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RAW
Le format RAW d’une image correspond à l’information brute telle qu’elle provient
du capteur. Il ne comporte aucun traitement par l’appareil avant le transfert des
données vers l’ordinateur.
Sensibilité ISO
Le terme ISOInternational Organization for Standardizationfait référence aux
valeurs normalisées assignées aux films pour exprimer leur sensibilité à la
lumière, une valeur élevée correspondant à une sensibilité élevée, et vice versa.
Les appareils photo numériques utilisent cette norme pour exprimer le réglage de
la sensibilité.
Température de couleur
Il s'agit de l'expression quantitative de la tonalité de la lumière émise par une
source lumineuse. L'unité de mesure est le degré Kelvin (K). La lumière du jour
ensoleillée est proche de 5600 K. Les basses valeurs de températures sont plus
chaudes avec davantage de jaune et de rouge, alors que les hautes valeurs
correspondent à une lumière bleutée plus froide. La température d'un éclairage
au tungstène est de 3200 K, celle d'un moniteur PC de 9300 K.
Vitesse d’obturation
Lobturateur du boîtier s’ouvre durant une durée particulière afin de contrôler la
quantité de lumière qui parvient à la surface photosensible. Cette durée durant
laquelle l’obturateur est ouvert et permet à la lumière de pénétrer dans le capteur
est appelée vitesse d’obturation.
122


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