I-Chroma Subsampling 4:4:4, 4:2:2 kanye no-4:2:0
Cishe uzibonile izinombolo ezingu-4:4:4, 4:2:2 kanye no-4:2:0 nokunye ukuhluka, okuphakeme kungcono akunjalo?
Ukuze uqonde ukubaluleka kwalezi zimpawu, udinga ukwazi ukuthi lezi zinombolo zisho ukuthini nokuthi ziyithinta kanjani ividiyo. Kulesi sihloko silinganisela ku-4:4:4, 4:2:2 kanye no-4:2:0 i-chroma ama-algorithms wesampula.
Kulokhu okuthunyelwe sizomboza:
Luma futhi Chroma
Isithombe sedijithali sakhiwe amaphikseli. Iphikseli ngalinye linokukhanya nombala. I-Luma imele ukucaca kanti i-Chroma imele umbala. Iphikseli ngalinye linenani layo Lokukhanya.
I-Subsampling isetshenziswa ku-Chrominance ukusebenzisa inani ledatha esithombeni kancane.
Uthatha i-Chroma yephikseli eyodwa ukuze ubale inani lamaphikseli angomakhelwane. Igridi ivamise ukusetshenziselwa lokhu eqala ezindaweni eziyisithenjwa ezi-4.
Ifomula yesilinganiso sokusampula kwe-Chroma
I-chroma subsampling iboniswa kufomula yesilinganiso elandelayo: J:a:b.
J= isamba senani lamaphikseli kububanzi bephethini yethu yebhulokhi yesithenjwa
a= inani lamasampuli e-chroma kumugqa wokuqala (phezulu).
b= inani lamasampuli e-chroma kumugqa wesibili (phansi).
Bona isithombe esingezansi ukuze uthole isampula ye-chroma engu-4:4:4
4:4:4
Kule matrix, iphikseli ngayinye inolwazi lwayo lwe-Chroma. I I-codec ayidingi ukulinganisa ukuthi inani le-Chroma kufanele libe yini ngoba irekhodwa ngephikseli ngalinye.
Lokhu kunikeza isithombe esihle kakhulu, kodwa sibekelwe amakhamera asesigabeni esiphezulu kakhulu.
Ukuqalisa ngamabhodi wakho wezindaba anyakazayo
Bhalisela incwadi yethu yezindaba futhi uthole ukulanda kwakho kwamahhala ngamabhodi wezindaba amathathu. Qalisa ngokuletha izindaba zakho ziphile!
Sizosebenzisa ikheli lakho le-imeyili kuphela ukuthola incwadi yethu yezindaba bese siyihlonipha eyakho ubumfihlo
4:2:2
Umugqa wokuqala uthola ingxenye yalolu lwazi kuphela futhi kufanele ubale okunye. Umugqa wesibili nawo uthola uhhafu futhi kufanele ubale okusele.
Ngoba ama-codec angenza izilinganiso ezinhle kakhulu, uzobona cishe akukho mehluko ngesithombe esingu-4:4:4. Isibonelo esidumile yiProRes 422.
4:2:0
Umugqa wokuqala wamaphikseli usathola uhhafu wedatha ye-Chroma, eyanele. Kodwa umugqa wesibili awunalo nhlobo ulwazi lwayo, yonke into kufanele ibalwe ngokusekelwe kumaphikseli azungezile nolwazi lokukhanya.
Uma nje kunokungafani okuncane nemigqa ebukhali esithombeni, lokhu akuyona inkinga, kodwa uma uzohlela isithombe ekukhiqizeni ngemuva, ungangena ezinkingeni.
Uma ulwazi lwe-Chroma lunyamalele esithombeni, ngeke uphinde uluthole. Ekufakweni kombala, amaphikseli kufanele "alinganise" kakhulu kangangokuthi amaphikseli adalwe ngamavelu e-Chroma angalungile, noma avimbe amaphethini anemibala efanayo engahambisani ngokoqobo.
Nge Ukhiye weChroma kuba nzima kakhulu ukugcina imiphetho iqinile, ingasaphathwa eyentuthu nezinwele, idatha ayikho ukuze ibone imibala ngendlela efanele.
Igridi engu-4:4:4 ayihlali ibalulekile, kodwa uma ufuna ukuhlela isithombe kamuva, kuyasiza ukuba nolwazi lwe-Chroma oluningi ngangokunokwenzeka.
Sebenza ngamavelu amasampula aphezulu kakhulu isikhathi eside ngangokunokwenzeka, futhi uguqulele inani eliphansi lesampula ngaphambi kokushicilelwa kokugcina, isibonelo ku-inthanethi.
Sawubona, nginguKim, umama kanye nomshisekeli we-stop-motion onesizinda ekudalweni kwemidiya nokuthuthukiswa kwewebhu. Nginothando olukhulu lokudweba nokugqwayiza, futhi manje sengingena ngekhanda emhlabeni onyakazayo. Ngebhulogi yami, ngabelana ngezifundo zami nani bafana.
