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Colour illusions in Spot 09 |
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Experimental procedure for Spot 09 Colour illusions with different degrees of scaling
Bezold effect versus assimilation effect
When playing with this spot, you can see for yourself that many shades of colour that are produced by coarse scaling with the Bezold effect are not present with fine scaling with the assimilation effect, and vice versa. If you successively increase your distance from the picture when observing the Bezold effect, the illusion automatically changes into the assimilation effect. If you increase he distance with a finely scaled picture, you soon go beyond the critical distance at which the slatted structure vanishes completely. The lights from the various colour elements then overlap one another on the retina. When this happens, we talk of an optical or proportionate colour mix [3]. Good examples of this are to be found on the colourful wings of butterflies, which are transformed under the microscope into structured entities with tegulae in a variety of colours. Bibliography:
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| 07/11/2003 | ||
curtain in the foreground can be closed again by means of the upper slider. The left and right buttons can be used to change the colour of the two sections. The curtain slats grow longer like a telescope when the curtain is closed and finally mesh together without overlapping. Apart from black and white, only three colours are involved, which are layered horizontally in different combinations and which conjure up special harmonies of colour of the kind we have been aware of in painting since the discoveries of the pointillists (Georges Seurat, Paul Signac). Coloured dots are replaced here by lines. The lower slider adjusts the scale (width of the slats), which has a considerable effect on the play of colours