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D LOG E CURVE [1 record]

Record 1 2003-01-23

English

Subject field(s)
  • Photography
  • Radiography (Medicine)
  • Computer Graphics
OBS

H and D curve: alternative term for the D log E curve of a photographic emulsion. Devised by F. Hurter and V.C. Driffield in 1890 to display the tone reproduction characteristics of the emulsion.

Key term(s)
  • density exposure curve

French

Domaine(s)
  • Photographie
  • Radiographie (Médecine)
  • Infographie
DEF

Courbe caractéristique de la sensibilité d'une couche photographique, obtenue en portant en abscisses les logarithmes décimaux des luminations et, en ordonnées, les densités optiques correspondantes. [Définition normalisée par l'AFNOR et reproduite avec son autorisation.]

OBS

On distingue généralement sur la courbe sensitométrique, trois parties : a) la courbure inférieure, ou pied, b) la partie centrale à courbure moins accentuée, c) la courbure supérieure. [Citation reproduite avec l'autorisation de l'AFNOR.]

OBS

courbe sensitométrique : terme normalisé par l'AFNOR.

Spanish

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