Displays continue to evolve in numbers, specifications and applications, with many of these displays being used to access content via the World Wide Web, on telecommunications networks or using proprietary content services. This paper uses an experimental technique to estimate the “gamma” for displays on the World Wide Web. A lightness partitioning experiment was performed by 404 volunteers on the World Wide Web and the resulting data was analyzed to estimate a relationship between lightness and display values. While there are many uncontrolled variables and sources of uncertainty, robust non-parametric statistical analysis results in very low standard errors. The fitted function has an offset for the black point, but the remainder of the lightness versus display digital count data is well fit with a linear function. Overall the data is well fit with an offset of about −0.04 and a gamma of roughly 2.36.