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. Author manuscript; available in PMC: 2011 Jan 1.
Published in final edited form as: J Vis. 2010 Sep 1;10(11):8. doi: 10.1167/10.11.8

Table 1.

Michelson Contrast values for five locations on the bounding contour of the targets for the three lighting and two contrast conditions. See the caption of Fig. 6 for terminology.

Background Illumination Target Back Right Front Lower Left Upper Left
Black Far Window Step Up 0.83 0.30 0.75 0.35 0.85
Step Dn 0.85 0.38 0.09 0.58 0.90
Ramp Up 0.84 0.33 0.04 0.46 0.86
Ramp Dn 0.85 0.38 0.02 0.49 0.89
Flat 0.85 0.36 0.01 0.48 0.88
Near Window Step Up 0.57 0.56 0.24 0.85 0.57
Step Dn 0.58 0.53 0.16 0.78 0.59
Ramp Up 0.54 0.60 0.00 0.86 0.53
Ramp Dn 0.56 0.56 0.08 0.83 0.58
Flat 0.55 0.59 0.03 0.85 0.56
Overhead Step Up 0.82 0.64 0.33 0.79 0.86
Step Dn 0.82 0.61 0.05 0.76 0.86
Ramp Up 0.81 0.68 0.01 0.79 0.85
Ramp Dn 0.82 0.67 0.05 0.77 0.86
Flat 0.81 0.67 0.02 0.78 0.86
Gray Far Window Step Up 0.26 0.28 0.71 0.41 0.24
Step Dn 0.32 0.23 0.10 0.18 0.32
Ramp Up 0.26 0.29 0.05 0.32 0.24
Ramp Dn 0.31 0.21 0.03 0.26 0.31
Flat 0.30 0.25 0.01 0.30 0.29
Near Window Step Up 0.10 0.29 0.18 0.42 0.01
Step Dn 0.09 0.27 0.12 0.18 0.03
Ramp Up 0.13 0.25 0.01 0.37 0.05
Ramp Dn 0.09 0.27 0.07 0.29 0.02
Flat 0.11 0.27 0.04 0.34 0.03
Overhead Step Up 0.26 0.04 0.35 0.13 0.31
Step Dn 0.26 0.04 0.04 0.01 0.28
Ramp Up 0.24 0.05 0.01 0.07 0.30
Ramp Dn 0.25 0.05 0.03 0.02 0.28
Flat 0.24 0.05 0.02 0.04 0.29