Figure 1. The Hurter and Driffield (H&D) curves (optical density vs log relative exposure) under different processing conditions: (a) MR5-II (Agfa), (b) HT (Agfa), (c) HDR (Agfa), (d) MinR-M (Kodak), (e) MinR-2000 (Kodak), (f) AD-M (Fuji), (g) Konica (CM-H). The optical densities (ODs) of the 21 steps of the sensitometric strips correspond to log relative exposure values (LogE) that range from 0 to 3, in steps of 0.15 each. In these figures only the ODs for LogE
ge;0.9 (steps 7 to 21) are presented in order to enhance the visibility of the differences in the linear part and the shoulder of the H&D curves.