Related Object Info
notebook with photometric data
Together with 2004-1-0214d and f, this binder is filled with spectrophotometer plots dated from June 1987 to December 1987. Data come from the Spectra Pritchard Photometer, 2004-1-0214a and from a computer algorithm. There are usually three types of graphs called "numerator", "denominator" and "designator". The designator graph is the result of a calculation from a special algorithm based on the other two graphs. The first two graphs are the "physical" data as perceived by the photometer. The designator graph represents the Retinex model of color perception as the brain would see it. The designator, therefore, is a calculation based on a model of perception, Retinex, which got more refined over the years. The designator graph is different from the other two "real" (in physics' terms) color graphs because it is designed to illustrate how color is perceived by the brain.
Some of the data in the binders also come from Mach bands experiments, which were done, for instance, with 2004-1-0115.