Abstract
Two paintings, O1 and O2, were split into their luminance (grayscale) components L1, L2 and their color components C1, C2. The two color components, C1, C2, were transparently superimposed. Adding the grayscale of the first painting (= C1 + C2 + L1) looked like the original O1, while adding the grayscale of the second painting (= C1 + C2 + L2) looked like the original O2. Conclusion: the luminance contours selected or gated the congruent color contours and ignored non-congruent colors from the other painting.
Highlights
This note describes how colored borders that are barely visible can be made prominent by adding congruent luminance edges
But color perception is fuzzier owing to different receptive field sizes for neurons coding for luminance and color, respectively (Wandell, 1995)
Usually colored borders coincide with luminance edges, various studies have reported a loss of color-form coherence
Summary
This note describes how colored borders that are barely visible can be made prominent by adding congruent luminance edges. When images are retinally stabilized, colors can lose their alignment with the contours of the shapes (Gerrits, de Haan, & Vendrik, 1966). The Boynton illusion is another clear example of the dominant role luminance plays in shape perception.
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