Kungani Kufanele Uzinake Nge-ADC Yekhamera Yakho
I-ADC imele i-Analog kuya ku-Digital Converter iphinde ibhekisele ekukhono kwekhamera yedijithali ukumbamba iqiniso futhi uyiguqule ibe ifayela ledijithali. Inqubo ithatha yonke imibala, ukungafani, nokwaziswa kwe-tonal yesigcawu futhi iyishintsha kwizwe ledijithali ngokusebenzisa ikhodi eyisisekelo kanambambili yawo wonke ubuchwepheshe bekhompyutha.
Zonke amakhamera zedijithali abelwa inombolo ye-ADC futhi inikezwa ngokucaciswa kobuchwepheshe bomklamo kumodeli ngamunye. Kubalulekile ukuqonda ukuthi yi-ADC ngempela, ukuthi isebenza kanjani nokuthi kungani ingadlala indima ekuthengeni kwakho kwekhamela.
Iyini i-ADC?
Yonke i- DSLR kanye nephoyinti nokudubula amakhamera inezinzwa eziqukethe amaphikseli anama-photodiodes . Lawa aguqula amandla we-photons ibe yikhokhithi kagesi. Leyo khokhwa ishintshelwa emotheni, ekhuliswa kuze kube yilapho ingacubungulwa khona nge-Analog kuya Digital Converter yekhamera yedijithali (ebizwa ngokuthi i-ADC, AD Converter, ne-A / D Converter okwesikhashana).
I-ADC iyi-chip ngaphakathi kwekhamera yakho yedijithali futhi umsebenzi wayo ukuhlukanisa izintambo zamaphikseli zibe amazinga okukhanya futhi unikeze ngalinye lelizinga kwinombolo kanambambili, ehlanganisa ama-zero kanye nawo. Amakhamera amaningi edijithali omthengi asebenzisa okungenani i-AD-8-bit, evumela amanani angama-256 ekukhanyeni kwe-pixel eyodwa.
Ukunquma i-ADC ye-Digital Camera
Isilinganiso esincane semali ye-ADC sinqunywa ububanzi obushukumisayo (ngokunemba) kwenzwa . Ibanga elikhulu elinamandla lizodinga okungenani i-AD-10 bit ukukhiqiza inani elikhulu lamathoni nokugwema noma yikuphi ukulahlekelwa kolwazi.
Noma kunjalo, abakhiqizi bekhamera bavame ukucacisa i-ADC (njengama-bits angu-12 esikhundleni sama-10 bits) ukuze uvumele noma yimaphi amaphutha kuwo. Ama-"bits" angeziwe angasiza futhi ekuvimbeleni ukufaka ama-banding (okuthunyelwe ngemuva) uma usebenzisa i-cural ye-tonal kudatha. Noma kunjalo, ngeke zikhiqize ulwazi oluthe xaxa lwe-tonal, ngaphandle komsindo.
Lokho Kusho Ukuthini Uma Uthenga Ikhamera Entsha?
Sitshilo kakade ukuthi amakhamera amaningi edijithali omthengi ane-ADC engu-8-futhi lokhu kwanele abalingisi abafiphaza izithombe zomndeni noma abamba ukushona kwelanga okuhle. I-ADC idlala indima enkulu nakamakhamera e-DSLR aphezulu-ekupheleni kumazinga ochwepheshe kanye nabasebenzisi beprosumer.
Ama-DSLR amaningi anakho ukuthatha nge-ADC ephakeme efana no-10-bit, 12-bit, no-14-bit. Lawa ma-ADC aphakeme aklanyelwe ukwandisa amanani we-tonal angakghona ukuwathatha, ukudala izithunzi ezijulile nama-gradients abushelelezi.
Umehluko phakathi kwesithombe esingu-12-bit no-14-bit uzoba mncane kakhulu futhi ungase ungaqondakali eminengi yezithombe. Futhi, konke kuzoxhomeka kuleso sigaba esinamandla senzwa yakho. Uma uhla olushukumisayo alukhuphuki ne-ADC, ngeke luphumelele ekuthuthukiseni ikhwalithi yesithombe.
Njengoba ubuchwepheshe bedijithali buqhubeka nokuthuthukisa, ngakho-ke kuyoba khona uhla lwe-tonal olusebenzayo kanye nekhono lekhamera lokuyithatha.
Kumele kuqashelwe ukuthi kumakhamera amaningi e-DSLR, ikhono lokubamba izithombe usebenzisa noma yikuphi i-ADC ngaphezu kwe-8-bits kuzodinga ukudubula kwifomethi ye-RAW. Ama-JPG avumela kuphela isiteshi se-8-bit sedatha.