Guqula JPEG kuya JFIF

Guqula Eyakho JPEG kuya JFIF amafayela kalula

Khetha amafayela akho

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

Ukulayisha

Indlela yokuguqula JPEG kuya JFIF

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

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

Isinyathelo 3: Landa i-version yakho JFIF amafayela

JPEG kuya JFIF Imibuzo Evame Ukubuzwa Yokuguqulwa

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

Layisha phezulu ihele lakho JPEG futhi umguquli wethu ufaka ukulungisa umgangatho okwaziyo ifomethi ye-JFIF. 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. I-bitstream ifana ne-.jpg: DCT-based lossy compression, ngokuvamile nge-4:2:0 chroma subsampling, ifakwe ku-JFIF noma Exif header. Isithombe-data yi-JPEG ejwayelekile; i-JFIF ichaza kuphela ukuphakama nokuncane kwezindawo ezingaphansi kwayo, ngakho-ke i-.jfif ne-.jpg yisithombe esifanayo.

Ingabe umbala wami we-CMYK uzoqhubeka nokuguqulwa ku JFIF?

Kuguqulwa ku sRGB, ngoba JFIF ayikho indlela ye CMYK. Ukusetshenziswa kweskrini lokho kulungile. Uphrinta okuhweba akuyona - i-gamut shift ishintsha indlela imibala egcwele ikhiqizwa ngayo kuphrinta, ngakho-ke thumela umphrinta okuqala JPEG endaweni ye-JFIF. I-.jfif ubanzi luthinta amawindi namathuluzi wewebhu ambalwa ukuvimbela ifayela, okuvame ukuba yisizathu sodwa sokuba umuntu aguqule.

Ingabe i-JFIF igcina i-EXIF data kusuka ku-JPEG 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. 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 ukuguqulwa JPEG kuya ku JFIF kugcina ukubukeka okucacile?

Ukubukeka okucacile kuhlala lapho JFIF 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-JFIF. JFIF yi-JPEG File Interchange Format — isibonisi esiphezulu esichazayo esikwenza i-JPEG bitstream engaqondakali ibe yifayela eliphathekayo.

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

Amaprofayili wemibala we-ICC afakwe ngaphakathi afundwa kusuka kumthombo JPEG futhi axhunywe kabusha ku-JFIF 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 JPEG usuka ku-JFIF?

Ikhamera EXIF (ISO, ishutter, ilensi, GPS) igcinwa ngokuzenzakalela ngesikhathi JPEG -> JFIF 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 JPEG amafayela ku JFIF ngasikhathi sinye?

Yebo — cindezela amafayela amaningi JPEG 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 JPEG kuya ku JFIF 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 JFIF?

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

Ingabe ihele JFIF lincane uma kungabonakali izinto ezibonakalayo?

Nge-JPG / WebP, umgangatho 75-85 uvame ukuletha i-JFIF 60-80% encane kune-JPEG ngaphandle koshintsho olubonakalayo emgwaqweni wokubuka ojwayelekile. Nge-lossless JFIF (PNG, TIFF), cabanga ukulondoloza okuncane — ngokuvamile 5-30% nge-deflate / LZW yokucindezela okungcono kune-source esenayo. I-JFIF ihambisana ne-JPG, ngakho ukubizwa kabusha noma ukushintshana kuyinqubo ye-metadata ngaphezu kokuphindeka kokufaka ikhowudi.

Ingabe amafayela ami JPEG afihlakele ngesikhathi sokuguqulwa?

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

Ingabe i-JPEG kuya ku-JFIF 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.