Chromatic Adaptation and Surface Colour Constancy

After some hesitation I submit this video lecture, bringing up an intricate topic.
On the one hand, object colour constancy is just a simple matter of fact. On the other hand, as soon as you think about it from a technical point of view, it is quite intriguing.
I strongly advice you to take look at the written version, especially the supplementary notes, at the end! Find it at pscolour.eu/eg...
I also suggest that you consult my previous video on Edwin H Land's Two-Colour Projections
• Two-colour projections... as well as the one dealing with "Ideal Colours" • Ideal colours - what i...

[@audiolivrobom]

Thank you, sir, for these invaluable videos you produce.

[@ineffable500]

I have so greatly enjoyed your atmospheric, astonishing videos! thank you very much, and I am astonished by the questions about light especially related to the rays of purple (i.e. that purple/magenta has no wavelength on the Newtonian spectrum, yet you can produce a "monochromatic" ray of purple in your experimental setup). Have you seen Gopi Krishna Vijaya's paper from 2020 entitled Colour, Wavelength and Turbidity in the Light of Goethe’s Colour Studies ?