Effects of surround/test field luminance ratio on induced colour

Abstract

Abstract.— According to Kirschmann's third law the induced colour is at its maximum when the inducing and induced fields are of equal luminance. Later studies (Kinney, 1962) show the induced colour to be most pronounced at a luminance ratio (inducing/induced) of about 4/1. In the present study the amount of colour induced into an achromatic test field was determined for one inducing colour, red, by letting observers judge the colour strength of the induced field. The test (or induced) field luminance was varied to give luminance ratios between 0.5/1 and 2/1. The results show that both colour strength and blackness increase as the luminance ratio is increased. The fact that the test field was judged even to have maximum chromatic colour strength and maximum blackness at the same time is discussed in relation to the method used and in relation to earlier studies on the “mode of appearance” of colours and the bidimensionality of achromatic colours.

Recognized visual space of illumination: No simultaneous color contrast effect on light source colors

“…However, it is not known what determines this critical luminance level. 9,10 The present results suggest that the RVSI could be the determinant. Under the fourth condition, however, L T-noSCC clearly departs from L T-ls .…”

Chromatic induction as a function of luminance relations

“…The purpose of the present investigation was to study the chromatic component of the induced colour as a function of surroundltest field luminance ratio. In an earlier study (Bergstrom & Derefeldt, 1975) colour strength was found to increase as the luminance ratio was increased from 0.5 to 2.0. These results support the data of Kinney (1962) but are contradictory to Kirschmann's (1890) third law stating that induced colour is most prominent when brightness contrast is excluded or reduced to a minimum.…”

“…The results show maximum induction to appear at a luminance ratio around 1 .O when varying the test field luminance (Experiment 1) and at higher ratios when varying the surrounding luminance (Experiments 2 and 3). This difference is discussed in relation to the Kirschmann-Kinney controversy (Kirschmann, 1890; Kinney, 1962) and in relation to an earlief study using a magnitude estimation method (Bergstrom & Derefeldt, 1975).…”

Hue shift of induced colour as a function of luminance relations

“…when the surround was much brighter than the test field, our subjects sometimes described the induced colour with references to the colour seen in a smut or in a softly textile as well as to a luminous blackish flashlight, if, as they expressed it, "such a thing did exist". In an earlier study (Bergstrom & Derefeldt, 1975) our subjects reported a high degree of chromaticness together with a high degree of blackness. The chromatic colour was then perceived as a surface colour seen through a blackish film.…”

“…It is concluded that the hue shifts depend on the luminance relations rather than on the test field luminance. In an earlier study on the colour induced into a neutral test field (Bergstrom & Derefeldt, 1975) the subjects spontaneously reported hue shifts when the surround/test field luminance ratio was varied. For a red surround the hue of the induced colour became bluish green with an increase of test field luminance and more pure green with a decrease of luminance.…”