Color Perception

1. Color Perception How your eye/brain processes colors

2. Newton’s Color Circle

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 l 2 Response l 1 wavelength

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 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. Other Non-spectral Colors Red = 250 Green = 250 Blue = 0 Red = 125 Green = 125 Blue = 0

11. Other Non-spectral Colors Red = 254 Green = 120 Blue = 20 Red = 125 Green = 60 Blue = 10

12. 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?”

13. Opponent Processing Theory

14. Neural Connections - Chromatic Channels

15. Neural Connections - Chromatic Channels L I S Inhibition Excitation y - b r - c

16. Neural Connections - Chromatic Channels

17. Colored Shadows

18. Colored Shadows

19. Colored Shadows

20. Colored Shadows

21. Colored Shadows