Ukusetha Kokukhanya Okuzenzakalelayo Kwekhamera Yedijithali
Esikhathini sokuthwebula izithombe zedijithali, amakhamera awasewona nje ama-recorder ezithombe; asebenza futhi “njengamakhompyutha amancane” ahlaziya ukukhanya njalo. Esinye isici esivame ukunganakwa abasebenzisi ukulungiselelwa kokukhanya okuzenzakalelayo. Lesi sici sisiza amakhamera ukuthi akhiqize izithombe ezikhanyayo, okulula ukuzifunda, kungaba ukuthwebula ngaphansi kwelanga elikhanyayo, emakamelweni akhanya kancane, noma ezimweni zokukhanya okuxubile njengekhefi elikhanyayo. Kodwa-ke, ngemuva kwalokhu kulula kunezinqubo eziningi zobuchwepheshe ezithakazelisayo: ikhamera ilinganisa ukukhanya, inquma ukuvezwa, ilungisa amapharamitha, futhi yenza ngisho nokucubungula okwengeziwe ngemva kokuthathwa kwesithombe. Lesi sihloko sixoxa ngendlela ukulungiselelwa kokukhanya okuzenzakalelayo okusebenza ngayo, izinzuzo zako, imikhawulo yako, nokuthi ungazuza kanjani kukho ngokugcwele.
Kuyini Ukukhanya Okuzenzakalelayo?
Ukukhanya esithombeni ngokuvamile kubhekisela ekukhanyeni noma ebumnyameni besithombe, okuhlobene kakhulu nomqondo wokuvezwa. Ukukhanya okuzenzakalelayo kuyindlela yekhamera elungisa ngokuzenzakalelayo ukuvezwa ukuze ivimbele isithombe ekubeni mnyama kakhulu (singabonakali kahle) noma sikhanye kakhulu (singabonakali kakhulu). Empeleni, ikhamera inquma inhlanganisela yamapharamitha abalulekile anjengalawa:
1. Imbobo (ukuvulwa kwelensi): ubukhulu bembobo obuthinta inani lokukhanya okungenayo kanye nokujula kwensimu.
2. Isivinini se-Shutter: ubude besikhathi inzwa ethola ukukhanya; kuthinta umphumela wokufiphala kokunyakaza.
3. I-ISO: ukuzwela kwenzwa ekukhanyeni; uma i-ISO iphakeme, isithombe sikhanya kakhulu kodwa umsindo uyanda.
Lezi zinto ezintathu zaziwa ngokuthi unxantathu wokuchayeka. Uma umsebenzisi ekhetha imodi ezenzakalelayo noma ezenzakalelayo, ikhamera izolungisa eyodwa noma ngaphezulu yalezi pharamitha ukuze kufezwe ukukhanya okufiswayo.
Ikhamera Ilinganisa Kanjani Ukukhanya?
Ukuze kulungiswe ukukhanya, ikhamera kumele iqale ilinganise ukukhanya okungenayo. Le nqubo yenziwa ngohlelo lokulinganisa. Kunezinhlobo eziningana ezivamile zokulinganisa:
– Ukulinganisa Okulinganiselwe/I-Matrix: ikhamera ihlukanisa uhlaka lube yizindawo eziningi, ihlaziya indawo ngayinye, bese iphetha ukuvezwa okungcono kakhulu ngokusekelwe ku-algorithm.
– Ukulinganisa Okunesisindo Esimaphakathi: ikhamera ibeka phambili indawo ephakathi yohlaka.
– Ukulinganisa Amabala: Ikhamera ilinganisa ukukhanya endaweni encane (ngokuvamile ilandela indawo egxile kuyo). Ifanele izimo ezihlukile kakhulu, njengesihloko esiphambi kwefasitela.
Ngemva kokulinganisa ukukhanya, ikhamera yenza umcabango obalulekile: izinhlelo eziningi zokulinganisa zibheka indawo "ejwayelekile" njengelingana no-18% ompunga (ompunga ophakathi nendawo). Lokhu kusho ukuthi ikhamera izama ukwenza umphumela wokugcina ungakhanyi kakhulu noma umnyama kakhulu ngaleyo ndlela. Yingakho izinto ezimhlophe (iqhwa, izingubo ezimhlophe) zivame ukubonakala zibuthuntu uma zishiywa ku-full auto, kuyilapho izinto ezimnyama ngezinye izikhathi zibonakala zikhanya kakhulu: ikhamera izama ukudonsa konke phansi kube "ompunga ophakathi nendawo."
Indima Yokuchayeka Emotweni (i-AE) kanye Nesinxephezelo Sokuchayeka
Ukulungiswa kokukhanya okuzenzakalelayo kuvame ukubizwa ngokuthi i-Auto Exposure (AE). Kumodi ye-Auto, ikhamera inquma wonke amapharamitha okuchayeka. Kumodi ye-semi-automatic, amanye amapharamitha angakhethwa ngumsebenzisi:
– I-Aperture Priority (A/Av): umsebenzisi ukhetha i-aperture, ikhamera isetha isivinini se-shutter kanye/noma i-ISO ukuze kutholakale ukukhanya okulungile.
– I-Shutter Priority (S/Tv): umsebenzisi ukhetha isivinini se-shutter, ikhamera ilungisa i-aperture kanye/noma i-ISO.
– Uhlelo (P): ikhamera ikhetha inhlanganisela yokuvula kanye nesivinini sokushutha, umsebenzisi usengakwazi ukushintsha inhlanganisela (ukushintsha kohlelo) bese esetha i-ISO noma isinxephezelo.
Uma umphumela ukhanya kakhulu noma umnyama, umsebenzisi angasebenzisa i-Exposure Compensation (EV). Isibonelo:
– Isithombe seqhwa sibukeka singathandeki → engeza i-+1 EV noma i-+2 EV ukuze ugcine umhlophe umhlophe.
– Isithombe sesiteji sekhonsathi sikhanya kakhulu ngenxa yokukhanya okukhanyayo → ukunciphisa i-EV engu--1 ukuze imininingwane evelele ingalahleki.
Isinxephezelo sokuvezwa kuyindlela "yokulungisa" isinqumo sokukhanya okuzenzakalelayo ngaphandle kokushintshela kwimodi yokwenziwa ngesandla.
I-ISO Ezenzakalelayo: Ukukhanya Okuzenzakalelayo Okuguquguqukayo
Isici esithinta kakhulu ukukhanya okuzenzakalelayo yi-Auto ISO. Uma i-Auto ISO isebenza, ikhamera ingaphakamisa noma yehlise i-ISO ngokukhululeka ukuze ifinyelele ukuvezwa okufiselekayo, ikakhulukazi uma umsebenzisi evala i-aperture nesivinini se-shutter. Lokhu kuwusizo ezimweni zokukhanya ezishintsha ngokushesha, njengemicimbi yangaphakathi, ezemidlalo, noma izithombe zasemgwaqweni.
Noma kunjalo, i-Auto ISO inemiphumela:
– I-ISO ephezulu inyusa umsindo futhi inciphisa imininingwane.
– Kwamanye amakhamera, i-Auto ISO ingaba “nolaka kakhulu” ekunyuseni i-ISO yize isivinini se-shutter sisengancishiswa kancane.
Isixazululo esiwusizo ukusebenzisa ukusethwa komkhawulo we-ISO (umkhawulo we-ISO ophezulu) kanye nesivinini esincane sokushutha (isivinini esincane sokushutha) uma ikhamera ikunikeza, ukuze ikhwalithi igcinwe.
I-HDR, i-Dynamic Range, kanye nokukhanya "kokuzizwa"
Ukukhanya kwesithombe akunqunywanga nje kuphela ngesikhathi sokuthwebula kodwa futhi nangemva kwalokho ngokucubungula izithombe. Amakhamera esimanje, ikakhulukazi ama-smartphone kanye namakhamera angenazibuko akamuva, avame ukuthembela kumasu anjengalawa:
– I-Auto HDR: ihlanganisa ukudalulwa okuningi ukuze kulondolozwe imininingwane ezindaweni ezimnyama nezikhanyayo.
– Ukuvuselelwa Kokugqama/Umthunzi: kuphakamisa izithunzi noma kubamba izindawo ezikhanyayo (okugqama) ukuze "zingaphuki".
– Ukuhlela Amathoni: kulungisa ijika lethoni ukuze isithombe sibonakale “silinganisele” kakhulu emehlweni.
Lokhu kuchaza ukuthi kungani amakhamera amabili engathwebula indawo efanayo enezinombolo ezifanayo zokuvezwa, kodwa akhiqize ukukhanya okuhluke kakhulu: ukucubungula kwangaphakathi kanye nesitayela sesithombe kudlala indima.
Izinselele Ezivamile Zezilungiselelo Zokukhanya Okuzenzakalelayo
Naphezu kobuchwepheshe bayo, izici ezizenzakalelayo zisenemikhawulo. Ezinye izimo ezivame ukukhubeka ngamakhamera zifaka:
1. Isibani sangemuva (ukukhanya okuvela ngemuva kwento esetshenziswayo)
Isihloko siba yisithunzi ngoba ikhamera ibeka phambili ingemuva elikhanyayo. Isixazululo: Sebenzisa imitha yamabala ebusweni, vumela ukutholwa kobuso, noma wandise i-EV.
2. Izigcawu zimhlophe kakhulu noma zimnyama
Njengeqhwa, amabhishi, noma izitudiyo ezinesizinda esimnyama, amakhamera avame ukwenza isithombe sibe mpunga. Isixazululo: sebenzisa isinxephezelo sokuvezwa.
3. Umehluko omkhulu
Isibonelo: Ingaphakathi legumbi elinefasitela elikhanyayo. Ikhamera ikhetha enye yezinketho ezimbili: ukulondoloza imininingwane yefasitela kodwa ifiphaze ingaphakathi, noma okuphambene nalokho. Isixazululo: i-HDR, ukufaka amabhuleki, noma ukusebenzisa i-flash/reflector.
4. Isihloko sihamba endaweni emnyama
Ikhamera ingakhuphula i-ISO noma yehlise isivinini se-shutter, okuholela ekufiphaleni. Isixazululo: Setha isivinini se-shutter esincane noma sebenzisa imodi yokubeka phambili i-shutter.
Amathiphu Okuthuthukisa Ukukhanya Okuzenzakalelayo
Ukuze uthole imiphumela yezithombe ehambisanayo, ungasebenzisa lezi zinyathelo ezilandelayo:
– Sebenzisa imodi ezenzakalelayo (A/Av noma S/Tv) ukuze ikuvumele ulawule umphumela wobuciko, kuyilapho ikhamera inakekela ukukhanya okuyisisekelo.
– Nika amandla i-Auto ISO enomkhawulo. Setha i-ISO ephezulu ngokuya ngokubekezelela umsindo kwekhamera yakho, isibonelo, i-ISO 3200 noma i-6400.
– Jwayela ukusebenzisa isinxephezelo se-EV. Kuyindlela esheshayo "yokufundisa" ikhamera lokho okufunayo.
– Sebenzisa imitha efanele. I-matrix yezithombe ezijwayelekile, indawo yezimo ezinzima, isisindo esiphakathi sezithombe zakudala.
– Hlola i-histogram, uma ikhona. I-histogram ikusiza ukuthi ubone ukuthi izici ezivelele ziyasikwa (zikhanya kakhulu) noma izithunzi zicindezeleke kakhulu.
– Cabanga ngokudubula i-RAW. I-RAW inikeza isikhala esiningi sokulungisa ukukhanya kune-JPEG, ikakhulukazi ekugcineni izici ezivelele kanye nokuphakamisa izithunzi.
I-Penutup
Ukusetha ukukhanya okuzenzakalelayo kukhamera yedijithali kuyinhlanganisela yokulinganisa ukukhanya, ukubalwa kokuvezwa (i-AE), ukulungiswa konxantathu wokuvezwa (i-aperture, isivinini se-shutter, i-ISO), kanye nokucubungula okuthuthukisiwe njenge-HDR kanye nemephu yethoni. Lesi sici senza inqubo yokudubula isheshe kakhulu futhi ibe lula kakhudlwana, ikakhulukazi kwabaqalayo noma ezimweni ezishintshayo. Kodwa-ke, ukuqonda okuyisisekelo kokuthi ukukhanya okuzenzakalelayo kusebenza kanjani kuzokusiza ukuthi ulawule lapho ikhamera "ingaqondi kahle," isibonelo, ekukhanyeni kwangemuva, ikakhulukazi izigcawu ezimhlophe/ezimnyama, noma ukugqama okukhulu. Ngokusebenzisa isinxephezelo se-EV, i-Auto ISO elinganiselwe, i-auto ISO efanele, kanye namathuluzi afana ne-histogram, ungafinyelela izithombe ngokukhanya okunembe kakhudlwana ngenkathi usagcina isitayela sakho sokubuka osithandayo.
