Mmene Mungapewere Zopangira Zithunzi Zithunzi

Kumvetsetsa Mmene Mungapewere Kusintha Kosafunika Kwambiri pa Zithunzi Zanu Zamagetsi

Zojambulajambula ndizomwe zili zosafunika zomwe zimachitika m'chithunzi chomwe chimayambitsidwa ndi zinthu zosiyanasiyana mkati mwa kamera ya digito. Zikhoza kuoneka mu DSLR kapena mfundo ndi kuwombera makamera ndikupangitsa kuti pakhale chithunzi.

Nkhani yabwino ndi yakuti pozindikira mitundu yosiyanasiyana ya mafano, iwo angathe (kapena mbali zambiri) kuti asagwiritsidwe kapena kukonzedwa chisanadze chithunzi.

Kukula

Ma pixels pa chipangizo cha DSLR amasonkhanitsa photons, zomwe zimasinthidwa kukhala magetsi. Komabe, ma pixel akhoza nthawi zina kusonkhanitsa photons zambiri, zomwe zimachititsa kusefukira kwa magetsi. Izi zikusefukira zimatha kutaya ma pixel omwe alipo, kuchititsa kuti pakhale malo oposa. Izi zimadziwika kuti zikufalikira.

DSLRs zamakono zamakono zili ndi zipata zosamalidwa zomwe zimathandiza kuthetsa ngongole yowonjezera.

Chromatic Aberration

Kuthamangitsidwa kwa Chromatic kumachitika kawirikawiri pamene kuwombera ndi lens lalikulu kwambiri ndipo kumawonekera ngati mtundu ukululira kuzungulira mapiri osiyana. Zimayambitsidwa ndi mandala osayang'ana kuwala kwawunikira pa ndege yomweyo. Simungakhoze kuziwona pawindo la LCD, koma likhoza kuwonetsedwa panthawi yokonza ndipo kawirikawiri lidzakhala loyimira lofiira kapena lachikasu pamphepete mwa mutuwo.

Ikhoza kuthandizidwa pogwiritsira ntchito lens omwe ali ndi magalasi awiri kapena angapo omwe ali ndi makhalidwe osiyana siyana.

Jaggies kapena Aliasing

Izi zimatanthawuza kumphepete zowonekera zogwirizana ndi diagonal mu chithunzi cha digito. Ma pixels ali ozungulira (osati kuzungulira) ndipo chifukwa mzere wozungulira umakhala ndi mapepala ang'onoang'ono omwe angayang'ane ngati masitepe angapo pamene ma pixelisi ali aakulu.

Jaggies amawonongeka ndi makamera apamwamba kwambiri chifukwa mapilosi ndi ang'onoang'ono. DSLRs mwachibadwa ali ndi luso loletsa anti-aliasing, pamene adzawerenga mfundo kuchokera kumbali zonse ziwiri, ndikuchepetsa mzere.

Kukulitsa polemba posachedwa kudzawonjezera kuonekera kwa jaggies ndipo ndicho chifukwa chake ambiri akuwongolera mafayilo ali ndi anti-alias scale. Chisamaliro chiyenera kutengedwa kupeĊµa kuwonjezera anti-alias kwambiri momwe zingatithandizenso kuchepetsa khalidwe la zithunzi.

JPEG Kupanikiza

JPEG ndi mafayilo ojambula zithunzi omwe amagwiritsidwa ntchito kupulumutsa mafayilo ajambula. Komabe, JPEG imapereka malonda pakati pa khalidwe la zithunzi ndi kukula kwazithunzi.

Nthawi iliyonse mukasunga fayilo monga JPEG, mumagwirizanitsa chithunzicho ndi kutayika pang'ono . Mofananamo, nthawi iliyonse mutatsegula ndi kutseka JPEG (ngakhale mutasintha ayi), mumataya khalidwe.

Ngati mukukonzekera kusintha zambiri pa fano, ndibwino kuti mupulumutse poyamba pazithunzi zosasinthika, monga PSD kapena TIFF .

Moire

Pamene fano ili ndi malo obwerezabwereza afupipafupi, izi zikhoza kupitirira chisankho cha kamera . Izi zimayambitsa moire, yomwe imawoneka ngati mizere yowunikira pa chithunzicho.

Moire nthawi zambiri amachotsedwa ndi makamera apamwamba kwambiri. Amene ali ndi chiwerengero cha pixel chochepa angagwiritse ntchito ma filt anti-aliasing kuti athetse vuto la moire, ngakhale kuti amachepetsa fanolo.

Mkokomo

Phokoso limasonyeza zithunzi ngati zosafuna kapena zovuta za mtundu, ndipo phokoso limayamba chifukwa chokweza ISO ya kamera . Zidzakhala zooneka mumthunzi ndi akuda a fano, nthawi zambiri ngati madontho aang'ono ofiira, obiriwira, ndi abuluu.

Phokoso likhoza kuchepetsedwa pogwiritsira ntchito ISO yapansi, yomwe idzapereka nsembe mofulumira ndipo ndicho chifukwa chachikulu chokhalira chokwera ngati chofunikira kwambiri pakusankha ISO.