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On the exponents of saturation functions
Author(s) -
De Mattiello Maria L. F.
Publication year - 1987
Publication title -
color research and application
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.393
H-Index - 62
eISSN - 1520-6378
pISSN - 0361-2317
DOI - 10.1002/col.5080120607
Subject(s) - illuminance , hue , mathematics , reflectivity , saturation (graph theory) , optics , exponent , power function , orange (colour) , wavelength , physics , mathematical analysis , combinatorics , philosophy , linguistics
The effect of illuminance E and reflectance R on saturation is analyzed for six different hues: blue (460 nm), green (510), yellowish‐green (546), yellow (580), orange (600), and red (620), with illuminance and reflectance ranges of 2.4–3400 lux and 12–65 %R, respectively. The data obtained demonstrate, once again, that an increase in saturation is the result of power functions and that it is mainly the reflectance that modifies the exponent of the functions, due to the changes it produces in the appearance of colors. Illuminance, in turn, would help to increase the colorfulness of surfaces. From the results, an equal increase of the sensation of low and high illuminance levels is verified. It is observed that there are groups of functions, the exponents of which, plotted versus the corresponding wavelengths, give curves similar to the saturation thresholds, a fact showing that the threshold differences are maintained at suprathreshold levels. Finally, the part that the reflection plays on the color perception, in relation with illuminance, is discussed.