1. Color Perception How your eye/brain processes colors

2. Summary Human color vision is the result of a) light falling on three different receptors (cones), and b) manipulation and combination of the information from the receptors, called “opponent processing.” Part of the brain’s work here is in compensating for various levels of different hues, which can lead to interesting color phenomena.

3. Trichromacy of Color Vision Recall: Rods are sensitive to low light levels; cones are sensitive to colors There are three types of cones, each one of which is most responsive to a certain range of wavelengths

4. Trichromacy of Color Vision   wavelength Response

5. Trichromacy of Color Vision Your brain is aware only of the response of the photoreceptor; since there is only one type of rod, there can be no color sensitivity to brain

6. Trichromacy of Color Vision cones rods

7. Trichromacy of Color Vision What causes color blindness? One or two types of cones are missing from the retina

8. Spectral Complementaries Colors which when added together produce white light. This white light appears no differently to us than the white light made up of the entire spectrum.

9. C.I.E. Color Diagram

10. Opponent Processing Theory Psychological Primary Colors Why do Lego blocks have the colors they do? Why do we not describe a color as “reddish-green” or as “bluish- yellow?”

11. Opponent Processing Theory

12. Neural Connections - Chromatic Channels

13. S I L y - b Excitation Inhibition r - c

14. Neural Connections - Chromatic Channels

15. Colored Shadows