Chifukwa Chake Muyenera Kusamalira ADC Yanu
ADC imayimira Analog to Digital Converter ndipo imatanthawuza kuti kamera ya digito imatha kutenga chowonadi ndikusintha kukhala fayilo ya digito. Njirayi imatengera mtundu wonse, zosiyana, ndi zidziwitso za tonal zomwe zimachitika pazithunzi ndikuziyikira ku dziko ladijito pogwiritsira ntchito kachidindo kakang'ono ka makina onse a makompyuta.
Makamera onse a digito amapatsidwa chiwerengero cha ADC ndipo amapatsidwa mwachindunji zamakono zazomwe amapanga. Ndikofunika kumvetsetsa kuti ADC ndi yeniyeni, momwe ikugwirira ntchito, ndi chifukwa chake ikhoza kugwira ntchito mugulidwe kamera kamotsatira.
ADC ndi chiyani?
DSLR yonse ndi mfundo ndi kuwombera makamera ali ndi masensa omwe ali ndi mapikseli ndi photodiodes . Izi zimatembenuza mphamvu ya mafoto mu magetsi. Mlanduwu umasinthidwa kukhala mpweya, womwe umatambasulidwa pamlingo umene ungagwiritsidwe ntchito ndi kamera ya digito ya Analog to Digital Converter (yotchedwa ADC, AD Converter, ndi A / D Converter kwaifupi).
ADC ndi chipangizo mkati mwa kamera yanu yadijitoli ndipo ntchito yake ndiyoyesa kugawa ma pixel kuti mukhale owala ndi kuyika mlingo uliwonse ku nambala yowonjezera, yokhala ndi zeros ndi zina. Makamera ambiri ogwiritsira ntchito ogwiritsa ntchito amagwiritsa ntchito osachepera 8-bit ADC, yomwe imalola kuti zifike pa 256 malingana ndi kuwala kwa pixel imodzi.
Kusankha ADC ya Digital Camera
Kuchuluka kwapang'ono kwa chiwerengero cha ADC kumatsimikiziridwa ndi kukula kwakukulu (kulondola) kwa sensa . Kukula kwakukulu kofunikira kudzafunikira osachepera 10-bit ADC kuti apange tankhulo zambiri ndikupewa kutayika konse kwa chidziwitso.
Komabe, opanga makamera kawirikawiri amatchula ADC (monga ma bits 12 mmalo mwa 10 bits) kuti alolere zolakwika zilizonse pa izo. Zowonjezera "bits" zingathandizenso kuteteza banding (kutumizira pambuyo) pamene mukugwiritsa ntchito tonal curves ku deta. Komabe, sangawononge zambiri za tonal, kupatula phokoso.
Kodi Izi Zikutanthauza Chiyani Pogula Kamera Yatsopano?
Tanena kale kuti makamera ambiri ogwiritsira ntchito makompyuta ali ndi ADC 8-bit ndipo izi ndi zokwanira kwa amateurs omwe amajambula zithunzi za banja kapena kulanda dzuwa lokongola. ADC imakhala ndi ntchito yaikulu ndi makamera apamwamba a DSLR pamakampani komanso apamwamba.
DSLRs ambiri amatha kugwira ndi ADC apamwamba monga 10-bit, 12-bit, ndi 14-bit. Ma ADC apamwambawa apangidwa kuti apangitse miyezo yodalirika imene kamera ikhoza kugwira, kupanga mithunzi yakuya ndi zosavuta.
Kusiyanitsa pakati pajambula 12-bit ndi 14-bit kudzakhala kochepa kwambiri ndipo sikungakhale kosadziŵika m'zojambula zambiri. Ndiponso, zonsezi zidzadalira pa kukula kwake kwa mphamvu yanu. Ngati kukula kwake sikukulirakulira ndi ADC, ndiye kuti sikungatheke kusintha khalidwe la zithunzi.
Monga momwe zipangizo zamakono zamakono zikupitilira, momwemonso chithunzi chogwira ntchito cha tonal komanso kamera kamatha kuchigwira.
Tiyeneranso kukumbukira kuti mu makamera ambiri a DSLR, kuthetsa zithunzi pogwiritsa ntchito ADC pamwamba pa 8-bits kumafuna kuwombera mu mawonekedwe a RAW. JPGs amalola kokha kanema ka 8-bit ya deta.