Process control for photographic processing apparatus

G - Physics – 03 – C

Patent

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G03C 5/02 (2006.01) G03D 13/00 (2006.01)

Patent

CA 2102135

A method of controlling photographic processing apparatus when processing a given photographic material using the characteristic curve for that material, the characteristic curve being determined from a control strip of the photographic material, the control strip being produced exposing the control strip to a step wedge, and processing the exposed strip in the processing apparatus to be controlled, the characteristic curve being determined by measuring density values from the processed control strip in relation to the exposure applied to the strip in the step wedge, and plotting these density in relation to the exposure, characterized in that the characteristic curve is defined by: D = Ds/[1+((Ei/E}.beta.)/.alpha.].alpha. where E is the exposure, D is the density at exposure E, Ei is the exposure at the point of inflexion of the curve, Ds is the density at saturation, and .alpha. and .beta. are constants for the material. By this method, precise control can be exercised over photographic processes.

Cette invention concerne une méthode de contrôle d'un appareil de traitement photographique axée sur la courbe caractéristique du matériau photographique à traiter, ladite courbe étant déterminée à partir d'une bande témoin de celui-ci exposée à un coin sensitométrique discontinu. Il s'agit de traiter alors la bande témoin dans l'appareil à contrôler, la courbe caractéristique étant déterminée en mesurant les valeurs de densité de la bande témoin traitée par rapport à l'exposition de ladite bande au coin sensitométrique et en les reportant sur papier, la courbe obtenue étant définie par la relation D = Ds/[1+((Ei/E}.beta.)/.alpha.].alpha, où E représente l'exposition, D la densité à l'exposition E, Ei l'exposition au point d'inflexion de la courbe, Ds la densité à saturation, et .alpha. et .beta. des constantes du matériau. Selon cette méthode, on peut exercer un contrôle précis sur les procédés photographiques.

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