Nkag siab Yuav ua li cas kom tsis txhob muaj kev txhawj xeeb hloov hauv koj cov duab
Cov artifacts yog cov kev hloov pliaj uas tshwm sim hauv cov duab uas yog tshwm sim los ntawm ntau yam hauv lub koob yees duab digital. Cov tuaj yeem tshwm nyob rau hauv ob qho tib si DSLR lossis qhov taw qhia thiab tua cov koob yees duab thiab ua rau txo cov duab zoo.
Cov xov xwm zoo tshaj yog tias los ntawm kev to taub cov duab sib txawv ntawm artifacts, lawv tuaj yeem siv tau (rau ntau feem) yuav tsum tau raug zam los yog raug kho dua ua ntej ib daim duab txawm tias twb raug lawm.
Blooming
Pixels ntawm ib lub DSLR sensor sau photons, uas tau hloov mus ua hluav taws xob. Txawm li cas los, lub pixels tuaj yeem sau ntau photons, uas ua rau muaj kev txeej ntawm hluav taws xob nqi. Cov txeej no muaj peev xwm txeej tau mus rau cov pixels uas twb muaj lawm, uas ua rau ntau tshaj qhov chaw ntawm cov duab. Qhov no yog hu ua blooming.
Feem ntau cov niaj hnub no DSLRs tau thaiv cov qhov rooj vag uas tau pab kom ntws tawm qhov kev tshaj nyiaj no.
Chromatic Aberration
Chromatic aberration tshwm sim feem ntau thaum tua nrog lub lens wide-angle thiab nws yog pom raws li xim khov ntawm ib qho kev sib txawv ntawm cov sib npaug. Nws yog tshwm sim los ntawm lub lens tsis yog tsom cov wavelengths ntawm lub teeb rau ntawm qhov chaw focal tib yam. Koj yuav tsis pom nws ntawm lub vijtsam sab nraum LCD, tab sis nws yuav pom tau thaum lub sij hawm kho thiab feem ntau yuav yog xim liab los yog cyan txheej txheem ntawm ib sab kawm.
Nws muaj peev xwm raug kho los ntawm kev siv lo ntsiab muag uas muaj ob los sis ntau daim iav uas muaj ntau yam zoo heev.
Jaggies lossis Aliasing
Qhov no yog hais txog qhov pom ntawm cov kab uas pom pom ntawm cov kab hauv cov kab hauv cov duab. Pixels yog square (tsis hloov) thiab vim hais tias kab pheeb ces kaum muaj cov txheej xwm square pixels nws tuaj yeem zoo li cov theem ntaiv thaum lub pixels loj.
Jaggies ploj nrog dua rooj koob yees duab vim hais tias cov pixels yog me. DSLRs muaj cov khoom siv tiv thaiv los ntawm kev ua haujlwm, raws li lawv yuav nyeem cov ntaub ntawv los ntawm ob tog ntawm ntug, yog li softening cov kab.
Kev sib koom hauv kev tsim tawm ntau yuav ua rau pom kev pom ntawm jaggies thiab yog vim li cas thiaj muaj ntau yam ntxig ntxig lim dej uas muaj cov kev nplua los tiv thaiv. Kev saib xyuas yuav tsum tau ua kom tsis txhob muab ntau cov tshuaj tiv thaiv ntau dua li nws tuaj yeem txav tau duab zoo.
JPEG Compression
JPEG yog hom luam ntau tshaj plaws uas siv los pab txuag cov duab yees duab. Txawm li cas los, JPEG muab kev lag luam tawm ntawm cov duab zoo thiab cov duab loj.
Txhua txhua lub sij hawm koj txuag tau cov ntaub ntawv ua ib lub jpeg, koj compress cov duab thiab poob zoo dua . Ib yam li ntawd, txhua zaus koj qhib thiab kaw ib qho JPEG (txawm tias koj ua tsis tau editing rau nws), koj tseem poob zoo.
Yog tias koj npaj yuav hloov ntau qhov duab, nws yog qhov zoo tshaj los txuag nws thawj zaug hauv ib qho kev ua tsis tau zoo, xws li PSD lossis TIFF .
Moire
Thaum twg ib daim duab muaj qhov chaw qub, qhov no yuav tshaj cov koob yees duab ntawm lub koob yees duab . Qhov no ua rau moire, uas zoo li cov laim ntsa xim ntawm cov duab.
Moire feem ntau yog tshem tawm ntawm cov koob yees duab dua. Cov neeg uas muaj pes tsawg tus pixel suav tau siv cov cuab yeej los tiv thaiv kev cai los mus kho qhov teeb meem ntawm moire, tab sis lawv ua kom muag daim duab.
Lub suab nrov
Qis nrov qhia rau cov duab li cov pliaj los sis cov xim stray xim, thiab suab nrov feem ntau tshwm sim los ntawm raising ISO ntawm lub koob yees duab . Nws yuav yog qhov tseem ceeb tshaj plaws nyob rau hauv qhov ntxoov ntxoo thiab dub ntawm ib daim duab, feem ntau yog me me ntawm liab, ntsuab, thiab xiav.
Zaum yuav raug txo los ntawm kev siv ib sab ISO, uas yuav ua kev txi ceev thiab yog thawj qhov laj thawj rau tsuas yog siab mus raws li siab xav tau thaum xaiv ISO.