Pavel Jelic Idan kun kasance ɗaya daga cikin masu amfani waɗanda suke son saita samfuran su bisa ga ra'ayinsu don dacewa da su gwargwadon yiwuwa, to tabbas kun ci karo da sashin saitunan Apple TV. Bidiyo da sauti da abu Chrome. Tare da wannan zaɓi, suna samuwa akan Apple TV zabi biyu, wanda zaka iya zaba daga ciki. Koyaya, gaskiyar ita ce, masu amfani na yau da kullun waɗanda ba sa ma'amala da bayanai kuma, yuwuwar, nunin fasahar, wataƙila ba su san ma'anar zaɓin Chroma ba da kuma saitunan da ya kamata su zaɓa. A cikin wannan labarin, bari mu dubi tare da abin da chroma ke nufi da kuma inda za a iya saita shi a cikin tvOS.
Zai iya zama sha'awar ku
Yawo a duniya tare da Apple Menene chroma?
Samfurin chroma Ni irin namiji ne matsawa, tare da taimakon wanda rage girman bayanin launi. An raba siginar bidiyo zuwa na al'ada manyan bangarori biyu - bayanai game da haske (luma) da bayanai game da launi (chroma). Bayani game da haske (luminance, taƙaitaccen luma), ya bayyana matakin haske na hoton da aka watsa, don haka i bambanci. Luma ya bayyana babban bangare na dukan hoton, sabili da haka hoton baki-da-fari bai yi kama da cikakken bayani ba fiye da launi daya. Bayani game da launi (chrominance, chroma da aka rage), ana kuma amfani da su don watsa hoto muhimmanci, amma ba kamar luma ba - a sauƙaƙe, chroma yana da ƙarancin tasiri akan bayyanar hoton gaba ɗaya. Saboda haka, a lokacin watsa hoto, abin da ake kira subsampling, saboda haka rage adadin bayanan launi da aka watsa. Godiya ga gaskiyar cewa girman bayanan launi da aka watsa ya ragu, yana yiwuwa a watsa ƙarin bayani game da haske, kuma hoton da aka samu zai iya zama mai haske dangane da mafi inganci kuma mafi daidai. A lokaci guda kuma, za a adana shi tsabtar hoto kuma a lokaci guda za ku iya rage girman dukan fayil ɗin bidiyo har zuwa o 50%.
Ta yaya aka ƙayyade chroma?
Akwai saitin a cikin tvOS 4:2:2 ko 4:2:0, duk da haka, ya kamata a lura cewa za mu iya fuskantar saituna 4:4:4. Lambar farko koyaushe yana nunawa a cikin waɗannan jerin lambobi girman samfurin. Na gaba lambobi biyu suna da dangantaka gurguwa Duk waɗannan lambobin suna da alaƙa da kuma ayyana lambar farko a kwance a samfurin tsaye. An fi kwatanta wannan da misali. Saituna 4:4:4 baya amfani babu matsawa, Don haka babu wani abu da ba a yi la'akari da shi ba - a cikin wannan yanayin akwai ɗaukar nauyi cikakken bayani game da haske da launi. Saituna 4:2:2 sannan watsawa rabi bayani game da launi - ya zo a kwance subsampling. 4:2:0 watsa kwata kwata bayani game da launi, don haka se jere daya bayanin launi gaba daya ya rasa. Don ƙarin fahimtar wannan batu. gallery A ƙasan wannan sakin layi za ku sami hotuna masu alaƙa da saitunan samfurin chroma.
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Masana'antar fim da chroma
Tun da yawancin mu muna amfani da Apple TV da farko don kallon nunin, za mu kalli yadda samfurin chroma ke shafar fina-finai, jerin, da sauran bidiyo. Amfani da samfurin chroma ya zama ruwan dare gama gari a masana'antar fim a halin yanzu 4: 2: 0. Babban dalili shi ne kasancewar idon ɗan adam a zahiri ba shi da damar da za ta iya bambancewa da farko a duban bambanci tsakanin 4:2:0 da 4:4:4, wanda ba ya amfani da kowane matsi. Yaushe 4:2:0 ko da yake akwai tabbatacciyar asarar bayanin launi, amma ba shakka ba game da babu wani m. Tsarin 4:2:0 kuma ana yawan amfani dashi don Blu-ray fayafai kuma a wasu lokuta lokacin da kake son samun fim ɗin a cikin "mafi kyau" mai yiwuwa inganci. Bambance-bambance tsakanin saitunan samfurin chroma sun fi gani idan yana kan allo ƙaramin rubutu. Game da subsampling, abin da ake kira kayan tarihi. Kuna iya samun a ƙasa gallery, wanda zaku iya duba waɗancan kayan tarihi daban don kowane tsari.
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Yadda ake saita Chroma a cikin tvOS?
A cikin Apple TV, muna da saitunan Chroma da ake samu a cikin tsari 4:2:0 wanda 4:2:2, lokacin da aka zaba ta tsohuwa 4: 2: 0. Kamar yadda zaku iya karantawa daga layin da aka lissafa a sama, tsarin 4: 2: 0 shine mafi ƙarancin inganci a wannan yanayin, tunda a cikin yanayin "kawai" kashi ɗaya cikin huɗu na bayanan launi ana watsa shi. An zaɓi wannan saitin musamman saboda mutane galibi suna amfani da kebul na HDMI na yau da kullun, waɗanda kawai ba za su iya ɗaukar tsarin 4: 2: 2 ba. Don haka ya kamata a tsara tsarin 4:2:2 ta irin waɗannan mutanen da suke da ita a hannunsu high-gudun da kuma high quality-HDMI na USB. Idan kuna son canza saitunan Chroma a cikin tvOS, je zuwa Saituna -> Bidiyo & Audio -> Chroma. Idan kuna ƙoƙarin saita tsarin 4:2:2, don haka Apple TV zai faɗakar da ku sannan ku gwada gwajin igiyoyin ku. Idan igiyoyin ku sun wuce, haka tsarin zai kasance 4: 2: 2 kafa, in ba haka ba za a yi maido da saitunan asali, don haka 4: 2: 0.
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