Density – % Transmission (Opacity x % Transmission = 100) Density Opacity %T 0 1.0 100 0.1 1.3 80 0.2 1.6 63 0.3 2.0 50 0.4 2.5 40 0.5 3.2 32 0.6 4.0 25 0.7 5.0 20 0.8 6.3 16 0.9 8.0 13 1.0 10.0 10 1.1 13 8.0 1.2 16 6.3 1.3 20 5.0 1.4 25 4.0 1.5 32 3.2 1.6 40 2.5 1.7 50 2.0 1.8 63 1.6 1.9 80 1.3 2.0 100 1.0 2.1 130 0.8 2.2 160 0.63 2.3 200 0.5 2.4 250 0.4 2.5 320 0.32 2.6 400 0.25 2.7 500 0.2 2.8 630 0.16 2.9 800 0.13 3.0 1000 0.1 D = log 1/T and T = 10-D where D = Density and T = Transmission