Zitsanzo za Chroma 4:4:4, 4:2:2 ndi 4:2:0
Mwinamwake mwawonapo manambala a 4:4:4, 4:2:2 ndi 4:2:0 ndi zosiyana zina, apamwamba ndi abwinoko?
Kuti mumvetse kufunikira kwa mayinawa, muyenera kudziwa zomwe ziwerengerozi zikutanthawuza komanso momwe zimakhudzira kanema. M’nkhaniyi tingoyerekeza 4:4:4, 4:2:2 ndi 4:2:0. chroma kusanja ma algorithms.
Mu positi iyi tikambirana:
Luma ndi Chroma
Chithunzi cha digito chimapangidwa ndi pixelisi. Pixel iliyonse imakhala ndi kuwala ndi mtundu. Luma imayimira kumveka ndipo Chroma imayimira mtundu. Pixel iliyonse ili ndi mtengo wake wa Luminance.
Subsampling imagwiritsidwa ntchito mu Chrominance kuti agwiritse ntchito kuchuluka kwa data pachithunzichi mochepera.
Mumatenga Chroma ya pixel imodzi kuti muwerengere mtengo wa ma pixel oyandikana nawo. Gridi nthawi zambiri imagwiritsidwa ntchito poyambira pa 4.
Ratio formula ya Chroma subsampling
Kuwerengera kwa chroma kukuwonetsedwa munjira zotsatirazi: J:a:b.
J= chiwerengero chonse cha mapikseli mu m'lifupi mwa chigawo chathu cholozera
a= chiwerengero cha zitsanzo za chroma pamzere woyamba (wapamwamba).
b= chiwerengero cha zitsanzo za chroma mumzere wachiwiri (pansi).
Onani chithunzi chomwe chili pansipa cha 4:4:4 chroma subsampling
4:4:4
M'matrix awa, pixel iliyonse ili ndi chidziwitso chake cha Chroma. The Codec sichiyenera kuyerekeza kuti mtengo wa Chroma uyenera kukhala wotani chifukwa umalembedwa mu pixel iliyonse.
Izi zimapereka chithunzi chabwino kwambiri, koma zimasungidwa makamera omwe ali mugawo lapamwamba kwambiri.
Kuyamba ndi zolemba zanu zoyimitsa nkhani
Lembetsani ku kalata yathu yamakalata ndikutsitsa kwaulere ndi zolemba zitatu. Yambani ndikupangitsa nkhani zanu kukhala zamoyo!
Tidzangogwiritsa ntchito imelo yanu kutsamba lathu ndikulemekeza lanu zachinsinsi
4:2:2
Mzere woyamba umangotenga theka la chidziwitsochi ndipo uyenera kuwerengera zina zonse. Mzere wachiwiri umapezanso theka ndipo uyenera kuwerengera ena onse.
Chifukwa ma codec amatha kuwerengera bwino kwambiri, simudzawona kusiyana kulikonse ndi chithunzi cha 4:4:4. Chitsanzo chodziwika ndi ProRes 422.
4:2:0
Mzere woyamba wa ma pixel umapezabe theka la data ya Chroma, yomwe ndi yokwanira. Koma mzere wachiwiri ulibe chidziwitso chake chokha, chilichonse chiyenera kuwerengedwa kutengera ma pixel ozungulira ndi chidziwitso cha kuwala.
Malingana ngati pali kusiyana pang'ono ndi mizere yakuthwa pachithunzichi, izi siziri vuto, koma ngati mukonza chithunzicho popanga pambuyo pake, mukhoza kukumana ndi mavuto.
Ngati zambiri za Chroma zasowa pachithunzichi, simudzazipezanso. Posankha mitundu, ma pixel amayenera "kuyerekeza" kwambiri kotero kuti ma pixel amapangidwa ndi ma Chroma olakwika, kapena amatchinga ndi mitundu yofananira yomwe sagwirizana ndi zenizeni.
Ndi Chinsinsi cha Chroma zimakhala zovuta kwambiri kusunga m'mphepete mwake, osasiya utsi ndi tsitsi, deta ikusowa kuti izindikire mitundu molondola.
Gridi ya 4:4:4 sikofunikira nthawi zonse, koma ngati mukufuna kusintha chithunzicho nthawi ina, zimathandiza kukhala ndi zambiri za Chroma momwe mungathere.
Gwirani ntchito ndi ziwerengero zapamwamba kwambiri kwautali momwe mungathere, ndikungosintha kukhala mtengo wocheperako musanatsitsidwe komaliza, mwachitsanzo pa intaneti.
Moni, ndine Kim, mayi komanso wokonda kuyimitsa zoyenda komanso wodziwa zambiri pakupanga media komanso kakulidwe ka intaneti. Ndili ndi chikhumbo chachikulu chojambula ndi makanema ojambula, ndipo tsopano ndikudumphira molunjika kudziko loyimitsa. Ndi blog yanga, ndikugawana zomwe ndaphunzira ndi inu anyamata.
