifomati yomfanekiso we-raster elahlekile. Umkhokeli ususa ulwazi olubonakalayo olusengqondweni yomntu olungenakulinganiswa kubungakanani befayile obuncinci kakhulu kunobufanayo befomati ezingalahlekiyo. Ukuphinda ucinezele i-JPG uphinda ubangela ulahleko lomgangatho opheleleyo, ngoko ke hlela ukusuka kumphathi ongalahlekiyo apho kunokwenzeka khona.

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

Ewe, kwaye loo nto yinto enye ekufuneka uyazi malunga nefomati. Ukugcina ngalunye luphinda luqhube i-lossy encoder ngaphezulu komfanekiso osele ugqithisele kuyo, ngoko ke i-artefacts idityaniswa - ibonakala njenge-blocking ejikeleze umbhalo kunye ne-haloes kumazantsi anzima emva kweentsuku ezininzi zobuhlanga. Hlela ukusuka kwi master engalahlekiyo 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 i-camcorders kunye nekhadi lokufota liqhubeka livelisa JPG?

Kuba ifomati ilula ngokwaneleyo ukubhala ngexesha elibonakalayo kwizixhobo zekhompyutha ezincinci, kwaye kuba udidi lwezixhobo zokufumana imifanekiso zakhiwa ngaphaya kwayo kwaye azikho zihlaziyiwe. Isixhobo asiyenzanga umgangatho wokuziphatha, sibhala into eyaziyo ifirmware yayo. Oku kubangela ukuba ezifayile zikhulu kuba ziquka kwaye kutheni ukuguqula kuzo kukuqala into oyenzayo umntu. I-JPG yi-JPEG eqhelekileyo ukusukela ngo-1992, kwaye emva kweminyaka emithathu ihlala i-format esetyenziswa ziikhamera ezininzi kunye ne-web sites ezininzi zomfanekiso.

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 ufuna ukuba 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 ikhankanyiwe 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 uninzi. Kwanoma iyiphi into ehamba kumshicileli, gcina okuqala ngaphaya kokuba uguqula.

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, efanele ukwenziwa nantoni na ebonakala ngapha kweqokobhe. I-JPG icinezela imifanekiso ebonakalayo ngokumangalisayo kwaye ifundeka ngazo zonke izixhobo, umkhangeli zincwadi nomshicileli okhoyo.

Ndimele ndiguqule njani i-JPG ibe yifomati enye?

Guqula i-JPG ibe yi-PNG, WebP okanye TIFF xa ufuna umfanekiso ongenakucotha- ukugcina, uhlela, okanye xa umjelo omiselweyo (ushicilelo, ushicilelo lwe-banner, umfanekiso wemveliso) ufuna ukuthembeka okuphezulu.

Ingaba ukujika i-JPG kuya kunyusa ubunjani bomfanekiso?

Ukutshintsha i-JPG ibe yifomati engalahlekiyo njenge-PNG itshixa kwi-pixels yangoku ngaphandle kokufumana inzuzo engaphezulu. Ukutshintsha i-JPG ibe yifomati elahlekiyo yenza ukuba umgangatho ulahleke ngenxa yokuba umkhokeli omtsha uphinde ukhowudise i-data esele ilahlekile - gcina umthombo ukuba ucwangcisa ukuhlela ngaphezu.