JPG Amathuluzi

Tshintsha JPG kuya futhi kusuka kumafomethi ahlukahlukene

Mayelana JPG

Amafayela e-JPG asebenzisa ukucindezela okulahlekile okwenzelwe izithombe, okunikeza osayizi abancane bamafayela ngenkathi kugcinwa ikhwalithi yokubuka.

Ukusetshenziswa Okuvamile

Ukwabelana ngezithombe ku-inthanethi nange-imeyili
Ukubonisa izithombe kumawebhusayithi
Ukugcina izithombe zedijithali kahle

JPG Imibuzo Evame Ukubuzwa Yokuguqulwa

Yini ihele le-JPG?

I-JPG iyifomethi yesithombe se-raster elahlekile. Umqokodi ususa ulwazi olubonakalayo olubukekayo oluyingozi emehlo umuntu, eshintshanisa ubukhulu befayela elincane kakhulu kunefomethi elahlekile. Ukucindezela kabusha i-JPG kwenza ukulimala komgangatho ophelele, ngakho-ke hlela kusuka ku-master elahlekile lapho kudingeka khona.

Ingabe ukulondoloza kabusha i JPG kwenza kube nzima ngaso sonke isikhathi?

Yebo, futhi lokho kuyinto eyodwa efanele ukwazi mayelana nefomethi. Ukugcina ngayinye uphinde uqhube umbhalo odlulile kusithombe esivele sidlule kuyo, ngakho-ke ama-artefacts axhunywe - abonakala njenge-blocking ngaphesheya kombhalo kanye nama-haloes ezindongeni eziqinile ngemuva kwekhulu elincane leminyaka. Hlela kusuka ku-master engadluli futhi ukhuphule ku JPG kabili, ekugcineni, endaweni yokuvula futhi ugcine kabusha ihele elifanayo. I-JPG ilahlekelwa yisimo: isithombe siguqulwa nge-DCT, silinganiselwe, futhi sikhonjiswa nge-entropiya, nge-nobhu wobude olawula ukuthi yini elahlekile.

Kungani ama-camcorders namakhadi okuqoqa akhiqiza JPG?

Ngenxa yokuthi ifomu lilula ngokwanele ukubhalela ngesikhathi sangempela ku-hardware encane, futhi ngenxa yokuthi umndeni wezinto zokuqapha ukhishwe ngaso futhi awunakubuyekezwa. Idivayisi ayisebenzisi ukuhlolwa kokhwalithi, ibhala lokho i-firmware yayo ikwazi. Lokhu futhi kusho ukuthi kungani lezi fayela zikhulu ngento equkethwe kuzo nokuthi kungani ukushintshana kuzo kuyinto yokuqala umuntu oyenzayo. I-JPG iyisimo se-JPEG esijwayelekile kusukela ngo-1992, futhi ngemuva kweminyaka emithathu ihlala iyisimo esisetshenziswa amakhamera amaningi namanye amawebhusayithi asebenzisa ama-photos.

Kungani isizinda sami esicacile sishintsha sibe mhlophe ku JPG?

Ngenxa yokuthi JPG ayinaso isixhumi se-alpha sokugcina. I-pixel ngayinye kufanele ibe nombala oqinile, ngakho ukubukeka okucacile kuhlanganisene nendawo yangaphambili - okumhlophe ngokuzenzakalela - ngesikhathi ihele libhalwe. Akukho okuzobuyiselwa emuva. Uma isithombe sidinga ukuhlala kwikhasi elimnyama noma ngaphezulu kwesithombe, guqula kube yifomethi egcina ukubukeka okucacile endaweni. I-JPG ayinayo ukubukeka okucacile, ihamba kancane ngaso sonke isikhathi lapho igcinwa kabusha, futhi ikhiqiza ukuvala okubonakalayo kumbala ophansi nombhalo oqinile.

Ingabe JPG igcina umbala we CMYK wokuphrinta?

Kungenza, ngakho amafayela ephrinta asuka emithonjeni yomsebenzi avame ukubukeka ahlukile kusikrini: amamibala acaciswa ngezinga le-ink elisengxenyeni ye-press kune-light ye-monitor. Amafomethi amaningi we-web-facing yi-RGB kuphela, ngakho ukuguqulwa kufanele kuguqulwe, futhi ukuguqulwa kulinganiselwa — u-cyan ogcwele no-orange ushintsho kakhulu. Kunoma yini ehamba kuphrinta, gcina okususelwa kunoma yini oguqula.

Ingabe kubaluleke ukuthi JPG ingaphezu kweminyaka engu-30?

Ubudala bukhona akuyona inkinga - amafomethi amaningi onyaka akhona alungile, ngokucacile ngoba konke kudlule iminyaka eminingi ukuwafaka. Okubalulekile ukuthi unyaka uthathe isinqumo: amafayela amancane, amaprosesa aphansi, akukho nethiwekhi, futhi ayikho into edingayo. lapho athathe isinqumo khona, ifomu lilungile. lapho akwenzeki khona, yilokho okubangela ukudluliswa.

Ingabe ikhamera nendawo yedatha ye-meta igcinwa uma ngiguqula i-JPG?

Ithwala lapho ifomethi efuna ukufinyelela isekela khona - imodeli yekhamera, ukuboniswa, isikhathi sokuqoqa, kanye ne-GPS coordinates uma isisetshenziswa sizorekhoda. Le yamuva ifanele ukucabanga ngaphambi kokuthunyelwe: isithombe esihamba phambili esisuka kufoni singathwala indawo efanele ethathwe. Nciphisa i-metadata ngesikhathi sokushintshana uma isithombe sihamba endaweni esemthethweni.

Ingabe ngisebenzisa JPG ngokuqondile kwikhasi le-web?

Yebo — wonke umsakazi okhona uyenza ngokusemthethweni, ngakho-ke adinga ikhophi engekho futhi adinga ukuguquka ngesikhathi sokushicilela. Imibuzo ekhona isisindo ngaphezu kokuxhasa: isithombe esifanayo kwifomethi yewebhu yamanje sivame ukuba isithathu sobukhulu ngekhwalithi ebonakalayo efanayo, okudinga ukukwenziwa nganoma yini ebonakala phezulu kwe-fold. I-JPG icindezela izithombe ezijwayelekile ngokuhle futhi ifundeka nganoma iyiphi idivayisi, isiphequluli nephrinta ekhona.

Ngabe kufanele ngiguqule i-JPG ibe yifomethi ehlukile?

Guqula i-JPG ibe yi-PNG, WebP noma i-TIFF uma ufuna isithombe ngaphandle kokucindezeleka okuningi — ukugcinwa, ukuhlela, noma uma umsindo ofuna ukuwufinyelela (uphrinta, i-banner ad, isithombe semikhiqizo) udinga ukuthembela okuphezulu.

Ingabe ukushintsha i-JPG kuzonciphisa ukhwalithi yesithombe?

Ukushintsha i-JPG ibe yifomethi engalahlekelwanga njenge-PNG ivala ama-pixels akhona ngaphandle kokulahlekelwa okuningi. Ukushintsha i-JPG ibe yifomethi elahlekelwayo kwenza ukulimala kohlobo lwekhwalithi ngoba umbhalo-mbhalo omusha uphinde ubhale kabusha idatha elahlekelwayo - gcina umsuka uma uhlela ukuhlela ngaphezu.