Vim Li Cas Koj Yuav Tsum Tau Txog Koj Lub Koob Yees Duab ADC
ADC stands rau Analog rau Digital Converter thiab hais txog lub koob yees duab digital kev muaj peev xwm los cuam tshuam kev muaj tiag thiab hloov mus rau hauv cov ntaub ntawv digital. Cov txheej txheem yuav siv tag nrho cov xim, qhov sib txawv, thiab cov ntaub ntawv tonal ntawm ib qho chaw thiab muab siv rau hauv lub ntiaj teb digital los ntawm kev siv txoj kev cai binary code ntawm tag nrho cov tshuab computer.
Tag nrho cov koob yees duab digital yog muab rau tus ADC naj npawb thiab nws tau muab tso rau hauv qhov chaw ua khoom lag luam rau txhua tus qauv. Nws yog ib qho tseem ceeb uas yuav tsum tau nkag siab txog dab tsi ADC tiag tiag, nws ua haujlwm zoo li cas, thiab vim li cas nws thiaj ua tau lub luag haujlwm hauv koj lub koob yees duab tom ntej.
ADC yog dab tsi?
Tag nrho DSLR thiab taw tes thiab tua cov koob yees duab muaj cov sensors uas muaj pixels nrog photodiodes . Cov no hloov lub zog ntawm photons rau hauv hluav taws xob nqi. Tus nqi yog hloov mus rau ib qho hluav taws xob, uas yog tom qab ntawd ntxiv mus rau theem uas nws tuaj yeem ua tiav ntxiv los ntawm cov koob yees duab digital Analog rau Digital Converter (hu ua ADC, AD Converter, thiab A / D Converter luv luv).
Tus ADC yog tus ntiv tes hauv koj cov koob yees duab thiab nws txoj hauj lwm yog cais cov teeb meem ntawm pixels mus rau theem kev ci ntsa iab thiab muab txhua theem rau tus nab npawb binary, muaj cov zeroos thiab ones. Feem ntau cov neeg siv digital koob yees duab siv tsawg kawg yog 8-ntsis ADC, uas tso cai rau txog 256 qhov tseem ceeb rau kev ci ntsa iab ntawm ib zaug xwb.
Txiav txim xyuas lub ADC ntawm Digital Digital Camera
Tus nqi qis tshaj ntawm ADC yog txiav txim siab los ntawm ntau yam kev lag luam (qhov tseeb) ntawm lub sensor . Ib qhov kev tawm tsam dav dav yuav tsum muaj tsawg kawg yog 10-ntsis ADC los ua kom muaj coob tus tones thiab kom tsis txhob muaj cov lus qhia.
Txawm li cas los xij, cov koob yees duab manufacturers feem ntau tshaj tawm qhov ADC (xws li nrog 12 cov khoom siv 10 khoom) thiaj li tso cai rau qhov yuam kev ntawm nws. Ntxiv "cov khoom" kuj tuaj yeem pab tiv thaiv kev tiv thaiv (posterization) thaum ua ntawv thov tonal curves rau cov ntaub ntawv. Txawm li cas los xij, lawv yuav tsis tsim cov ntaub ntawv ntxiv tonal, nrawm ntawm suab nrov.
Qhov No Txhais Li Cas Thaum Yuav Muas Tau Ib Lub Yeeb Tshiab?
Peb twb tau hais tias feem ntau cov neeg siv digital koob yees duab muaj 8-ntsis ADC thiab qhov no yog txaus rau cov amateurs uas yog snapping duab ntawm tsev neeg los yog ntes cov hnub poob zoo nkauj. Lub ADC plays lub luag haujlwm loj nrog cov koob yees duab DSLR ntau dua ntawm cov kws tshaj lij thiab cov neeg sib raug zoo.
Muaj ntau DSLRs muaj peev xwm ntes nrog ntau dua ADC xws li 10-ntsis, 12-ntsis, thiab 14-ntsis. Cov ADCs siab dua no yog tsim los ua kom tau qhov tseem ceeb tshaj plaws rau lub koob yees duab uas yuav ntes tau, tsim kev ntxaum ntxaum thiab cov gradients.
Qhov txawv ntawm 12-ntsis thiab 14-ntsis duab yuav tsum yog me ntsis thiab tej zaum tseem yuav tsis paub meej nyob hauv feem ntau cov duab. Ntxiv thiab, nws yog txhua yam yuav vam khom rau ntawm qhov uas muaj ntau yam ntawm koj tus sensor. Yog hais tias qhov ntau yam tsis muaj ntau yam ntxiv nrog rau ADC, ces nws tsis tuaj yeem ua haujlwm zoo hauv kev txhim kho duab zoo.
Raws li cov tshuab tseem ua kom zoo dua, yog li yuav pom cov duab zoo nkauj tonal thiab lub koob yees duab muaj peev xwm mus ntes nws.
Nws tseem yuav tsum tau sau tseg tias feem ntau DSLR koob yees duab, kev muaj peev xwm mus ntes cov duab uas siv cov ADC saum 8-yam khoom yuav tsum tau tua shooting RAW hom. JPGs tsuas pub rau txoj kab 8-ntsis ntawm cov ntaub ntawv.