Digital artifacts yog qhov tsis xav tau, tsis xav hloov pauv hauv cov duab uas tshwm sim los ntawm kev ua haujlwm sab hauv ntawm koj lub koob yees duab. Lawv tuaj yeem tshwm sim hauv DSLR thiab cov koob yees duab taw tes thiab tua thiab txo cov duab zoo tag nrho. Nov yog saib ntau hom duab artifacts.
Blooming
Pixels ntawm DSLR sensor sau photons, uas tau hloov mus rau hauv hluav taws xob. Txawm li cas los xij, cov pixels qee zaus sau ntau cov photons, uas ua rau muaj hluav taws xob ntau dhau. Qhov dej ntws tuaj yeem ntws mus rau cov pixels uas twb muaj lawm, ua rau muaj ntau dhau ntawm cov duab. Qhov no yog hu ua blooming. Feem ntau niaj hnub DSLRs muaj cov rooj vag tawm tsam uas pab tshem tawm cov nqi ntau dhau.
Chromatic Aberration
Chromatic aberration tshwm sim feem ntau hauv cov duab tua nrog lub lens dav; nws pom tau tias yog xim fringing nyob ib ncig ntawm high-contrast npoo. Nws yog tshwm sim los ntawm lub lens tsis tsom wavelengths ntawm lub teeb mus rau tib lub dav hlau focal. Tej zaum koj yuav tsis pom nws ntawm lub vijtsam LCD, tab sis koj yuav thaum kho. Feem ntau, nws yog xim liab lossis xiav xiav raws li cov ntsiab lus ntawm ntug.
Txhawm rau tiv thaiv qhov no, siv lo ntsiab muag nrog ob lossis ntau daim iav uas muaj qhov sib txawv refractive.
'Jaggies' lossis Aliasing
Qhov no yog hais txog qhov pom jagged npoo ntawm kab kab pheeb ces kaum hauv cov duab digital. Pixels yog square (tsis puag ncig), thiab vim hais tias ib kab kab pheeb ces kaum muaj cov square pixels, aliasing tuaj yeem zoo li cov kauj ruam thaum cov pixels loj.
Jaggies ploj nrog lub koob yees duab siab dua vim tias cov pixels me dua. DSLRs muaj lub peev xwm los tiv thaiv tus kheej vim lawv nyeem cov ntaub ntawv los ntawm ob sab ntawm ntug, yog li softening cov kab.
Sharpening hauv kev tsim khoom tom qab nce qhov pom ntawm jaggies, uas yog vim li cas ntau cov ntxaij lim dej sharpening muaj qhov ntsuas tiv thaiv. Tsis txhob ntxiv ntau dhau los tiv thaiv aliasing; nws tuaj yeem txo cov duab zoo.
JPEG Compression
JPEG yog hom ntawv yees duab ntau tshaj plaws, txawm tias muaj kev sib pauv ntawm cov duab zoo thiab qhov loj me. Thaum koj khaws cov ntaub ntawv ua JPEG, koj compress cov duab thiab poob me ntsis zoo.
Yog tias koj npaj yuav hloov pauv ntau rau ib daim duab, khaws nws thawj zaug hauv cov ntawv uas tsis tau sau tseg, xws li PSD lossis TIFF.
Moire
Thaum ib daim duab muaj qhov rov ua dua ntawm qhov zaus, cov ntsiab lus no tuaj yeem dhau qhov kev daws teeb meem ntawm lub koob yees duab. Qhov no ua rau moire, uas zoo li wavy xim kab ntawm daim duab.
Moire feem ntau tsis yog qhov tseem ceeb nrog lub koob yees duab siab. Yog tias koj li muaj qis dua pixel suav, koj tuaj yeem siv cov ntxaij lim dej los tiv thaiv lub npe los kho moire, txawm tias lawv ua kom cov duab muag muag.
Noise
Suab nrov tshwm ntawm cov duab raws li qhov tsis xav tau lossis cov xim tsis zoo, feem ntau tshwm sim los ntawm kev tsa ISO. Nws yog qhov pom tseeb tshaj plaws hauv cov duab ntxoov ntxoo thiab cov xim dub ntawm cov duab, feem ntau raws li cov me me ntawm liab, ntsuab, thiab xiav.
Txhawm rau txo suab nrov, siv qhov qis dua ISO. Qhov no yuav txi ceev thiab yog thawj qhov laj thawj rau kev mus tsuas yog siab npaum li qhov tsim nyog kiag li thaum xaiv ISO.
