Guqula JFIF kuya JPEG

Guqula Eyakho JFIF kuya JPEG amafayela kalula

Khetha amafayela akho

*Amafayela asusiwe ngemva kwamahora angu-24

Guqula amafayela afinyelela ku-1 GB mahhala, abasebenzisi be-Pro bangaguqula amafayela afinyelela ku-100 GB; Bhalisa manje

Ukulayisha

Indlela yokuguqula JFIF kuya JPEG

Isinyathelo 1: Layisha eyakho JFIF amafayela usebenzisa inkinobho engenhla noma ngokuhudula bese uphonsa.

Isinyathelo 2: Chofoza inkinobho ethi 'Guqula' ukuze uqale ukuguqulwa.

Isinyathelo 3: Landa i-version yakho JPEG amafayela

JFIF kuya JPEG Imibuzo Evame Ukubuzwa Yokuguqulwa

Ngiguqula kanjani i-JFIF ibe yi-JPEG ngaphandle kokulahlekelwa ubuhle besithombe?

Layisha phezulu ihele lakho JFIF futhi umguquli wethu ufaka ukulungisa umgangatho okwaziyo ifomethi ye-JPEG. Kuzo zonke izimo ezingenalutho (PNG, TIFF, BMP) wonke ama-pixel agcinwa nge-bit-by-bit; kuzo zonke izimo ezingenalutho (JPG, WebP) ungalungisa i-quality factor (iphutha 90) ngaphambi kokufaka ngezansi. Isithombe-data yi-JPEG ejwayelekile; i-JFIF ichaza kuphela ukuphakama nokuncane kwezindawo ezingaphansi kwayo, ngakho-ke i-.jfif ne-.jpg yisithombe esifanayo. I-bitstream ifana ne-.jpg: DCT-based lossy compression, ngokuvamile nge-4:2:0 chroma subsampling, ifakwe ku-JFIF noma Exif header.

Ingabe i-JPEG igcina i-EXIF data kusuka ku-JFIF yami?

Ngokungajwayelekile yebo, lapho injongo ikhona khona ukuze ibekwe khona - imodeli yekhamera, izilungiselelo zokuveza, ilensi kanye ne-GPS coordinates zonke zihamba phambili. I-GPS iyindawo efanele ukucabanga ngayo: uma isithombe sizoshicilelwa, sebenzisa i-strip-metadata option ukuze ungasakazi lapho isithombe sithathwe khona. JFIF yi-JPEG File Interchange Format — isibonisi esiphezulu esichazayo esikwenza i-JPEG bitstream engaqondakali ibe yifayela eliphathekayo.

Ingabe ukuguqulwa JFIF kuya ku JPEG kugcina ukubukeka okucacile?

Ukubukeka okucacile kuhlala lapho JPEG i-PNG, WebP, TIFF, GIF, noma i-SVG. Ukushintsha ibe yi-JPG kuzoba ne-alpha channel efana nendawo yangasemva ebomvu — uma ufuna ukubukeka okucacile, khetha okuzokwazi ukubukeka okucacile endaweni ye-JPEG. I-JPEG iyisimo esifanayo ne-JPG — isibonisi esibhalwe ngezansi esiyisithupha siyisisekelo, futhi isibonisi esibhalwe ngezansi esiyisithathu sikhona kuphela ngenxa ye-DOS 8.3 isinqumo segama lefayela.

Ingabe iprofayili yami yombala (sRGB / Adobe RGB / CMYK) izohlala i JFIF kuya ku JPEG?

Amaprofayili wemibala we-ICC afakwe ngaphakathi afundwa kusuka kumthombo JFIF futhi axhunywe kabusha ku-JPEG lapho ifomethi ixhasa khona (JPG, PNG, TIFF, WebP). Amafomethi enza i-profayili ayixhasi ibuyela emuva ku-sRGB nge-soft-proof step.

Yini ekwenzeke ku-EXIF metadata uma uguqula JFIF usuka ku-JPEG?

Ikhamera EXIF (ISO, ishutter, ilensi, GPS) igcinwa ngokuzenzakalela ngesikhathi JFIF -> JPEG lapho amafomethi amabili exhasa i-metadata. Sebenzisa ukushintsha ubumfihlo ukususa i-metadata ngaphambi kokulayisha ngezansi uma ufuna ukuhlanganisa izithombe ngaphandle kokutholakala kwendawo noma idivayisi-fingerprint.

Ingabe ngingenza ukuguqulwa kwekhulu le JFIF amafayela ku JPEG ngasikhathi sinye?

Yebo — cindezela amafayela amaningi JFIF endaweni yokulayisha futhi babeke ifile ngokufanayo. Isigaba esimahhala sithatha ama-100 MB ngefayela ngalinye; iPremium ayinaso isiphetho sefayela ngalinye futhi isebenza ngemisebenzi eminingi efana, ngakho-ke isithombe esingu-200 siqedela ngezansi kwemizuzu emibini.

Ingabe JFIF kuya ku JPEG iqhathaniswa kanjani ne-Photoshop / GIMP ngemisebenzi efanayo?

Ukuguqulwa kwefomethi elula sisebenzisa i-libpng / libjpeg-turbo / libwebp / ImageMagick pipes efana ne-desktop editor esebenzisa, ngekhwalithi efanayo. Ushintsho ukuthi amathuluzi wedesktop avula ifayela elinye ngasikhathi sinye; sivumela iqembu futhi sisebenzisana nabo kubasebenzi bekhasimende.

Yini isixazululo kanye nezici zehele JPEG?

Ukuziphatha okuzenzakalelayo yi-1:1 — i-JPEG yakho yesokudla inezici ze-pixel ezifanayo ne-JFIF. Uma ufuna ukushintsha ubukhulu njengengxenye yokuguqulwa, sebenzisa /resize-image/ ngemuva, noma ubeke izinhlelo nge- /image-pipeline/ utility.

Ingabe ihele JPEG lincane uma kungabonakali izinto ezibonakalayo?

Nge-JPG / WebP, umgangatho 75-85 uvame ukuletha i-JPEG 60-80% encane kune-JFIF ngaphandle koshintsho olubonakalayo emgwaqweni wokubuka ojwayelekile. Nge-lossless JPEG (PNG, TIFF), cabanga ukulondoloza okuncane — ngokuvamile 5-30% nge-deflate / LZW yokucindezela okungcono kune-source esenayo. I-JPEG iyisibonisi esibanzi esithandwa kakhulu yikhamera, isibhamu kanye nesofthiwe esuka ku-Unix, futhi itholakala emhlabeni wonke.

Ingabe amafayela ami JFIF afihlakele ngesikhathi sokuguqulwa?

Yebo — amafayela alayishwe phezulu JFIF aqhubekelwa phambili emisebenzini ehlukanisiwe futhi acishwe ngaphakathi kwemizuzu. Asikwazi ukufunda, ukugcina, noma ukuhlanganisa idatha ye-pixel. Ifasitela eligcwele lokugcinwa libhalwe ku /privacy/.

Ingabe i-JFIF kuya ku-JPEG isebenza ngezithombe ezinkulu kakhulu (50MP+)?

Yebo, mahhala kuze kube yi-100 MB. I-Premium iphatha izingeniso ezinkulu kakhulu (300 MB+) kanye ne-exotic per-pixel depths (16-bit PNG, 32-bit float TIFF, HEIF 10-bit). Ipayipi lisakaza imikhawulo ye-pixel ngakho-ke inkumbulo isebenzisa izilinganiso ngenani lemikhawulo, hhayi inani le-pixel jikelele.

Kungani ihele lami eliguqulwe JPEG likhulu noma lincane kunalokho okulindelekile?

Ihele JFIF elinamandla okucindezeleka (JPG enamandla okulahlekelwa) livame ukukhula uma liphinde likhodwe ku JPEG (PNG, TIFF) elingalahlekelwa, futhi i-bitrate ephezulu engenalutho JFIF livame ukuncipha kakhulu uma liya ku-JPG/WebP. Ukulingana kuxhomekeka kusithombe esiqukethwe (izithombe zicindezelwa ngendlela eyahlukileyo kunaleyo ye-line-art noma izithombe zeskrini). I-.jfif ubanzi luthinta amawindi namathuluzi wewebhu ambalwa ukuvimbela ifayela, okuvame ukuba yisizathu sodwa sokuba umuntu aguqule. I-JPEG ihlanganisa wonke ama-JPG alinganiselwe — akukho i-alpha, ukulahleka kosuku lokuzalwa ku-re-save — nge-noise engeziwe yesoftware ephatha izixhumanisi ezimbili ngokuhlukile.