Gradationskurve,Schwaerzungskurve,photographische Schwaerzungskurve /SCIENCE/
[DE] Gradationskurve; Schwaerzungskurve; photographische Schwaerzungskurve
[EN] H and D curve; Hurter and Driffield curve; characteristic curve; d/log e curve; density curve; gradation curve; sensitometric curve
[FR] courbe caracteristique; courbe de Hurter et Driffield; courbe de gradation; courbe de noircissement; courbe sensitometrique; densitogramme