I-JPEG ifomethi elahlekile enikeza izinga lokuminyanisa eliphakeme kune-PNG ekuhwebeni kwekhwalithi.
Ingabe i-JPEG ilahlekile noma icindezeleke ngokungalahleki ingaminyanisa kangakanani?
Ukucindezelwa kwe-JPEG
Kuwuhlobo lokucindezela olulahlekile lwezithombe zedijithali. Ukuminyanisa isithombe esilahlekile kunciphisa usayizi wefayela futhi kuqede ulwazi olungafuneki. Umsebenzisi unquma ukuthi kungakanani ukulahlekelwa azokwethula ngokuhwebelana ngosayizi wesitoreji nekhwalithi. Isibonelo, ikhwalithi yokucindezelwa isukela ku-1 kuye ku-100.
Ingabe i-JPEG iyisibonelo sokucindezelwa okulahlekile?
Izindlela ezilahlekile zinganikeza amazinga aphezulu okucindezela futhi ziphumele kumafayela amancane acindezelwe, kodwa inombolo ethile yamaphikseli asekuqaleni, amaza omsindo noma amafreyimu evidiyo asuswa unomphela. Izibonelo yizithombe ezisetshenziswa kakhulu ze-JPEG, ividiyo ye-MPEG kanye nefomethi ye-MP3 yomsindo. Ukucindezela okukhulu, ifayela lincane.
Ingabe ukucindezelwa kwe-JPEG kuyabuyiseleka emuva?
Phakathi kwamafomethi ezithombe zedijithali ahlukahlukene asetshenziswa ekuphileni kwansuku zonke, i-Joint Photographic Experts Group (JPEG) idume kakhulu. Ngakho-ke, ukufihla idatha ebuyiseleka emuva (i-RDH) ezithombeni ze-JPEG kubalulekile futhi kuwusizo ezinhlelweni eziningi ezifana nokuphathwa kwengobo yomlando kanye nokuqinisekiswa kwesithombe.
Ingabe i-JPEG inokucindezelwa?
Ngenkathi konke. Amafayela e-JPG ngempela ayi-JPEG ecindezelwe, Ukucindezelwa kwe-JPEG kungasetshenziswa kwamanye amafomethi amaningi wefayela, okuhlanganisa i-EPS, PDF, kanye namafayela e-TIFF. … Ukucindezela kwe-JPEG kuzama ukwenza amaphethini kumanani ombala ukuze kwehliswe inani ledatha okudingeka iqoshwe, ngaleyo ndlela kwehliswe usayizi wefayela.
Ingabe ukuminyanisa okulahlekile kwesithombe?
Ukucindezela okulahlekile kubhekisela ekuminyanisweni lapho enye idatha evela efayelini lokuqala (JPEG) ilahleka. Inqubo ayibuyiseleki emuva, uma usuguqulele ekulahlekeni, awukwazi ukubuyela emuva. Futhi lapho uyicindezela kakhulu, yilapho ukonakala kakhulu kwenzeka. Ama-JPEG nama-GIF womabili amafomethi ezithombe ezilahlekile.
Ukuminyanisa okungalahleki kunciphisa kanjani usayizi wefayela?
Ukuminyanisa okungalahleki kusho ukuthi wehlisa usayizi wesithombe ngaphandle kokulahlekelwa yikhwalithi. Ngokuvamile lokhu kufinyelelwa ngokukhipha idatha yemetha engadingekile kumafayela e-JPEG nawe-PNG. … Inzuzo enkulu yokuminyanisa okungalahleki ukuthi ikuvumela ukuthi ugcine ikhwalithi yezithombe zakho kuyilapho wehlisa usayizi wefayela lazo.
Ingabe i-JPEG iyifomethi elahlekile?
I-JPEG ivamise ukusetshenziselwa izithombe zekhamera yedijithali ngoba inosayizi wefayela omncane ngokwekhwalithi ebonisayo. I-JPEG ifomethi elahlekile enikeza izinga lokuminyanisa eliphakeme kune-PNG ekuhwebeni kwekhwalithi.
Kungani kusetshenziswa ukucindezela okungalahleki?
Ukuminyanisa okungenakulahlekelwa kusetshenziswa ezimeni lapho kubalulekile ukuthi idatha yoqobo kanye neyokucindezelwa ifane, noma lapho ukuchezuka kudatha yoqobo kungeke kube kuhle. Izibonelo ezijwayelekile izinhlelo ezisebenzisekayo, imibhalo yombhalo, nekhodi yomthombo.
Iyiphi indlela edumile yokucindezelwa okulahlekile kwezithombe?
Ukucindezelwa okulahlekile
Lokhu kungaholela ekulahlekeni okuncane kwekhwalithi yesithombe noma ifayela lomsindo. Indlela edumile yokucindezela ukulahlekelwa kwezithombe i-JPEG, yingakho izithombe eziningi eziku-inthanethi ziyizithombe ze-JPEG.
Yibuphi ububi be-JPG?
2.2. Okubi kwefomethi ye-JPEG
- Ukucindezelwa okulahlekile. I-algorithm yokucindezela isithombe "elahlekile" isho ukuthi uzolahlekelwa idatha ethile ezithombeni zakho. …
- I-JPEG ingu-8-bit. …
- Izinketho zokuthola okulinganiselwe. …
- Izilungiselelo zekhamera zinomthelela ezithombeni ze-JPEG.
25.04.2020
Uyehlisa kanjani isithunzi se-JPEG?
Ama-JPEG Alahlekelwa Ikhwalithi Njalo Lapho Evulwa: Amanga
Ukulondoloza isithombe ngokuphindaphindiwe ngesikhathi esifanayo sokuhlela ngaphandle kokuvala isithombe ngeke kuqongelele ukulahlekelwa ngekhwalithi. Ukukopisha nokuqamba kabusha i-JPEG ngeke kwethule noma yikuphi ukulahlekelwa, kodwa abanye abahleli bezithombe bawacindezela kabusha ama-JPEG lapho kusetshenziswa umyalo othi “Londoloza njenge”.
Hlobo luni lokuminyanisa olusetshenziswa izithombe ze-JPEG?
I-JPEG isebenzisa indlela yokulahlekelwa yokucindezelwa okusekelwe ku-discrete cosine transform (DCT). Lokhu kusebenza kwezibalo kuguqula uhlaka/inkambu ngayinye yomthombo wevidiyo isuke esizindeni se-spatial (2D) ibe isizinda samafrikhwensi (isizinda esishintshayo esibizwa nangokuthi isizinda).
Yikuphi ukucindezela kwe-JPEG okungcono kakhulu?
Njengebhentshimakhi evamile:
- Ikhwalithi ye-JPEG engu-90% inikeza isithombe sekhwalithi ephezulu kakhulu kuyilapho ithola ukuncishiswa okuphawulekayo kusayizi wefayela wokuqala ongu-100%.
- Ikhwalithi ye-JPEG engu-80% inika ukuncishiswa okukhulu kosayizi wefayela cishe nokulahlekelwa yikhwalithi.
Ingabe i-JPEG ihlale iyi-RGB?
Amafayela e-JPEG avamise ukubhalwa ngekhodi esuka kumthombo wesithombe se-RGB aye ku-YCbCr emaphakathi ngaphambi kokuthi acindezelwe, bese kuthi lapho ekhishwa ikhodi abuyiselwe ku-RGB. I-YCbCr ivumela ingxenye yokukhanya yesithombe ukuthi iminyaniswe ngenani elihlukile kunezingxenye zombala, okuvumela isilinganiso esingcono sokucindezela.
Ngilishintsha kanjani izinga lokucindezela le-JPEG?
Izinyathelo Ezi-3 Zendlela Yokushintsha Amazinga Wokucindezelwa Weskena sakho se-JPEG
- Isinyathelo sokuqala: Shisa Iskena Sakho Futhi Uthole "Izinketho Zokugcina Ifayela"
- Isinyathelo sesi-2: Vula Izinketho Zokulondoloza Ifayela Futhi Thola "Izinketho ze-JPEG"
- Isinyathelo sesi-3: Shintsha Amazinga Ukuze Ucindezeleke KAKHULU KAKHULU / Ikhwalithi Ephakeme Kakhulu.