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Come controllare l’istogramma
L’istogramma visualizza la distribuzione
della luminanza, che mostra quanti pixel
di una particolare luminosità esistano
nella foto. Per visualizzare l’istogramma,
premere DISP sul tasto di controllo
(pagina 100).
Quando l’immagine ha una parte ad alta
luminosità o a bassa luminosità, quella
parte lampeggia sulla visualizzazione
dell’istogramma (avvertimento del limite
di luminanza).
La compensazione dell’esposizione
modifica l’istogramma di conseguenza.
L’illustrazione a destra rappresenta un
esempio.
Riprendendo con la compensazione
dell’esposizione dal lato positivo si
schiarisce l’immagine nel complesso,
facendo spostare l’intero istogramma
verso il lato luminoso (lato destro). Se la
compensazione dell’esposizione viene
applicata sul lato negativo, l’istogramma
si sposta verso l’altro lato.
Entrambe le estremità dell’istogramma
mostrano una porzione ad alta luminosità
o a bassa luminosità. È impossibile
recuperare quest’area con un computer in
un secondo momento. Regolare
l’esposizione, se necessario, e ripetere lo
scatto.
Numero di pixel
Scuro Chiaro
Luminanza
R (rosso)
G (verde) B (blu)
Lampeggiante
274


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