Hauv kev yees duab thiab optics, nruab nrab ceev ceev lim lossis nd lim yog lub lim uas txo lossis cov xim ntawm lub teeb sib npaug yam tsis hloov lub Hawj me ntawm cov xim yug. Lub hom phiaj ntawm tus qauv yees duab nruab nrab lim dej yog txhawm rau txo cov teeb nkag mus rau lub lens. Ua li no tso cai rau tus kws yees duab xaiv qhov sib xyaw ua ke ntawm aperture, lub sij hawm raug, thiab sensor rhiab heev uas yuav txwv tsis pub tsim cov duab overexposed. Qhov no yog ua kom tiav cov teebmeem xws li qhov tob tob ntawm qhov chaw lossis qhov kev txav ntawm qhov muag plooj ntawm cov khoom hauv ntau qhov xwm txheej thiab huab cua.
Piv txwv li, ib tug yuav xav tua ib tug dej tsaws tsag ntawm ib tug qeeb shutter ceev los tsim ib tug txhob txwm ua kom pom qhov muag plooj nyhuv. Tus kws yees duab tuaj yeem txiav txim siab tias yuav tsum tau kaw qhov nrawm ntawm kaum vib nas this kom ua tiav cov txiaj ntsig xav tau. Nyob rau hnub ci heev, tuaj yeem muaj lub teeb ci ntau dhau, thiab txawm tias qhov qis tshaj plaws ntawm zaj duab xis ceev thiab qhov aperture tsawg tshaj plaws, lub shutter ceev ntawm 10 vib nas this yuav cia nyob rau hauv ntau lub teeb thiab cov duab yuav overexposed. Nyob rau hauv cov ntaub ntawv no, siv ib tug tsim nyog nruab nrab density lim yog sib npaug rau tso tseg ib los yog ntau tshaj qhov chaw nres tsheb, tso cai rau kom qeeb shutter speeds thiab qhov xav tau qhov kev xav plooj nyhuv.
Lub lim nruab hnub tsis muaj zog, tseem hu ua kev lim nd Qhov no yog qhov tseem ceeb thaum ib cheeb tsam ntawm cov duab ci ntsa iab thiab qhov seem tsis yog, zoo li hauv daim duab ntawm lub hnub poob.Cov qauv ntawm cov lim dej no yog qhov qis dua ib nrab ntawm lub lens yog pob tshab, thiab maj mam hloov mus rau lwm lub suab, xws li raws li gradient grey, gradient xiav, gradient liab, thiab lwm yam. Nws tuaj yeem muab faib ua gradient xim lim thiab gradient diffuse lim. Los ntawm qhov kev xav ntawm daim ntawv gradient, nws tuaj yeem muab faib ua mos gradient thiab nyuaj gradient. "Soft" txhais tau hais tias qhov kev hloov pauv loj, thiab rov ua dua. . Cov lim dej gradient feem ntau siv hauv kev yees duab toj roob hauv pes. Nws lub hom phiaj yog txhob txwm tshaj tawm ua rau sab sauv ntawm daim duab ua tiav ib qho kev xav tau xim xim ntxiv rau kom ntseeg tau cov xim zoo nkauj ntawm sab qis ntawm daim duab.
Cov ntxaij lim dej grey kawm tiav nruab nrab-qhov ntom ntom, tseem hu ua GND cov ntxaij lim dej, uas yog ib nrab lub teeb xa mus thiab ib nrab lub teeb thaiv, thaiv ib feem ntawm lub teeb nkag mus rau lub lens, tau siv dav. Nws yog tsuas yog siv kom tau txais kev sib raug zoo raug tso cai los ntawm lub koob yees duab hauv qhov tob tob ntawm kev yees duab, kev yees duab qis, thiab lub teeb muaj zog. Nws kuj yog feem ntau siv los sib npaug lub suab. GND lim yog siv los sib npaug qhov sib piv ntawm sab sauv thiab qis lossis sab laug thiab sab xis ntawm qhov screen. Nws yog feem ntau siv los txo qhov ci ntsa iab ntawm lub ntuj thiab txo qhov sib piv ntawm lub ntuj thiab hauv av. Ntxiv nrog rau kev ua kom pom qhov qub ntawm qhov qis, nws tuaj yeem cuam tshuam qhov ci ntsa iab ntawm lub ntuj sab saud, ua rau kev hloov pauv ntawm lub teeb thiab tsaus muag, thiab tuaj yeem ua kom pom qhov zoo nkauj ntawm huab. Muaj ntau hom GND lim, thiab greyscale kuj txawv. Nws maj mam hloov ntawm tsaus grey mus rau xim tsis muaj xim. Feem ntau, nws tau txiav txim siab siv nws tom qab ntsuas qhov sib piv ntawm qhov screen. Tshaj tawm raws li tus nqi ntsuas ntawm qhov tsis muaj xim, thiab ua qee qhov kho yog tias tsim nyog.
Post lub sij hawm: Feb-07-2023
