notebook with photometric data
Date: 1987
Inventory Number: 2004-1-0214e
Classification: Notebook
Subject:
Maker: Edwin H. Land (1909 - 1991)
Cultural Region:
Place of Origin:
Dimensions:
8 x 29 x 30 cm (3 1/8 x 11 7/16 x 11 13/16 in.)
DescriptionTogether 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.
Some of the data in the binders also come from Mach bands experiments, which were done, for instance, with 2004-1-0115.
In Collection(s)
Signedunsigned
FunctionUsed by Land for his experiments with color vision (Retinex theory).
Curatorial RemarksThis notebook is now located in the CHSI library, C4-I drawer 1.
Primary SourcesEdwin H. Land, "The Retinex Theory of Color Vision," Scientific American 237 (1977): 108-128.
Edwin H. Land, "Recent Advances in Retinex Theory and Some Implications for Cortical Computations: Color Vision and the Natural Image," Proceedings of the National Academy of Sciences of the United States of America 80 (1983): 5163-5169.
Edwin H. Land, "An Alternative Technique for the Computation of the Designator in the Retinex Theory of Color Vision," Proceedings of the National Academy of Sciences of the United States of America 83 (1986): 3078-3080.
Edwin H. Land, "Recent Advances in Retinex Theory and Some Implications for Cortical Computations: Color Vision and the Natural Image," Proceedings of the National Academy of Sciences of the United States of America 80 (1983): 5163-5169.
Edwin H. Land, "An Alternative Technique for the Computation of the Designator in the Retinex Theory of Color Vision," Proceedings of the National Academy of Sciences of the United States of America 83 (1986): 3078-3080.
ProvenanceThis object belonged to Edwin H. Land and came from the Rowland Institute, Harvard University. Gift of the Edwin H. Land Family.