Ukuqonda amaphikseli we-Digital ku-Photography
Uma ubheka imininingwane yekhamera yedijithali uzobona izinhlu ezimbili zokubalwa kwephikelli: esebenzayo futhi yangempela (noma ingqikithi).
Kungani kukhona izinombolo ezimbili futhi zisho ukuthini? Impendulo yalo mbuzo iyanzima futhi ithola ubuchwepheshe obuhle, ngakho ake sibuke ngamunye.
Yiziphi Amaphikseli Asebenzayo?
Izinzwa zithombe zekhamera zedijithali zinezinombolo zamaphikseli , eziqoqa ama-photons (amandla okukhanya kagesi). I-photodiode bese iguqula i-photons ibe yikhokhishini kagesi. I-pixel ngayinye ine-photodiode eyodwa kuphela.
Amaphikseli asebenzayo angamaphikseli athola idatha yesithombe. Ziyasebenza futhi ngencazelo, izindlela ezisebenzayo "zempumelelo ekukhiqizeni umphumela oyifunayo noma umphumela ohlosiwe." Lawa amaphikseli enza umsebenzi wokuthatha isithombe.
Inzwa evamile, ngokwesibonelo, ikhamera ye-12MP ( megapixel ) inenani elilingana lamaphikseli asebenzayo (11.9MP). Ngakho-ke, amaphikseli asebenzayo abhekisela endaweni yensiza ukuthi i-pixel 'esebenzayo' ifihla.
Ngezikhathi ezithile, akuwona wonke amaphikseli enzwa angasetshenziswa (isibonelo, uma i-lens ingakwazi ukumboza uhla lwensisindo lonke).
Yiziphi Ama-Pixel Actual?
Ukubalwa kwamaphikseli wangempela, noma okuphelele, we-pixel okufaka phakathi (cishe) 0.1% wamaphikseli asele ngemuva kokubala amaphikseli asebenzayo. Zisetshenziselwa ukunquma imiphetho yesithombe nokunikeza ulwazi lombala.
La maphikseli asele asele eceleni komshini wesithombe futhi avikelekile ekutholeni ukukhanya kodwa asetshenziswa njengengxenye yokukhomba engasiza ekunciphiseni umsindo. Bathola isignali esitshela inzwa ukuthi okwamanje 'omnyama' okwakhiwe ngesikhathi kuvezwa futhi ikhamera iyawubuyisela lokho ngokulungisa inani lamaphikseli asebenzayo.
Lokhu kusho ukuthini ukuthi ukukhanya okude isikhathi eside, njengalezo ezithathwe ebusuku, kufanele kube nokunciphisa inani lomsindo ezindaweni ezimnyama ezithombeni. Kube nemisebenzi eminingi yokushisa ngenkathi i-shutter yekhamera ivulwa, okwenza lezi pixel ezinqenqemeni zisebenze, zitshela inzwa yekhamera ukuthi kungenzeka kube nezindawo eziningi zethunzi ezizokhathazeka ngazo.
Yiziphi amaphikseli aPolitiki?
Esinye isici sokukhathazeka ngezinzwa zekhamera ukuthi ezinye amakhamera angakwazi ukuphendula inombolo yamaphikseli wenzwa.
Isibonelo, ikhamera ye-6MP ingakwazi ukukhiqiza izithombe ezingu-12MP. Kulesi simo, ikhamera ingeza amaphikseli amasha eduze kwama-megapixel angu-6 athunjiwe ukudala ama-megapixel angu-12 wolwazi.
Usayizi wefayili ukwandiswa futhi lokhu empeleni kuholela esithombeni esingcono kunokuba ungabe usuphendula phakathi kwesofthiwe yokuhlela isithombe ngoba ukuphoqelelwa kwenziwa ngaphambi kokucindezelwa kwe-JPG.
Kodwa-ke, kubalulekile ukukhumbula ukuthi ukubamba iqhaza akukwazi ukudala idatha engazange ifakwe kuqala. Umehluko ngekhwalithi uma usebenzisa ukubethelwa kwekhamera kumakhamera.