Stiles' threshold-versus-intensity (t.v.i.) template curve

Data key

Columns

1. Log relative background intensity, log(x)
2. Log relative increment threshold, log[z(x)]

Notes

From Table A of Stiles (1978). See also Table 1(7.4.3) of Wyszecki & Stiles (1982).

For log x > 0.5, log[z(x)] = -0.94 - log(x).

This function defines the average shape of the t.v.i. curve of an individual foveal color (or p) mechanism.

References

Stiles, W. S. (1978). Mechanisms of Colour Vision. London: Academic.

Wyszecki, G., & Stiles, W. S. (1982). Color Science: concepts and methods, quantitative data and formulae. (2nd ed.). New York: Wiley.

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