JPG Amathuluzi

Guqula JPG kuya futhi kusuka kumafomethi ahlukahlukene

Mayelana JPG

Amafayela we-JPG asebenzisa ukucindezeleka okulahlekile okuhlanganisiwe ngezithombe, kubonisa ubukhulu befayela elincane ngenkathi kugcinwa isilinganiso esibonakalayo.

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 kukwaziwa khona.

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

Yebo, futhi lokho kuyinto eyodwa efanele ukwazi mayelana nefomethi. Ukugcina ngalunye kuphinde kuqhube umbhalo odlulile kusithombe esivele sidlule kulo, ngakho-ke ama-artefacts axhunywe - abonakala njenge-blocking ngaphesheya kombhalo kanye nama-haloes ezimbozweni ezinzima ngemuva kwekhulu elincane leminyaka. Hlela kusuka ku-master engalahleki futhi ukhuphule ku JPG kabili, ekugcineni, endaweni yokuvula futhi ugcine kabusha ifayela 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 ukubukhali kuhlanganisene nendawo yangaphambili - okumhlophe ngokuzenzakalela - ngesikhathi ihele libhalwe. Akukho okuzobuyiselwa emuva. Uma isithombe sidinga ukuhlala kwikhasi elimnyama noma ngaphezulu kwesithombe, guqula kufomethi egcina ukubukhali endaweni. I-JPG ayinayo ukubukeka okucacile, ikhuphuka 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 elisetshenziswe ephrinteni kunesikhashana se-monitor. Amafomethi amaningi wewebhu abhekene nawo yi-RGB kuphela, ngakho ukuguqulwa kufanele kuguqulwe, futhi ukuguqulwa kulinganiselwa — u-cyan ogcwele no-orange ushintsho kakhulu. Kunoma yini ehamba kuphrinta, gcina okuyinhloko kubhekene nanoma 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 amakhono angeke afune umuntu. lapho amanani ahlala khona, ifomu lilungile. lapho ayikho, lena yisizathu sokushintsha.

Ingabe ikhamera nendawo yedatha yemeta 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 yisisindo ngaphezu kosizo: isithombe esifanayo kwifomethi yewebhu yamanje sivame ukuba isithathu sobukhulu kukhwalithi 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 odinga ukuwufinyelela (ukuphrinta, 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.