To taub Digital Pixels nyob rau hauv Photography
Yog tias koj saib cov lus ntawm cov koob yees duab digital koj yuav pom ob lub npe rau cov pixel suav: siv tau thiab muaj tseeb (lossis tag nrho).
Vim li cas thiaj muaj ob tug lej thiab lawv txhais li cas? Lo lus teb rau lo lus nug no nyuaj thiab tau txais kev zoo nkauj, yog li cia wb saib txhua yam.
Dab tsi yog Pixels zoo?
Cov koob yees duab duab sensors txhaj ntawm pixels , uas sau photons (zog hnab teeb ntawm lub teeb). Lub photodiode ces hloov cov photons rau hauv hluav taws xob nqi. Txhua pixel muaj tsuas yog ib qho photodiode.
Cov pixels zoo yog cov pixels uas tau nqa cov duab cov ntaub ntawv. Lawv ua tau zoo thiab los ntawm txhais, txhais tau hais tias "muaj txiaj ntsig hauv kev tsim cov txiaj ntsig yam xav tau los yog cov txiaj ntsig tsim." Cov no yog cov pixels uas ua cov hauj lwm ntawm kev ntes cov duab.
Ib lub cim sensor nyob rau hauv, piv txwv li, ib lub koob yees duab 12MP ( megapixel ) muaj qhov sib luag ntawm cov pixels yuav luag (11.9MP). Yog li, zoo pixels hais txog thaj tsam ntawm lub sensor uas 'ua haujlwm' pixels npog.
Nyob rau lub sijhawm, tsis yog tag nrho cov duab cwj pixels (piv txwv li, yog tias lub lens tsis kam them tag nrho cov khoom cim dav hlau).
Dab tsi yog Pixels tseeb?
Qhov tseeb, los yog tag nrho, pixel suav ntawm lub koob yees duab sensor suav tias (kwv yees) 0.1% ntawm pixels tu qab tom qab suav cov pixels. Lawv raug siv los txiav txim rau cov duab ntawm cov duab thiab muab cov ntaub ntawv xim.
Cov seem pixels kab ntug ntawm tus duab sensor thiab yog thaiv los ntawm kev pom lub teeb, tiam sis tseem siv raws li cov tswv yim uas yuav pab tau txo cov suab nrov. Lawv tau txais ib lub teeb liab uas qhia tau tias lub cim qhov muag 'tsaus nti' tam sim no tau tshwm sim thaum lub sij hawm raug thiab lub koob yees duab them rau qhov ntawd los ntawm kev kho qhov tseem ceeb ntawm kev siv pixels.
Qhov no txhais tau li cas rau koj yog tias cov kev kis ntev, xws li cov neeg tau noj hmo, yuav tsum tau txo qhov suab nrov nyob hauv cov cheeb tsam dub dub ntawm daim duab. Muaj ntau thermal ua haujlwm thaum lub koob yees duab shutter tau qhib, uas ua rau cov ntug pixels los qhib, qhia lub koob yees duab sensor uas yuav muaj ntau qhov chaw ntxoov ntxoo rau kev txhawj xeeb nrog.
Dab tsi yog Interpolated Pixels?
Lwm qhov zoo ntawm kev txhawj xeeb nrog lub koob yees duab sensors yog tias qee cov koob yees duab muaj peev xwm cuam tshuam tus naj npawb ntawm sensor pixels.
Piv txwv li, ib lub koob yees duab 6MP tuaj yeem tsim cov duab 12MP. Nyob rau hauv cov ntaub ntawv no, lub koob yees duab ntxiv cov tshiab pixels ntawm 6 megapixels nws ntes los tsim 12 megapixels ntawm cov ntaub ntawv.
Cov ntaub ntawv loj yog ntau zog thiab qhov no ua tau zoo hauv cov duab zoo dua yog tias koj yuav tsum tuaj cuam tshuam rau hauv ib qho duab editing software vim hais tias qhov kev sib nkag siab ua ntej ua ntej JPG compression.
Txawm li cas los, nws tseem ceeb heev kom nco ntsoov tias interpolation yuav tsis puas tsim cov ntaub ntawv uas tsis yog ntes ua tus xub place. Qhov txawv ntawm qhov zoo thaum siv cov duab nyob rau hauv lub koob yees duab yog marginal.