Guqula EPUB kuya PDF

A EPUB ilungele ukumiswa komgwaqo kuyo yonke ububanzi nesimo sefonti umfundi esebenzisayo; i PDF ilungisa ikhasi lobubanzi ngesikhathi sokushintshana, ngakho-ke kufoni uthola ikhasi lonke elincane kunesihloko esiphinde sahlukaniswa isikrinini. Lokhu kuyindlela efanele yokuhweba lapho isakhiwo singahambanga, futhi okubi lapho ihele lifundeka kudivayisi encane. I-EPUB iphinde ivule umbhalo kunoma yisiphi isikrini sobukhulu kanye nanoma yisiphi isifomathi sobukhulu, okuzokwenza kube lula ukuyifunda kufoni kanye nomfundi we-e. PDF yi Adobe's Portable Document Format kusukela ngo-1993, ejwayelekile njenge ISO 32000 futhi manje yidokhumende eliphelele eliqinile-lohlelo.

Yebo lapho amafomethi amabili angaveza khona. Umbukiso, iziqephu ezihlukanisiwe nethebula eli navigable lezinto eziqukethwe yimetadata eyenziwe, ngakho zihamba phambili ngaphezu kokuhlanganiswa kobhalo. Izinhlamvu zesizinda kanye nezingcezu zesibalo ziyingxenye ezibucayi — zikhuphuka zibe umbhalo ongaphakathi kwelayini ezinjongoni ngaphandle kwendlela yokufaka i-ankere.

Yebo, futhi i-EPUB ayikwazi. Amasiphequluli athumela umbhalo oguqulwe nge-PDF futhi akukho ku-EPUB, ngakho-ke i-EPUB ixhumana nokukhuphula uma i-PDF ibonisa umbhalo ongezansi. Lokhu kuvame ukube yisimo esibalulekile lapho ihele lihamba kwikhasi le-web ngaphezu kokungenisa isicelo. I-PDF ibukeka ifana nge-byte-by-byte kunoma iyiphi imishini nanoma iyiphi iphrinta, ngakho-ke amakontraka, amafayela nama-papers amakhono wonke ahlala kuyo.

DRM, cishe nganoma yisiphi isinqumo. I-EPUB ekhuselwe ibhalwe ngokufihlakele futhi ixhunywe ku-akhawunti, futhi akukho mguquli ongayifihla — sihlanganisa. Amafayela awenza wena, noma athengiswe esitolo esingena-DRM, uguqula ngaphandle kwezinkinga. I-EPUB ayinayo ikhasi eliqinile, ngakho-ke inani lekhasi alikho lutho, futhi ukwakheka okunzima — amathebulethi, izilinganiso, uhlu oluningi — kunzima kakhulu.

Kuxhomekeka ngokuphelele ukuthi umbhalo ongokoqobo ukhona noma cha. I-PDF eyenziwe kusuka kudokhumende ifaka umbhalo ongokoqobo futhi itholakale; i-PDF eyenziwe kusuka ku-scans noma izithombe yisithombe sombhalo futhi ayinjalo, kuze kube i-OCR ifaka umbhalo. /pdf-ocr/ yenza lokho, futhi kufanelekile ukuqhuba ngaphambi kokuguqulwa okulindeleke ukufundwa kwegama.

Yebo — izinketho ezithuthukisiwe zibonisa ubukhulu bekhasi (A4, A5, iposi, 6×9 ukuhweba iphepha-mthunzi, okujwayelekile), umkhawulo osetshenzisiwe (ophansi / ojwayelekile / obanzi), kanye nobukhulu befonti. A5 + 11pt yiphutha elijwayelekile le-e-reader-like; 6×9 + 11pt lifana neminye imibhalo ephrintiwe.

Yebo — amafonti e EPUB OPF afundeka futhi afakwe njengezinhlamvu zefonti ze-PDF ezingaphansi kwe PDF, ngakho-ke imiphumela ibonisa ngokufanayo kuwo wonke umbukeli we-PDF. Uma i-EPUB isebenzisa amafonti ngaphandle kokungenisa izinhlamvu, sizoshintsha ilayisense-ecacile yokubuyela emuva (DejaVu Serif / Sans).

Yebo — i NCX / nav kusuka ku EPUB iguqulwa ibe yi PDF amabhukwana (indawo yokuphawula engxenyeni ye-Acrobat / Preview) NAMAZITHOMBE axhunywe ngokuchofoza ku PDF ikhasi le-TOC elitholwe. Zonke zixhunywe ku-PDF ikhasi elifanele le-ankile.

Izithombe ku EPUB zifakwe kusinqumo sabo sasekhaya. Ububanzi buvunyelwe ku PDF ifremu yombhalo; izithombe ezikhulu kunakholamu zilinganiselwa phansi ukuze zilungele. "Isithombe sekhwalithi" isinketho esiphakeme silawula ukuphinda-ukukhonjiswa kwekhwalithi (95 = ihele, 75 = esincane).

Ukuphrinta kwebhizinisi, shintsha izinketho eziphezulu zibe 300 DPI / CMYK / akukho-ukulimala. Iphutha PDF ikhishwa iscreen-optimized (RGB, 150 DPI), elungile ukuphrinta ngokuzimela ku-laser yasendlini kodwa ekhanyayo ku-offset / digital print runs.

Isiqephu-kuqala "uhlala-kwekhasi-lokudla" CSS ku EPUB ifaka amakhasi amnyama e-verso, njengencwadi ephrintiwe. Misa "ukwenza isiqephu siqale kukhasi elilodwa" okukhethwa kukho okuphezulu ukuwasusa; ushintsha uhlelo olufana nencwadi ngekhasi elincinane PDF.