22/05/13Umthamo ogcweleyo opheleleyo sisixa sesiginali echongiweyo ukuba ipixel nganye inokwamkela, imisela olona phawu luqaqambileyo olunokubonwa yikhamera ngaphambi kokuba kufikelelwe kwisaturation. Ukuba i-pixel ihlutha ngenxa yokuzalisa i-pixel kakuhle, ubukhulu bephikseli abusabhalwa ngokuchanekileyo. Umthamo ophezulu ogcweleyo wequla luyinzuzo kwizicelo ezifuna uluhlu olukhulu oluguquguqukayo.
Umzobo woku-1 ubonisa ubudlelwane phakathi komthamo ogcweleyo kunye noluhlu oluguqukayo. Umzobo 1A : Umthamo ophantsi opheleleyo wequla wenza umfanekiso ulahlekelwe ulwazi lweempawu eziqaqambileyo. Umzobo 1B : Umthamo ophezulu ogcweleyo wequla wenza umfanekiso ufumane ulwazi olupheleleyo ukusuka kubuthathaka ukuya kwiimpawu ezikhanyayo.
Xa iifotoni zibhaqwa ngexesha lokuvezwa komfanekiso, zikhupha ii-electron ngaphakathi kwesilicon, ezithi zigcinwe kwi-pixel kakuhle de kufundwe. Ipixel inenani eliphezulu leelektroni ezinokugcinwa phambi kokuba ivenkile ebonakalayo igcwale, okanye umfanekiso wedijithali ixabiso legreyscale lifikelela kubuninzi. Ngokunqwenelekayo, ixesha lokuvezwa kunye namanqanaba okukhanya kufuneka amiselwe ukuze oku kungavunyelwa ukuba kwenzeke. Nangona kunjalo, kwiimeko apho iimpawu eziphakamileyo nezisezantsi zivela kumfanekiso omnye, ukusebenzisa amaxesha okuvezwa asezantsi okanye amanqanaba okukhanya okukhanya kunokuvelisa imiqondiso ephantsi kakhulu ukuba ingabonwa okanye ilinganiswe kwiindawo ezimfiliba zomfanekiso njengoko ingxolo iphazamisana nemiqondiso ebuthathaka. Umthamo ogcweleyo wequla ophakamileyo uvumela amaxesha okuvezwa okukhulu okanye amanqanaba okukhanya ukubona iimpawu eziluzizi, ngaphandle kokugcwalisa iisignali eziphezulu. Ngolwazi oluthe vetshe ngoluhlu oluDynamic, bona icandelo le-'Dynamic Range'.
Ukuba usebenza kuphela kwiimeko zokukhanya okuphantsi, okanye ukuba uluhlu oluguquguqukayo aluyongxaki enkulu kumfanekiso wakho, umthamo ogcweleyo ogcweleyo uya kudlala indima encinci ekumiseleni iiparamitha ezifanelekileyo zekhamera. Ezinye iikhamera zineenketho ezininzi zokufunda kunye neendlela, ezibonelela ngereyithi eyahlukileyo yesakhelo, iimpawu zengxolo, kunye nomthamo opheleleyo wequla. Kwezi khamera, urhwebo-off luhlala lunokwenzeka apho amazinga aphezulu esakhelo sekhamera anokuphunyezwa ngotshintshiselwano lokunciphisa ukufikeleleka komthamo ogcweleyo wequla, olungele isantya esiphezulu, iimeko zokujonga ukukhanya okuphantsi.
