Pavel Jelic Ngati ndinu m'modzi mwa ogwiritsa ntchito omwe amakonda kukhazikitsa malonda awo mwakufuna kwawo kuti agwirizane nawo momwe angathere, ndiye kuti mwapeza gawo la zokonda za Apple TV. Video ndi zomvera ndi chinthu Chrome. Ndi njira iyi, amapezeka pa Apple TV njira ziwiri, zomwe mungasankhe. Komabe, chowonadi ndi chakuti ogwiritsa ntchito wamba omwe samakumana ndi chidziwitso komanso, mwina, matekinoloje, mwina sakudziwa zomwe Chroma imatanthauza komanso zomwe ayenera kusankha. M'nkhaniyi, tiyang'ane pamodzi zomwe chroma imatanthauza komanso komwe ingakhazikitsidwe mu tvOS.
Izo zikhoza kukhala chidwi inu
Kuwuluka padziko lonse lapansi ndi Apple Kodi chroma ndi chiyani?
Chroma zitsanzo Ndine ngati mnyamata kupsinjika, ndi chithandizo chomwe kuchepetsa kukula kwa chidziwitso cha mtundu. Chizindikiro cha kanema chimagawidwa mwachikale mbali ziwiri zazikulu - zambiri za kuwala (luma) ndi zambiri za mtundu (chroma). Zambiri za kuwala (luminance, abbreviated luma), amatanthauzira mulingo wowala wa chithunzi chofalitsidwa,ndipo i kusiyana. Luma amatanthauzira gawo lalikulu cha chithunzi chonse, choncho chithunzi chakuda ndi choyera sichiwoneka chochepa kwambiri kuposa mtundu umodzi. Zambiri za mtundu (chrominance, chidule cha chroma), amagwiritsidwanso ntchito potumiza zithunzi zofunika, koma osati monga luma - mwachidule, chroma ilibe mphamvu zochepa pa maonekedwe onse a chithunzicho. Choncho, pa chithunzi kufala, otchedwa sampuli, choncho kuchepetsa kuchuluka kwa mauthenga amtundu wofalitsidwa. Chifukwa chakuti kukula kwa deta yopatsirana kumachepetsedwa, ndizotheka kufalitsa zambiri zokhudza kuwala, ndipo chithunzicho chikhoza kukhala chowala kwambiri. zabwino komanso zolondola. Panthawi imodzimodziyo, idzasungidwa chithunzi kumveka ndipo pa nthawi yomweyo mukhoza kuchepetsa kukula kwa kanema wapamwamba mpaka o 50%.
Kodi chroma imatchulidwa bwanji?
Kusintha kulipo mkati mwa tvOS 4:2:2 kapena 4:2:0,. komabe, ziyenera kudziwidwa kuti titha kukumananso ndi zoikamo 4:4:4 . Nambala yoyamba nthawi zonse zimasonyeza mu mndandanda wa manambala awa kukula kwachitsanzo. Dalisí manambala awiri zimagwirizana olumala. Ziwerengero zonsezi zimagwirizana ndi kutanthauzira nambala yoyamba yopingasa a ofukula zitsanzo. Izi zikufotokozedwa bwino ndi chitsanzo. Zokonda 4:4:4 sagwiritsa ntchito palibe compression, kotero palibe undersampling - mu nkhani iyi pali carryover zambiri za kuwala ndi mtundu. Zokonda 4:2:2 kenako amatumiza theka zambiri za mtundu - zimafika horizontal subsampling. 4:2:0 amatumiza kotala zambiri za mtundu, kotero se mzere umodzi zambiri zamtundu kwathunthu amaphonya. Kuti timvetsetse bwino mutuwu, zithunzi Pansipa ndimeyi mupeza zithunzi zokhudzana ndi makonda a chroma sampling.
Zithunzi
Makampani opanga mafilimu ndi chroma
Popeza ambiri aife timagwiritsa ntchito Apple TV makamaka kuwonera makanema, tiwona momwe chroma sampling imakhudzira makanema, mndandanda, ndi makanema ena. Kugwiritsa ntchito zitsanzo za chroma ndikofala kwambiri pamakampani opanga mafilimu pakadali pano 4: 2: 0. Chifukwa chachikulu ndi chakuti diso la munthu silikhala ndi mwayi wosiyanitsa poyang'ana koyamba kusiyana pakati pa 4: 2: 0 ndi 4: 4: 4, yomwe sigwiritsa ntchito kuponderezana kulikonse. Liti 4:2:0 ngakhale pali zina kutayika kwa chidziwitso cha mtundu, koma si zachidziwikire palibe chovuta. Mtundu 4:2:0 imagwiritsidwanso ntchito kwambiri Blu-ray zimbale ndi zina pamene mukufuna filimu mu "zabwino" zotheka khalidwe. Kusiyana pakati pa makonda a chroma sampling kumawonekera kwambiri ikakhala pazenera mawu ang'onoang'ono. Pankhani ya subsampling, otchedwa zinthu zakale. Mutha kupeza pansipa gallery, momwe mungawonere zinthuzo padera pamtundu uliwonse.
Momwe mungakhazikitsire Chroma mu tvOS?
Mu Apple TV, tili ndi zoikamo za Chroma zomwe zikupezeka mumtundu 4:2:0 amene 4:2:2,. ikasankhidwa mwachisawawa 4: 2: 0. Monga momwe mungawerenge kuchokera pamizere yomwe ili pamwambapa, mawonekedwe a 4: 2: 0 ndi khalidwe lotsika kwambiri pankhaniyi, chifukwa chake "kokha" gawo limodzi mwa magawo atatu a mtundu wa deta amafalitsidwa. Kukonzekera uku kumasankhidwa makamaka chifukwa anthu nthawi zambiri amagwiritsa ntchito zingwe za HDMI wamba, zomwe sizimatha kufalitsa mawonekedwe a 4:2:2. Choncho, dongosolo la 4:2:2 liyenera kukhazikitsidwa ndi anthu amene ali nalo yothamanga kwambiri komanso yapamwamba kwambiri ya HDMI chingwe. Ngati mukufuna kusintha makonda a Chroma mu tvOS, pitani ku Zokonda -> Kanema & Audio -> Chroma. Ngati muyesa kukhazikitsa mawonekedwe 4:2:2,. kotero Apple TV adzakuchenjezani ndiyeno kuyesa zingwe zanu. Ngati zingwe zanu zidutsa, momwemonso mawonekedwe 4:2:2 seti, mwinamwake padzakhala kubwezeretsa zoikamo zoyambirira, kuti 4: 2: 0.
Zithunzi
